Realizing that Tsuna and his friends need to become stronger before facing Byakuran, Reborn arranges for Spanner to send them, along with Yuni, back to the past. As they arrive, the day after they completed the Arcobaleno trials, they are met by the other Arcobaleno, who Reborn has called together to train Tsuna and co. Yuni uses her powers to activate Tsuna's Vongola ring, bringing forth the image of the Vongola First. He tells Tsuna and his guardians that the Vongola guardians of the first generation will determine whether Tsuna and his guardians deserve to inherit the real power of the Vongola before leaving. Reborn explains that the First's guardians will appear from the ring to test their respective successors. He then assigns Tsuna and his guardians Arcobalenos respective to their elements train them. That night, the First Generation Guardians appear from the rings of Tsuna's guardians and announce to their respective successors they will be observing their actions henceforth.

While Tsuna and his family are observed by their respective Arcobaleno tutors, Collenello notices that Yamamoto is visibly disturbed by something. The First Generation Rain Guardian, Ugetsu Asari, appears in front of Yamamoto and announces that his trial will take part that night at Namimori Shrine. Yamamoto meets Ugetsu and begins their trial. Yamamoto, blaming himself for their loss in the battle of Choice, fights Ugetsu in an aggressive manner and seemingly defeats him. However, Ugetsu announces that Yamamoto has failed the trial, saying that he is unworthy to inherit his power in his current state.

Ugetsu tells Yamamoto he will give him a second chance at the trial the next night and disappears. The next day, Yuni transfers into Tsuna's school, whilst Tsuna and his friends attempt to find out why Yamamoto failed his trial. Meanwhile, Kyoko and Haru visit Chrome only to find out from Ken and Chikusa that she has been missing since the day they returned from the future. That night, after talking with his father, Yamamoto arrives at the shrine where Tsuna tells him to not push himself. Yamamoto and Ugetsu engage in battle and Yamamoto prepares to deliver the finishing blow but suddenly stops as he remembers his father's and Tsuna's words. Ugetsu declares that Yamamoto has passed the trial and explains that Yamamoto failed the trial last time because he attempted to betray his heart and kill a person. Before leaving, he tells Yamamoto the Rain Guardian must not run dry and must keep his friends together.

Lampo appears before Tsuna and the sleeping Lambo and announces that Lambo's trial will take place at an amusement park. To pass Lampo's trial, Lambo has to gather three stamps by riding three amusement park rides and enter the castle which Lampo resides. The rides are the teacups, a miniature race track, and a course through a robot museum. While going through the rides, Verde hacks into the amusement park systems in order to perform various tests on Lambo and to deduce why Lambo has such a high resistance to electricity. After Verde captures Lambo with a robot, Lambo's fear causes him to release all the electricity Verde shocked him with and which causes an explosion destroying Verde's robot and sends Tsuna and Lambo into castle. Lampo initially deems Lambo has failed the trial since Tsuna missed stamping the paper but decides to pass Lambo after seeing the electricity Lambo released.

Gokudera, impatient with the trials, begins training at the park early in the morning. While Gokudera is busy looking for Uri who runs away, G disguises himself as Gokudera with Fong buy some times for him. At school, Tsuna and his friends notice that Gokudera has been calmer and more reliable than usual, which arouses Tsuna's suspicion. While walking home, Tsuna and Gokudera run into the real Gokudera who reveals that G has been impersonating him. G reveals himself and asks Tsuna how his performance was at school. Tsuna comments that G has been reliable and helpful, which causes G to denounce Gokudera as being unsuitable to be Tsuna's Right Hand man and deems him unworthy of being the Storm Guardian. When G demands Gokudera to return the Vongola Ring and leave Japan, Tsuna defends Gokudera stating that Gokudera is not supposed to be his Right-Hand man but his friend. G then reveals that his trial was to test Tsuna and Gokudera's bond and deems him worthy of the Guardian of Storm.

Hibari's trial does not involve combat which causes Hibari to lose interest. Alaude, the First Cloud Guardian, tells Hibari he must demonstrate his worth as the Cloud Guardian to pass his trial and he has a day to complete it. While Tsuna and his friends try to persuade Hibari to take the trial to no avail, leaving only Ryohei to persuade him. During Ryohei's persistent way of persuading Hibari, Skull appears with a blimp and attempts to force Hibari to take the trial by attacking him. Hibari damages the blimp which causes it to begin its descent on the school.

Ryohei manages to destroy the blimp before it crashes into the school. Skull, enraged by the two, continues his attack on the school but is soon defeated by Hibari. Soon after, the First Sun Guardian, Knuckle, allows Ryohei to pass his trial after witnessing his extreme optimism for the day and how he defeated the blimp without fear in order to protect his friends and finally able to convince Hibari to take trial, something that no one able to achieve. Alaude then makes his appearance and announces Hibari has passed his trial as the Cloud Guardian by indirectly protecting the family without fraternizing with them. At Kokuyo Land, Chrome finally returns to her hideout and collapses in tears in front of Ken and Chikusa. While discussing Chrome, Tsuna and co decide to go to Kokuyo Land in case Chrome returns. Outside Tsuna's house, the First Mist Guardian, Daemon Spade, comments that Tsuna is unfit to become Vongola Boss like Vongola Primo once was.

Tsuna and his friends are visiting Chrome when they run into Ken and Chikusa who tells them Chrome's strange behavior. They discover that Chrome has completely terrified of something, leading Kyoko, Haru, I-Pin, and Yuni to stay with Chrome until she calms down while Tsuna and the rest go back. Reborn holds a meeting with other Arcobaleno regarding Chrome's sudden change and deduce that it was connected to the First Mist Guardian, Daemon Spade. In the afternoon, Reborn gathers the Arcobalenos and Tsuna's guardians to meet with Chrome once again for the inheritance. However, Daemon Spade appears and traps the Chrome along with the other girls in the building and declares Tsuna is unfit to be the Vongola Tenth.

Daemon Spade reveals that he had been controlling Chrome to draw them out and tells Tsuna and his friends that he will now be testing them all on his own terms in order to turn them into his idea version of the Vongola Family. Tsuna and his friends enter the building and are then separated and confronted by a dark version of themselves created by Daemon. While the dark versions gain the upper hand, Daemon tells Yamamoto that he must kill his double, while simultaneously tells Ryohei to be merciless in battle and abandon Lambo in order to win, and taunts Tsuna and Gokudera that Tsuna is not worth to be protected.

Tsuna and his friends continue to battle their respective counterparts. Daemon tries to convince them to become cruel and merciless, but Tsuna and his friends stay true to their convictions and refuses to become the people that Daemon want. During their fight, Daemon reveals to Tsuna that he was the one who caused Primo to flee to Japan in order to have the Vongola be ruled under a more suitable boss since he deemed Primo to be too soft. Fong and Collonelo called Verde and Mammon for their cooperation while Skull bring Hibari to Kokuyo Land by stealing his armband. Once the Arcobaleno has gathered, they able to disperse Daemon's illusionary space with their combined efforts. However, despite the sudden outcome, Daemon refuse to back down and decide to be serious to continue their battle.

Daemon engages Tsuna alone in battle and traps him in an illusion and tricks Tsuna into firing an X-Burner at where Kyoko, Haru, Yuni, I-Pin, and Chrome are. Mukuro quickly takes over Chrome, averts the attack, and disperses the illusion allowing Tsuna to defeat Daemon. Daemon, convinced he is unable to change the Tsuna and his friends, gives up on changing them. Instead, he begins to questions Mukuro and deems him worthy as the Mist Guardian and allows him to pass the trial as he sees Mukuro much more promising than the other guardians. At that moment, Primo appears and declares Tsuna to be worthy to be the Tenth Vongola Boss after observing his every actions and also passes him. The First Generation of the Vongola Family then return their consciousness to the Vongola Rings and so does the remaining Arcobaleno. The next day, Tsuna and his friends gather at the Namimori Shrine where they are then sent back to the future by Spanner.

Reborn recaps the events that took place in the past to Lal Mirch and the inheritance trials Tsuna and his family went through.

The Real 6 Funeral Wreaths arrive in Namimori through the use of the teleportation device. Zakuro invades the Vongola base forcing Tsuna and his friends to flee while Squalo buys them time. Tsuna and co decide to hide at Kawahira's realtor from Haru's advice. The successor of Kawahira realtor, a mysterious man, tells Tsuna and his friends to hide inside while he deals with the Funeral Wreaths.

The man introduces himself as Kawahira, whom Tsuna remembers as the man Future I-Pin always mentioned as her regular customer. He then hides Tsuna and his friends in the building. Using Mist illusions, Kawahira is able to send Zakuro away. Elsewhere at Namimori High, Hibari and Dino confront Daisy in battle. Daisy unleashes his Carnage box and stabs his hand through Dino. Hibari intercepts the killing blow and engages Daisy with his Vongola Box weapon, Alaude's Handcuffs.

Hibari defeats Daisy after a short battle and confiscates the Sun Mare Ring. Back at Kawahira's realtor, Yamamoto, Bianchi, Gianni, and Spanner return to the base to search for Squalo. Elsewhere, Byakuran looks at parallel universes and finds where Tsuna and his friends are hiding. Torikabuto manages to enter the realtor and kidnap Yuni by using an illusion and disguising himself as Lambo. Gamma arrives and attacks Torikabuto forcing him to drop Yuni where he then catches her.

Torikabuto releases his carnage box putting everyone around him in a powerful illusion. Chrome's Vongola Box, Daemon Spade's Devil Lens allows her to see through the illusion and helps guide Tsuna's attacks. Tsuna eventually defeats Torikabuto with an X-Burner forcing Kikyo and Bluebell to retreat. Byakuran decides to have the Vindice release Ghost, the final Funeral Wreath, from prison in order to utilize him for the upcoming battle. Later, Yuni suggests to Tsuna and co, that they should hide in the forest.

At the Vindice prison it is revealed that Fran impersonated the Millifiore with illusions and had Mukuro released from prison. Elsewhere, Yuni reveals that her powers of premonition predicted that their final confrontation with Byakuran takes place in the forest and will begin at dawn. While Tsuna and co plan for the upcoming battle, Byakuran reissues the order to have the Vindice prison release Ghost. On the day of the battle, Byakuran and the remaining Funeral Wreaths begin searching for Yuni in the forest. Gokudera, Lal Mirch, and Gamma ambush Zakuro who then releases his Carnage Box.

Zakuro, in his carnage box released form, incapacitates Gamma and Lal. Gokudera releases his Vongola Box's Cambio form, G's Archery, and is seemingly on par with Zakuro. Zakuro charges towards Gokudera while Gokudera attempts to end the battle with the final shot.

The explosion resulting from their last attack gives Gokudera the advantage. An attack from Bluebell injures Gokudera and she releases her carnage box intent on killing him. The Varia arrives in time and intercepts the attack. Meanwhile, Ryohei engages Kikyo in battle and is overwhelmed by Kikyo's box weapons, the Cloud Velociraptor. Ryohei asks Lambo if he wants to see Tsuna's mother, reminding Lambo they need to win the battle in order to return home. Lambo releases his Vongola Box in a rage and transforms it into its cambio form, Lampo's Shield. Using the shield, Lambo sends out a surge of electricity defeating the velociraptors.

Kikyo releases his carnage box which allows him to transform his hair into Spinosauruses and engages Ryohei in battle. Ryohei, uses the Cambio Form of his Vongola Box, Knuckle's Maximum Break, allowing him to gain super-human strength, speed, stamina, and reflexes for three minutes. Kikyo is overwhelmed and uses the spinosaurus to buy time until Ryohei's Cambio Form wears off. Three minutes pass, and Kikyo noticing Hibari on the side, sends his Spinosaurses after Hibari and seemingly kills him.

The Varia are simultaneously defeated by the Real Funeral Wreaths when they reveal their secret abilities. Their deaths, including Hibari's, are revealed to be an illusion cast by Mukuro Rokudo who had replaced them in the midst of battle in order to witness the secret abilities of the Funeral Wreaths. As the battle continues, Byakuran sends Ghost into the battlefield.

The Varia and Funeral Wreaths desist from their battles to focus on Ghost. Ghost begins to absorb the Flames from everyone in the battlefield resulting in Bluebell and Zakuro's deaths. Kikyo's reminisces about Byakuran's explanation of Ghost and reveals Ghost was the result of a failed attempt of bringing a Byakuran from a parallel universe into their universe. Tsuna flies towards the battlefield and attempts to use his Zero Point Breakthrough to counter Ghost's absorption of flames.

Tsuna is able to absorb Ghost completely with the Zero Point Breakthrough revealing he was a mass of Deathperation Flames. Byakuran enters the battlefield announcing that all of Ghost's absorbed flames have gone to him. Tsuna, being the only one with sufficient energy left, battles Byakuran alone and is overwhelmed completely. Byakuran creates a translucent hand trapping Tsuna inside whilst crushing his body.

Byakuran coaxes Tsuna into igniting his ring causing a 7^3 reaction which creates an impenetrable barrier whilst drawing Yuni into the same barrier. Byakuran crushes Tsuna into unconsciousness. He then discovers Yuni was attempting to revive the Arcobaleno to restore the balance of the 7^3 and to assist in the defeat of Byakuran. Reborn converses with Tsuna and is able to awaken him by disclosing that Yuni is using her life force to revive the Arcobaleno and will die when the rite is complete. Byakuran mocks Tsuna about his unlucky life and attempts to kill him once more but is saved by Lancia's ring. Tsuna realizes his friends have been with him throughout all the bad times and regains the resolve to fight resulting in Vongola Primo and his guardians to appear from their respective rings.

Yuni explains that like the Mare ring's ability to allow its user to travel through parallel worlds, the Vongola rings allow the past generation to communicate with their current successors. Vongola Primo converses with Tsuna, revealing the rings had a seal on them, allowing them to be split in half for the Vongola Tournament and their current forms only possess powers equal to the Mare ring. Primo releases the seal causing the Vongola Rings to change forms and disappears. Tsuna continues his battle with Byakuran, overwhelming him completely. As Yuni nearly completes the rite, Gamma manages to infiltrate the barrier and embraces her; exclaiming he will die with her. As the rite completes, their bodies disappear leaving behind the Arcobaleno pacifiers. Tsuna and Byakuran's battle climax with Byakuran perishing from Tsuna's X-Burner.

The Arcobalenos are revived. Collonello reveals that Byakuran's defeat caused all of the crimes he did with the knowledge from parallel world to be annulled and removing Byakuran's reign from all the world. Tsuna and his friends say their goodbyes to their friends before returning the past. During their time travel back, the Arcobalenos do three things: Seal the Mare Rings, gives the people involved with the Vongola the memories from their future selves, and turned the Vongola Box animals into rings. At school, Tsuna and his friends return to their daily life and look towards the sky, thankful for Yuni's sacrifice.

Reborn recaps the events occurring between of the Vongola's invasion of the Millefiore base to Tsuna's battle against Genkishi and the revelation of Shoichi Irie.

Bianchi takes Kyoko and Haru to the Vongola base while leaving Tsuna and his guardians to discuss the upcoming battles with Shoichi. Byakuran sends a holographic image stating he wants to have an official battle between the Vongola and the Milliefiore in a battle of Choice. He reveals to Irie that the Funeral Wreaths and the mare rings they wielded were fakes and he had gathered the Real Six Funeral Wreaths in secret from Irie as he had expected the betrayal. Byakuran then activates the teleportation system in the Merone base transporting all but the White Round Machine, and Tsuna along with his friends. Irie reveals that since they have completed the Arcobaleno trials, Tsuna's guardians are given their respective Vongola boxes for the upcoming battle.

After a long discussion, it is decided Tsuna and his friends rest for the first few days before commencing training for the battle of Choice in ten days time. At the Vongola base, a ring signature was caught on radar and Tsuna and his friends investigate. Tsuna and his friends find Basil from ten years ago to be the cause. At the Vongola base, Basil explains he was sent to the future ten days ago and was given a ring, a box weapon, and a book containing information about his situation and orders to assist Tsuna and his friends.

Tsuna and his friends split up and explore the Namimori of the future. They all coincidentally meet in front of their school, Namimori Middle, and relax in their classroom. Tsuna realizes that to return to their own time, they must defeat Byakuran in the battle of choice. On the roof of Namimori Middle, Hibari encounters the future Dino who insists on training him.

Kyoko and Haru become concerned that Chrome has not been eating, since she is not used to the kindness of others. Hoping to cheer her up, Tsuna attempts to find out more information on Mukuro's whereabouts from Irie, but to no avail. During a welcome party for Basil, I-pin sneaks off into Chrome's room and manages to get her to eat some gyoza. The next day, Kyoko and Haru find Chrome helping out with the dishes, and they start to become good friends.

Gokudera brings a newspaper from the current time from which Yamamoto learns about Namimori Middle's baseball team's consecutive losing streak and how the baseball club may be canceled. He heads to Namimori middle and runs into three first year members of the baseball club and offers to train them for the upcoming game. The next day, Tsuna and his friends watch the game. Namimori middle baseball team becomes discouraged as the mercy rule will be imposed if they can not gain a point. The batter, being one of the three trained by Yamamoto, remembers he should do his best for friends, and hits a home run. Yamamoto feeling satisfied with the team's progress, promises to help Tsuna defeat Byakuran.

Reborn tells Tsuna and his friends that they must master the airbikes before the Battle of Choice. While Tsuna's friends have quickly mastered the airbikes, Tsuna has yet to grasp the basic. While talking to Kyoko and Haru, Tsuna realizes he must learn how to ride the airbike one step at a time and continue to practice. With the help of his friends, Tsuna is able to grasp how to ride the airbike.

After they finished practicing on the airbikes, Reborn tells Tsuna and his friends they shall train tomorrow on opening their respective Vongola Boxes. Tsuna's box weapon shakes violently that evening and Tsuna opens it and releases his box weapon. Tsuna's box weapon attacks him and with the help of Yamamoto and Basil, they are able to seal the box weapon back to its box. Dino arrives and tells Tsuna his box weapon attacked him because he opened it incorrectly and comments that the Sky Box Weapons must be used delicately.

Dino in his room unleashes his box weapon but is accidentally swallowed by it. One by one, Tsuna's friends are swallowed by the box weapon until Tsuna and Basil are the only ones who remain. Tsuna contemplates to destroy the box weapon to stop the menace but hesitates when he realizes his friends will die with it. The box weapon begins to lay eggs and inside are Tsuna's friends who has been eaten by the box weapon. Dino reveals that the box weapon he bought rejuvenates those that it eats. Reborn tells Tsuna and his friends that they will begin to train with their Vongola Boxes.

Dino gives each of the Vongola guardians individual training regimes for their Vongola Boxes. Unbeknownst to them however, Haru and Kyoko had eavesdropped on their conversation. Lambo manages to open his Vongola Box, but Tsuna still has trouble controlling his. Meanwhile, Squalo travels to Japan.

Kyoko and Haru confront Tsuna and company about what they heard. When Tsuna refuses to tell them anything, the girls start a boycott, refusing to do any housework until they tell them. The guys struggle to do the housework, as well as their training. After talking with Bianchi and noticing Chrome's training wounds, the girls reconsider their decision. Tsuna is tricked by Bianchi into thinking Kyoko is in danger and rushes after her. Although Kyoko decides to end the boycott, Tsuna decides to tell her everything anyway, having realised how selfish he was being. After talking with Kyoko, she helps Tsuna figure out how his Vongola Box works.

Tsuna tells everything he told Kyoko to Haru, who is a bit shocked at the scale of everything, but holds in her sadness until Tsuna leaves. Byakuran hacks into the communications system, giving them the date and location of Choice, and informing them that they will need to bring everyone who came from the past, including Kyoko and Haru. Reborn lets slip that Tsuna told the girls everything, which makes Ryohei mad at Tsuna, even punching him. Just then Squalo appears, beats up Yamamoto and takes him away in order to train him. During the six days leading up to Choice, everyone manages to finish their training.

As the Real Six Funeral Wreaths prepare for battle, Tsuna pays a visit to Lal Mirch. Afterwards, everyone puts on special mafia suits made from Leon's thread. They arrive at Namamori Shrine, where Shoichi has prepared a base of operations. However, Yamamoto and Hibari have yet to arrive. Byakuran appears, telling them they'll need to provide a massive amount of Dying Will flame energy to activate a teleporter to take them to the battlefield. Yamamoto and Hibari arrive at the last minute and, with their Vongola Boxes, the group manage to produce double the power needed.

Tsuna and co are transported to the center of an abandoned city where the battle of choice is to take place. They spin a roulette to decide which members will participate in the battle. Tsuna's team consists of Yamamoto, Gokudera, Irie, Spanner, and himself while Byakuran's consists of Kikyo, Daisy, Torikabuto, and Torikabuto's underling Saru. Before the battle begins, Byakuran explains that each team has a target that must be defeated in order to win the battle; the target for the Millefiore family is Daisy while the Vongola's is Irie. The winner of the battle shall be awarded the Mare Rings, Vongola Rings, and Arcobaleno Pacifiers.

After setting up their base, Shoichi guides Tsuna through the intercom where he runs into Torikabuto. Tsuna is seemingly overwhelmed by Torikabuto's attacks until he releases his box weapon, the Sky Lion Na-Tsu. Torikabuto surrounds Tsuna with projectile attacks and seemingly impales him in a sphere of needles. However, Tsuna transforms Na-Tsu into a cloak and wards off the attack.

After Tsuna defeats Torikabuto with the help of Na-Tsu, Yamamoto encounters Saru. Saru reveals himself to be none other than Genkishi. However, Yamamoto surprises Genkishi with Kojiro, his box weapon, merging with Shigure Kintoki to form Asari Ugetsu. His other box weapon, Jiro, changes his three small swords as well.

Yamamoto defeats Genkishi and incapacitates him. While Genkishi expresses his disappointment not being one of the Real Six Funeral Wraths and not being appointed Byakuran's most trusted soldiers, Kikyo uses his box weapon and kills Genkishi. Kikyo reveals to Genkishi that it was under Byakuran's order to kill him when his usefulness is fulfilled. Tsuna's friends realizing, Byakuran's true nature, become even more motivated to win the battle of Choice.

Kikyo reveals that the Funeral Wraths were holding back to entertain Byakuran who has become tired of flawless victories. Kikyo is able to bypass Gokudera and approaches the base where Irie is currently hiding. At the same time, Yamamoto attempts to break through the barrier and defeat Daisy before Irie is killed. Tsuna meanwhile is trapped in an illusion by Torikabuto who was revealed to have faked his own defeat.

Irie mobilizes the base in an attempt to escape from Kikyo. After a long chase scene, Kikyo manages to destroy the base and inflicts a fatal wound on Irie. At the same time Yamamoto breaks through the barrier and defeats Daisy and extinguish his marker. Tsuna, having escaped from Torikabuto's illusion with the use of his X-Burner, arrives to finds the marker on Irie has been extinguished. Daisy however regains consciousness and is able to relight his marker causing the Millifiore to be pronounced the Winner of Choice.

As Irie recovers from his injuries, he explains to Tsuna and the others about why is he obsessed with Byakuran. Using Ten-Year-Bazooka ammo he had received from Lambo's family 11 years ago, Irie went to the future and ran into Byakuran. When he revisited it, hoping to change, it awakened Byakuran's ability to retain the knowledge of different parallel worlds. Byakuran used this knowledge to conquer and destroy several parallel worlds. Eventually, the future Irie arranged for the younger Irie's memories to be temporarily wiped for five years in order to gain Byakuran's trust, since the current world is the only one that is not ruled by Byakuran.

Irie reveals that their world has not been taken over due to his and Future Tsuna's intervention and that the plan to bring their past selves to the future was thought of by Future Tsuna. Byakuran demands the surrender of the Vongola rings after the Choice battle. However, due to Byakuran owing Irie a favor and Yuni's, the second leader of the Millifiore Family, opposition, the match is annulled. Yuni asks Tsuna to protect her and announces to Byakuran she will be defecting from the Millifiore.

Tsuna and co. manage to ellude Byakuran with the help of an illusion made by Mukuro Rokudo and manage to activate the transport device returning them to Nanimori. While sheltering at the Vongola base, Tsuna wonders if they can defeat Byakuran.

After Tsuna and his friends escape from Byakuran with the help of Mukuro Rokudo, Reborn visits Lal and updates her on the events happened so far about choice. As Lal hears every word, Reborn states now its up to them to protect Yuni from Byakuran and protect the future.

While Tsuna and his family are observed by their respective Arcobaleno tutors, Collenello notices that Yamamoto is visibly disturbed by something. The First Generation Rain Guardian, Ugetsu Asari, appears in front of Yamamoto and announces that his trial will take part that night at Namimori Shrine. Yamamoto meets Ugetsu and begins their trial. Yamamoto, blaming himself for their loss in the battle of Choice, fights Ugetsu in an aggressive manner and seemingly defeats him. However, Ugetsu announces that Yamamoto has failed the trial, saying that he is unworthy to inherit his power in his current state.

Ugetsu tells Yamamoto he will give him a second chance at the trial the next night and disappears. The next day, Yuni transfers into Tsuna's school, whilst Tsuna and his friends attempt to find out why Yamamoto failed his trial. Meanwhile, Kyoko and Haru visit Chrome only to find out from Ken and Chikusa that she has been missing since the day they returned from the future. That night, after talking with his father, Yamamoto arrives at the shrine where Tsuna tells him to not push himself. Yamamoto and Ugetsu engage in battle and Yamamoto prepares to deliver the finishing blow but suddenly stops as he remembers his father's and Tsuna's words. Ugetsu declares that Yamamoto has passed the trial and explains that Yamamoto failed the trial last time because he attempted to betray his heart and kill a person. Before leaving, he tells Yamamoto the Rain Guardian must not run dry and must keep his friends together.

Lampo appears before Tsuna and the sleeping Lambo and announces that Lambo's trial will take place at an amusement park. To pass Lampo's trial, Lambo has to gather three stamps by riding three amusement park rides and enter the castle which Lampo resides. The rides are the teacups, a miniature race track, and a course through a robot museum. While going through the rides, Verde hacks into the amusement park systems in order to perform various tests on Lambo and to deduce why Lambo has such a high resistance to electricity. After Verde captures Lambo with a robot, Lambo's fear causes him to release all the electricity Verde shocked him with and which causes an explosion destroying Verde's robot and sends Tsuna and Lambo into castle. Lampo initially deems Lambo has failed the trial since Tsuna missed stamping the paper but decides to pass Lambo after seeing the electricity Lambo released.

Gokudera, impatient with the trials, begins training at the park early in the morning. While Gokudera is busy looking for Uri who runs away, G disguises himself as Gokudera with Fong buy some times for him. At school, Tsuna and his friends notice that Gokudera has been calmer and more reliable than usual, which arouses Tsuna's suspicion. While walking home, Tsuna and Gokudera run into the real Gokudera who reveals that G has been impersonating him. G reveals himself and asks Tsuna how his performance was at school. Tsuna comments that G has been reliable and helpful, which causes G to denounce Gokudera as being unsuitable to be Tsuna's Right Hand man and deems him unworthy of being the Storm Guardian. When G demands Gokudera to return the Vongola Ring and leave Japan, Tsuna defends Gokudera stating that Gokudera is not supposed to be his Right-Hand man but his friend. G then reveals that his trial was to test Tsuna and Gokudera's bond and deems him worthy of the Guardian of Storm.

Hibari's trial does not involve combat which causes Hibari to lose interest. Alaude, the First Cloud Guardian, tells Hibari he must demonstrate his worth as the Cloud Guardian to pass his trial and he has a day to complete it. While Tsuna and his friends try to persuade Hibari to take the trial to no avail, leaving only Ryohei to persuade him. During Ryohei's persistent way of persuading Hibari, Skull appears with a blimp and attempts to force Hibari to take the trial by attacking him. Hibari damages the blimp which causes it to begin its descent on the school.

Ryohei manages to destroy the blimp before it crashes into the school. Skull, enraged by the two, continues his attack on the school but is soon defeated by Hibari. Soon after, the First Sun Guardian, Knuckle, allows Ryohei to pass his trial after witnessing his extreme optimism for the day and how he defeated the blimp without fear in order to protect his friends and finally able to convince Hibari to take trial, something that no one able to achieve. Alaude then makes his appearance and announces Hibari has passed his trial as the Cloud Guardian by indirectly protecting the family without fraternizing with them. At Kokuyo Land, Chrome finally returns to her hideout and collapses in tears in front of Ken and Chikusa. While discussing Chrome, Tsuna and co decide to go to Kokuyo Land in case Chrome returns. Outside Tsuna's house, the First Mist Guardian, Daemon Spade, comments that Tsuna is unfit to become Vongola Boss like Vongola Primo once was.

Tsuna and his friends are visiting Chrome when they run into Ken and Chikusa who tells them Chrome's strange behavior. They discover that Chrome has completely terrified of something, leading Kyoko, Haru, I-Pin, and Yuni to stay with Chrome until she calms down while Tsuna and the rest go back. Reborn holds a meeting with other Arcobaleno regarding Chrome's sudden change and deduce that it was connected to the First Mist Guardian, Daemon Spade. In the afternoon, Reborn gathers the Arcobalenos and Tsuna's guardians to meet with Chrome once again for the inheritance. However, Daemon Spade appears and traps the Chrome along with the other girls in the building and declares Tsuna is unfit to be the Vongola Tenth.

Daemon Spade reveals that he had been controlling Chrome to draw them out and tells Tsuna and his friends that he will now be testing them all on his own terms in order to turn them into his idea version of the Vongola Family. Tsuna and his friends enter the building and are then separated and confronted by a dark version of themselves created by Daemon. While the dark versions gain the upper hand, Daemon tells Yamamoto that he must kill his double, while simultaneously tells Ryohei to be merciless in battle and abandon Lambo in order to win, and taunts Tsuna and Gokudera that Tsuna is not worth to be protected.

Tsuna and his friends continue to battle their respective counterparts. Daemon tries to convince them to become cruel and merciless, but Tsuna and his friends stay true to their convictions and refuses to become the people that Daemon want. During their fight, Daemon reveals to Tsuna that he was the one who caused Primo to flee to Japan in order to have the Vongola be ruled under a more suitable boss since he deemed Primo to be too soft. Fong and Collonelo called Verde and Mammon for their cooperation while Skull bring Hibari to Kokuyo Land by stealing his armband. Once the Arcobaleno has gathered, they able to disperse Daemon's illusionary space with their combined efforts. However, despite the sudden outcome, Daemon refuse to back down and decide to be serious to continue their battle.

Daemon engages Tsuna alone in battle and traps him in an illusion and tricks Tsuna into firing an X-Burner at where Kyoko, Haru, Yuni, I-Pin, and Chrome are. Mukuro quickly takes over Chrome, averts the attack, and disperses the illusion allowing Tsuna to defeat Daemon. Daemon, convinced he is unable to change the Tsuna and his friends, gives up on changing them. Instead, he begins to questions Mukuro and deems him worthy as the Mist Guardian and allows him to pass the trial as he sees Mukuro much more promising than the other guardians. At that moment, Primo appears and declares Tsuna to be worthy to be the Tenth Vongola Boss after observing his every actions and also passes him. The First Generation of the Vongola Family then return their consciousness to the Vongola Rings and so does the remaining Arcobaleno. The next day, Tsuna and his friends gather at the Namimori Shrine where they are then sent back to the future by Spanner.

Reborn recaps the events that took place in the past to Lal Mirch and the inheritance trials Tsuna and his family went through.

Shoichi Irie tells Tsuna that in order to open the Vongola Box, the Seven Arcobaleno Seals are needed. In order to obtain the seals, Tsuna needs to overcome the Arcobaleno trials. To do so, Irie will momentarily send everyone who came from 10 years ago back home. Chrome Dokuro asks Irie on Mukuro Rokudo's status and Irie reveals that his death was not confirmed. Tsuna and the others return to the Vongola base where they are reunited with everyone else. At the base, Ryohei Sasagawa is filled in on the events that have occurred and Tsuna thinks how he should tell Kyoko and Haru about this and whether they could return to the peaceful days again.

Back in the past, the 7 Arcobaleno are heading to Namimori to present Tsuna with their trials. Meanwhile, in the future, Irie is telling Tsuna and his friends the details before sending them to the past. He reveals that although months have passed in the future, only three days have passed in the past. He warns them that they should not tell anyone what happens in the future for fear of affecting it. He also tells them that the Arcobaleno Trials are a week long and must be completed without fail. Using Irie's device, they are sent back in time. Everyone resumes their normal lives. The Irie Shoichi of the past receives a letter from himself that tells him to place the Ten-Year Bazooka under the Namimori Shrine. Hayato Gokudera and Takeshi Yamamoto arrive to Tsuna's house where Reborn informs them that the Arcobaleno trials involve Tsuna's guardians. He then explains the background of each Arcobaleno and reveals they each have a special ability.

The next day, Tsuna's class receives two transfer students, Monta Hariyama and Himeko Hariyama. During the break, Tsuna is attacked by Lal Mirch of their time period who reveals she will be the observer of the Arcobaleno trials. Colonnello appears and reveals he is their first opponent in the trial. Colonnello chooses Tsuna and Gokudera to undertake the first trial. The goal of the first trial is to grab the button on Colonnello's headband. Tsuna and Gokudera are overwhelmed by Colonnello's traps and attacks. Tsuna tells Gokudera that fighting separately will not work and they must work together to defeat Colonnello.

Colonnello continues to overwhelm the two. He is defeated when Gokudera distracts Colonnello for Tsuna to use X-burner on him. Colonnello gives Tsuna the Arcobaleno Seal, which causes all the Vongola rings to glow simultaneously. Skull makes his appearance and is revealed to be scheming something with Viper. Later, a person pretending to be Tsuna provokes Kyoya Hibari and Mukuro, causing them to pursue the imposter. Tsuna and Reborn are heading to Chrome's hideout to give her some bentō and end up meeting Mukuro and Hibari. Mukuro and Hibari begin their battle against each other.

Mukuro and Hibari continue their battle and Lal appears announcing this is the second trial. Skull calls his pet octopus to combat but Tsuna easily defeats it. Afterwards, he stops Hibari and Mukuro from battling each other and Lal announces Tsuna has passed the second trial, charisma. At night, Monta Hariyama and Himeko Haryiyama are seen plotting a suspicious plan. The next day, Tsuna receives a phone call demanding him to meet the person at school or face dire consequences.

Tsuna, Yamamoto and Ryohei are called out to Namimori Middle School where they encounter Mammon, who reveals he has Kyoko hostage. Mammon begins Tsuna's trial with a set of riddles which leads them to various locations. The final riddle leads them to Namimori Shrine, where he reveals he did not have Kyoko hostage. Mammon uses a box weapon and releases a starfish to battle the three and is quickly defeated. Tsuna passes Mammon's trial of adaptability and receives the seal. Reborn asks Mammon about his box weapons and the latter replies that the boxes have been showing up in the mafia and he was asked to test them out by the Arcobaleno Verde.

Tsuna returns home after completing the trial. The next day, Tsuna receives a letter from the Arcobaleno, Fong, who is also revealed to be I-pin's Martial Arts sensei. The letter tells Tsuna and his guardians to search for him around town. Tsuna, Lambo, and Haru find Fong at Namimori Middle School. Fong's trial is revealed to test Tsuna of his leadership capabilities. Tsuna is required to catch Fon in one hour by using the people at his disposal. Fong is eventually caught by Tsuna with the help of I-pin who had been hiding in the shadows, and passes the trial. I-pin, having spotted Hibari, becomes embarrassed and activates her Pinzu Time Bomb and is thrown out the window before exploding.

Tsuna and his friends discuss who the remaining Arcobaleno are. At that moment, a woman wielding an orange pacifier, named Aria, arrives with Haru and Kyoko and reveals that she will give Tsuna his next trial. Afterwards, she takes Tsuna along with Haru and Kyoko to guide her around town and treats Tsuna like a servant. The girls find Chrome and leave with her to buy some juice. At that moment, Tsuna and Aria are attacked by Verde's men but they are quickly defeated by Tsuna and his family. Aria reveals Tsuna has passed the trial of tolerance and grants him the Arcobaleno seal. Aria shares a quick dialogue with Reborn and leaves. That night, Reborn announces he will be the host of Tsuna's next trial.

Reborn tells Tsuna and his guardians to assemble at Namimori Island for the next trial. When everyone reaches Namimori Island, the trial is revealed to be a battle of Tsuna's family against Reborn. Reborn knocks Tsuna unconscious and battles against Tsuna's guardians. While watching the trial, Lal Mirch recalls what had happened when the chosen seven to protect the Arcobaleno pacifiers met for the first time, and reveals that Reborn was the strongest of them. Tsuna regains consciousness after the defeat of his guardians and engages Reborn in battle. During the battle, Reborn reminisces on the day he became an Arcobaleno. Tsuna gains the advantage over Reborn, hesitates to use the X-Burner and is defeated. Reborn then announces Tsuna has failed his trial.

While Tsuna's family is recuperating, Verde completes the first stage for his box weapons and decides to seek out the Vongola Rings to help him complete the second stage. All of the Arcobaleno, except Verde, gather at Namimori Shrine to discuss about the trials. Tsuna, Gokudera, Yamamoto, and Ryohei discuss about their battle with Reborn and how they lacked resolve in the trial which caused their defeat. At that moment, Verde sends his inventions to attack the Vongola Ring holders. Reborn announces to Colonnello and Lal Mirch that Verde has broken the Arcobaleno pact and must be stopped.

Verde sends out robots to seek the Tsuna's missing two guardians, Lambo and Hibari. Hibari defeats his robot and Fong defeats the robot pursuing Lambo. Soon after, the other Arcobaleno's arrive to investigate the disturbance. Verde reveals he planned to gather the seven Arcobalenos and uses a machine that emits non-trisette rays to restrain the Arcobalenos. Using his robots, he captures the Arcobalenos and takes them to his ship.

Verde demands Tsuna and his guardians to surrender the Vongola Ring in return for the Arcobaleno's lives. Tsuna refuses to compiles as the rings will be needed for the future battles and declares they shall defeat Verde and save the Arcobaleno. Verde uses a machine and absorbs their flames and uses it to power his box weapons. Unable to utilize ring flames, Verde begins to overwhelm them. Tsuna and his friends regain their resolve and are able to utilize the ring flames to gain the upper hand. When Tsuna destroys the machine emitting non-trisette rays, Verde seemingly kills the Arcobalenos by self destructing his robots. Reborn reveals that the Arcobalenos who were captured by the robots were illusions and that they were waiting until the non-trisette rays dispersed. After Verde's defeat, it is revealed to be a robot and Verde is hiding elsewhere.

Tsuna, with his Hyper Intuition, feels that Verde is nearby and finds Verde hiding in a nearby island. Verde declares his research is complete after gathering data on the Vongola Rings' Flames and states he will not need the Vongola Rings any more. He gives Tsuna the Arcobaleno seal as he has passed Verde's trial of Intuition. As they leave Verde's base, Reborn tells Tsuna he has passed his trial after showing his resolution to protect his friends in the previous battle and gives Tsuna his Arcobaleno Seal. With all seven seals gathered, Tsuna and his friends meet at Nanimori Shrine. Using the ten-year bazooka, they are sent back to the future where Irie greets them and announces they shall train for the battle against Byakuran.

Bianchi takes Kyoko and Haru to the Vongola base while leaving Tsuna and his guardians to discuss the upcoming battles with Shoichi. Byakuran sends a holographic image stating he wants to have an official battle between the Vongola and the Milliefiore in a battle of Choice. He reveals to Irie that the Funeral Wreaths and the mare rings they wielded were fakes and he had gathered the Real Six Funeral Wreaths in secret from Irie as he had expected the betrayal. Byakuran then activates the teleportation system in the Merone base transporting all but the White Round Machine, and Tsuna along with his friends. Irie reveals that since they have completed the Arcobaleno trials, Tsuna's guardians are given their respective Vongola boxes for the upcoming battle.

After a long discussion, it is decided Tsuna and his friends rest for the first few days before commencing training for the battle of Choice in ten days time. At the Vongola base, a ring signature was caught on radar and Tsuna and his friends investigate. Tsuna and his friends find Basil from ten years ago to be the cause. At the Vongola base, Basil explains he was sent to the future ten days ago and was given a ring, a box weapon, and a book containing information about his situation and orders to assist Tsuna and his friends.

Tsuna and his friends split up and explore the Namimori of the future. They all coincidentally meet in front of their school, Namimori Middle, and relax in their classroom. Tsuna realizes that to return to their own time, they must defeat Byakuran in the battle of choice. On the roof of Namimori Middle, Hibari encounters the future Dino who insists on training him.

Kyoko and Haru become concerned that Chrome has not been eating, since she is not used to the kindness of others. Hoping to cheer her up, Tsuna attempts to find out more information on Mukuro's whereabouts from Irie, but to no avail. During a welcome party for Basil, I-pin sneaks off into Chrome's room and manages to get her to eat some gyoza. The next day, Kyoko and Haru find Chrome helping out with the dishes, and they start to become good friends.

Gokudera brings a newspaper from the current time from which Yamamoto learns about Namimori Middle's baseball team's consecutive losing streak and how the baseball club may be canceled. He heads to Namimori middle and runs into three first year members of the baseball club and offers to train them for the upcoming game. The next day, Tsuna and his friends watch the game. Namimori middle baseball team becomes discouraged as the mercy rule will be imposed if they can not gain a point. The batter, being one of the three trained by Yamamoto, remembers he should do his best for friends, and hits a home run. Yamamoto feeling satisfied with the team's progress, promises to help Tsuna defeat Byakuran.

Gokudera brings a newspaper from the current time from which Yamamoto learns about Namimori Middle's baseball team's consecutive losing streak and how the baseball club may be canceled. He heads to Namimori middle and runs into three first year members of the baseball club and offers to train them for the upcoming game. The next day, Tsuna and his friends watch the game. Namimori middle baseball team becomes discouraged as the mercy rule will be imposed if they can not gain a point. The batter, being one of the three trained by Yamamoto, remembers he should do his best for friends, and hits a home run. Yamamoto feeling satisfied with the team's progress, promises to help Tsuna defeat Byakuran.

Reborn tells Tsuna and his friends that they must master the airbikes before the Battle of Choice. While Tsuna's friends have quickly mastered the airbikes, Tsuna has yet to grasp the basic. While talking to Kyoko and Haru, Tsuna realizes he must learn how to ride the airbike one step at a time and continue to practice. With the help of his friends, Tsuna is able to grasp how to ride the airbike.

After they finished practicing on the airbikes, Reborn tells Tsuna and his friends they shall train tomorrow on opening their respective Vongola Boxes. Tsuna's box weapon shakes violently that evening and Tsuna opens it and releases his box weapon. Tsuna's box weapon attacks him and with the help of Yamamoto and Basil, they are able to seal the box weapon back to its box. Dino arrives and tells Tsuna his box weapon attacked him because he opened it incorrectly and comments that the Sky Box Weapons must be used delicately.

Dino in his room unleashes his box weapon but is accidentally swallowed by it. One by one, Tsuna's friends are swallowed by the box weapon until Tsuna and Basil are the only ones who remain. Tsuna contemplates to destroy the box weapon to stop the menace but hesitates when he realizes his friends will die with it. The box weapon begins to lay eggs and inside are Tsuna's friends who has been eaten by the box weapon. Dino reveals that the box weapon he bought rejuvenates those that it eats. Reborn tells Tsuna and his friends that they will begin to train with their Vongola Boxes.

Dino gives each of the Vongola guardians individual training regimes for their Vongola Boxes. Unbeknownst to them however, Haru and Kyoko had eavesdropped on their conversation. Lambo manages to open his Vongola Box, but Tsuna still has trouble controlling his. Meanwhile, Squalo travels to Japan.

Kyoko and Haru confront Tsuna and company about what they heard. When Tsuna refuses to tell them anything, the girls start a boycott, refusing to do any housework until they tell them. The guys struggle to do the housework, as well as their training. After talking with Bianchi and noticing Chrome's training wounds, the girls reconsider their decision. Tsuna is tricked by Bianchi into thinking Kyoko is in danger and rushes after her. Although Kyoko decides to end the boycott, Tsuna decides to tell her everything anyway, having realised how selfish he was being. After talking with Kyoko, she helps Tsuna figure out how his Vongola Box works.

Tsuna tells everything he told Kyoko to Haru, who is a bit shocked at the scale of everything, but holds in her sadness until Tsuna leaves. Byakuran hacks into the communications system, giving them the date and location of Choice, and informing them that they will need to bring everyone who came from the past, including Kyoko and Haru. Reborn lets slip that Tsuna told the girls everything, which makes Ryohei mad at Tsuna, even punching him. Just then Squalo appears, beats up Yamamoto and takes him away in order to train him. During the six days leading up to Choice, everyone manages to finish their training.

As the Real Six Funeral Wreaths prepare for battle, Tsuna pays a visit to Lal Mirch. Afterwards, everyone puts on special mafia suits made from Leon's thread. They arrive at Namamori Shrine, where Shoichi has prepared a base of operations. However, Yamamoto and Hibari have yet to arrive. Byakuran appears, telling them they'll need to provide a massive amount of Dying Will flame energy to activate a teleporter to take them to the battlefield. Yamamoto and Hibari arrive at the last minute and, with their Vongola Boxes, the group manage to produce double the power needed.

Tsuna and co are transported to the center of an abandoned city where the battle of choice is to take place. They spin a roulette to decide which members will participate in the battle. Tsuna's team consists of Yamamoto, Gokudera, Irie, Spanner, and himself while Byakuran's consists of Kikyo, Daisy, Torikabuto, and Torikabuto's underling Saru. Before the battle begins, Byakuran explains that each team has a target that must be defeated in order to win the battle; the target for the Millefiore family is Daisy while the Vongola's is Irie. The winner of the battle shall be awarded the Mare Rings, Vongola Rings, and Arcobaleno Pacifiers.

After setting up their base, Shoichi guides Tsuna through the intercom where he runs into Torikabuto. Tsuna is seemingly overwhelmed by Torikabuto's attacks until he releases his box weapon, the Sky Lion Na-Tsu. Torikabuto surrounds Tsuna with projectile attacks and seemingly impales him in a sphere of needles. However, Tsuna transforms Na-Tsu into a cloak and wards off the attack.

After Tsuna defeats Torikabuto with the help of Na-Tsu, Yamamoto encounters Saru. Saru reveals himself to be none other than Genkishi. However, Yamamoto surprises Genkishi with Kojiro, his box weapon, merging with Shigure Kintoki to form Asari Ugetsu. His other box weapon, Jiro, changes his three small swords as well.

Yamamoto defeats Genkishi and incapacitates him. While Genkishi expresses his disappointment not being one of the Real Six Funeral Wraths and not being appointed Byakuran's most trusted soldiers, Kikyo uses his box weapon and kills Genkishi. Kikyo reveals to Genkishi that it was under Byakuran's order to kill him when his usefulness is fulfilled. Tsuna's friends realizing, Byakuran's true nature, become even more motivated to win the battle of Choice.

Kikyo reveals that the Funeral Wraths were holding back to entertain Byakuran who has become tired of flawless victories. Kikyo is able to bypass Gokudera and approaches the base where Irie is currently hiding. At the same time, Yamamoto attempts to break through the barrier and defeat Daisy before Irie is killed. Tsuna meanwhile is trapped in an illusion by Torikabuto who was revealed to have faked his own defeat.

Irie mobilizes the base in an attempt to escape from Kikyo. After a long chase scene, Kikyo manages to destroy the base and inflicts a fatal wound on Irie. At the same time Yamamoto breaks through the barrier and defeats Daisy and extinguish his marker. Tsuna, having escaped from Torikabuto's illusion with the use of his X-Burner, arrives to finds the marker on Irie has been extinguished. Daisy however regains consciousness and is able to relight his marker causing the Millifiore to be pronounced the Winner of Choice.

As Irie recovers from his injuries, he explains to Tsuna and the others about why is he obsessed with Byakuran. Using Ten-Year-Bazooka ammo he had received from Lambo's family 11 years ago, Irie went to the future and ran into Byakuran. When he revisited it, hoping to change, it awakened Byakuran's ability to retain the knowledge of different parallel worlds. Byakuran used this knowledge to conquer and destroy several parallel worlds. Eventually, the future Irie arranged for the younger Irie's memories to be temporarily wiped for five years in order to gain Byakuran's trust, since the current world is the only one that is not ruled by Byakuran.

Irie reveals that their world has not been taken over due to his and Future Tsuna's intervention and that the plan to bring their past selves to the future was thought of by Future Tsuna. Byakuran demands the surrender of the Vongola rings after the Choice battle. However, due to Byakuran owing Irie a favor and Yuni's, the second leader of the Millifiore Family, opposition, the match is annulled. Yuni asks Tsuna to protect her and announces to Byakuran she will be defecting from the Millifiore.

Tsuna and co. manage to ellude Byakuran with the help of an illusion made by Mukuro Rokudo and manage to activate the transport device returning them to Nanimori. While sheltering at the Vongola base, Tsuna wonders if they can defeat Byakuran.

After Tsuna and his friends escape from Byakuran with the help of Mukuro Rokudo, Reborn visits Lal and updates her on the events happened so far about choice. As Lal hears every word, Reborn states now its up to them to protect Yuni from Byakuran and protect the future.

Hibari starts knocking the Millefiore members unconscious one by one. The place he lured them to is revealed to be meant for attacks like this. The Vongola find out that one of the shopping malls ducts lead to the Millefiore base. They enter the ducts only to trigger a trap where lasers prepare to fire on them.

Tsuna and the others escape the ducts by breaking it open and falling to the ground below. There they face Dendro Chilum. Tsuna defeats him with the X Burner and they continue in the Millefiore base undetected.

They continue on and encounter GingerBread, a young boy who asks them whether they are after him for revenge for their friend, Colonnello. Lal Mirch battles GingerBread but is severely injured in the process.

GingerBread reveals that Colonnello died by saving Viper who then killed himself out of hopelessness. Lal Mirch remembers back to the past before she becomes an incomplete Acrobaleno because Colonnello took her place. She had a blue incomplete pacifier which she promised not to use so she would become human again. In the present time, Lal Mirch uses her pacifier and defeats GingerBread. It was revealed GingerBread was a doll and explodes, injuring Lal Mirch. Just then the alarm goes off informing Millefiore of their presence.

To avoid being trapped by Millefiore, Lal Mirch volunteers to distract them. Tsuna volunteers in her place since he is the most mobile with his X-Gloves. The team make their way deeper into the base while Tsuna battles Moscas. He is overpowered and gets dragged underwater.

Tsuna escapes from the grasp of the Moscas and continues his battle. He defeats them the minions but the man named Spanner who pilots the King Mosca remains. Tsuna prepares to give up the fight but Reborn tells him he should use the X Burner in the air. Tsuna defeats the King Mosca but loses consciousness in the process. Spanner leaves the Mosca and prepares to kill Tsuna.

Tsuna's family become worried at the amount Tsuna is gone while they continue searching the base. While crawling through an air duct, they run into Baishana and Nigella fighting. Nigella is then beaten by Baishana box weapon, a snake covered in storm flames. Ryohei decides to fight in place of Yamamto and Gokudera and summons his box weapon Kangayuu, a Kangaroo. Back at Tsuna's scene of the battle, Tsuna and Spanner are nowhere to be found.

Tsuna awakens to find himself a captive of Spanner. Spanner tells him he has covered up Tsuna's whereabouts by reporting him as missing to the Millefiore. Meanwhile, Ryohei continues his battle but now in the air as Kangayuu shoots out boots that propel him into the air with the sun flames.

Ryohei defeats Baishana and his box weapon with a move called "Maximum Ingram". Back at the Vongola hideout, Haru is worried about Tsuna and Kyoko is worried about her brother. Ryohei, Gokudera, and Yamamoto continue their way into the base but suddenly the base starts to move.

The base is moved by Irie Shouichi and Ryohei and Gokudera are separated from Yamamoto and Lal Mirch. Ryohei and Gokudera then run into a white spell Millefiore member who uses his box animal of a slime monster to attack them. Gokudera is trapped inside but is then freed by Uri. He then destroys the box animal. Meanwhile Yamamoto with Lal Mirch wanders into a room and is surprised by what he sees.

Yamamoto ends up in a room full of pipes. There he meets a white-spell Millefiore member who uses a boomerang with the storm flame to attack him. Yamamoto realizes that he could not predict where the attacks are coming from because he is actually fighting twins. Yamamoto defeats them. Irie Shouichi moves the base again and Gokudera and Ryohei run into Gamma.

Ryohei ties up Gokudera with a box weapon to make the battle fair against Gamma. Tsuna meanwhile attempts to escape from Spanner but Reborn who is able to get in contact with him after the base moves closer to the surface, tells him he needs to master the X-Burner or he can not defeat Millefiore. Ryohei is severely injured by Gamma. Hibari continues his way in the subway, surrounded by Milliefiore members once again.

Ryohei manages to heal himself and continues his battle with Gamma. He is however defeated by Gamma's Electric Tower technique. Gokudera is free from the ropes and reveals his Sistema C.A.I.

Gokudera talks about his Sistema C.A.I. and explains how he discovered its use. Hibari continues his way into the subway and uses his box weapon to trap the Millefiore members on the other side. Spanner explains to Tsuna that he will create contact lenses so Tsuna would be able to measure his flame power on his gloves and help him balance his X-burner.

Gamma manages to open a box to unleash his box animal powers, turning his foxes black in color. Gokudera is defeated, but Gokudera's box animal Uri comes out of Kangayuu's pouch charged with Sun flames as a lepord to defend him.

It is revealed the Sun flames from Ryohei's box animal was used by Uri to transform. Uri manages to hold back Gamma's box animals while Gokudera deals with Gamma. Meanwhile, Gamma remembers when his family was separate from the Millefiore. In his memory, the boss just died, and her daughter Yuni is the heir.

In Gamma's memory, after a failed bargaining with the Millefiore Family, Genkishi returns with injuries to the Giglio Nero family. Yuni decides to meet with Byakuran to prevent any more of her subordinates being hurt. After meeting with him privately, Yuni returns emotionless and a loyal servant to Byakuran. Gamma mentions how Genkishi was the biggest traitor to the Giglio Nero Family and how he wants to defeat Byakuran.

Lal Mirch recaps what has happened during their invasion of the Milliefiore base up to the point Gokudera's and Gamma's battle.

Tsuna needs to be placed in battle so the contacts can be adjusted for the X-burner. Tsuna puts on gears that puts him in a virtual space to fight Moscas; he could die if he dies in that space. Later, Irie Shouichi moves the base again and places a virus in the virtual space and Tsuna must defeat it.

Yamamoto runs into the same black spell member Nosaru. Meanwhile, Tsuna after a long battle defeats the mysterious Ultimate Cube. Yamamoto in his battle manages to push back his enemy and the base is moved again.

Tsuna's contacts are completed and Tsuna waits for the contacts to adjust. Iris and Gingerbread investigate Spanner and suspect him of harboring Tsuna. Yamamoto ends up in a room of water and faces the strongest soldier of the Millefiore, Genkishi. Genkishi reveals that he faked his defeat against Squalo for the purpose of Milliefiore. Back at the Vongola base, Kyoko and Haru are trying to find the missing Chrome, Lambo, and I-pin.

Yamamoto and Genkishi continue to battle, until Yamamoto's sword appears cracked. He then remembers in the video Squalo sent him of Genkishi, that he mentioned mist illusions have gotten to the point it can trick everyone in the surrounding area and even cameras. Meanwhile, Gingerbread and Iris continue searching for Spanner. Yamamoto realizes that Genkishi created the illusion of his sword being cracked and continues their battle.

Chrome was revealed to have impersonated a person in the base. Yamamoto is defeated by Genkishi who reveals the room they were fighting in had steel walls covered by the mist causing Yamamoto to run into one of them. Gokudera and Gamma unleash their final attack.

Gokudera and Gamma finish the battle destroying the battlefield. Meanwhile, Reborn and Tsuna figure out that the circle machine was created by Irie Shouichi for time travel causing them all to be stuck in the future. Iris arrives finding Spanner's hiding place. Genkishi about to deal the final blow to the unconscienced Yamamoto, but is intervened by the arrival of Hibari.

Hibari and Genkishi match each other blow for blow. Meanwhile, Iris gives her death squad a power boost. Another squad team is sent to defeat Chrome, but her illusions of Yamamoto, Gokudera and Ryohei defeat the squad. Hibari is about to use his last 3 rings.

Hibari use his last 3 rings for Reverse Neddle Sphere. Iris's death squad attacks Tsuna and Tsuna fights back which defeated 2 of 4 of Iris's death squad. Hibari from the past comes to the future.

Genkishi finds the Hibari from ten years past in Hibari's place. Meanwhile, Tsuna is still fighting the Deathstalk squad and is having difficulty due to Iris propagating her squad. Gingerbread also, arrives to aid Iris against Tsuna.

Chrome finds Gokudera in the ruins of the battlefield. Meanwhile, Tsuna continues his battle with Iris and Gingerbread. Spanner completes the contact lenses which then allows Tsuna to use a full powered X-Burner aimed at Gingerbread and Iris.

Tsuna defeats Iris and Gingerbread with his X-Burner while destroying three rooms in the process. Meanwhile, Genkishi was about to kill Hibari when the others manage to arrive to Hibari's location and save him. Hibari mentions he's learned how to use the ring from Dino in the past and ignites it. He then uses the flame to release his hedgehog box weapon.

When Hibari opens his original hedgehog box weapon, the hedgehog starts to act drunk from the amount of flames from Hibari's Dying Will given to it. After accidentally poking Hibari's hand, the hedgehog becomes mentally shocked and goes out of control. It rapidly starts to grow, endangering all those around it. Meanwhile, Tsuna heads toward the lab with Spanner in tow.

Tsuna flies through Merone Base with a mission to find Shoichi Irie and the white, round device in his laboratory. Irie tries to interfere with Tsuna's movements by moving Merone Base's blocks. With Spanner behind him, Tsuna cannot shake off a homing missile by increasing his speed, but he is saved by Spanner's modified chaff and flame shots. Tsuna is later intercepted by the Phantom Knight, Genkishi.

Genkishi engages Tsuna in a battle using his hell ring, an armour and a special sword. Tsuna is at a disadvantage as he does not have much energy left due to firing the X Burner few times before. However, Genkishi wavers when Tsuna's resolute eyes reminds him of Uni. Tsuna then sets up a plan to absorb Genkishi's flames, and he regains his energy. Tsuna gains the upper hand and manages to overpower Genkishi.

Genkishi recalls a certain memory of when he had been ordered by Byakuran to annihilate the Giglio Nero Family but was too intimidated by Uni's eyes to do so. Genkishi tries to gain even more power from the ring in order to make up for his blunder and transforms into a skeletal figure, which then shoots out illusions he claims that are linked to the actual guardian souls. However, Tsuna sees through his scheming plots and prepares to fire a full powered X Burner.

Tsuna unleashes a full powered X-Burner and defeats Genkishi. In the wreckage, Tsuna finds Irie Shouichi's white round machine. Irie appears and reveals he's holding all of Tsuna's friend's hostage in a tank. Irie reveals the white round machine holds the older Tsuna and the others. Irie reveals he sent them to the future in order to obtain the Vongola Rings. He demands Tsuna to hand over his Sky Ring or his friends will be killed. The Cervello counts down the time limit for Tsuna to make his decision.

Shouichi tranquilizes the Cervello before they could kill Tsuna's friends. He reveals he is on the Vongola's side, and that all the events that have occurred was a plan devised by Shouichi along with future Tsuna and future Hibari in order to train their past selves to defeat Byakuran. Shouichi reveals that the next step of the plan will depend on the Millefiore base invasion in Italy, which is led by the Varia.

The Varia split up into three groups, Squalo, Lussuria with Levi, and Bel with the new illusionist member of Varia named Fran. Squalo meanwhile finds out Xanxus is displeased with his meal and sends injured soldiers to him. He meets some Milliefiore members and defeats them with his Shark box weapon named Grande Pioggia. Bel and Fran run into Milliefiore members and Bel easily disposes of them with his box weapon Storm Mink. Just then, Bel's butler from his childhood, Olgelt, reveals that Bel's older twin brother, Sil is alive. Sil then appears on a flying throne.

Sil is revealed to be one of the Six Funeral Wreaths. Bel, Fran, Olgelt, and Sil release their box weapons for battle. Sil's box weapon is revealed to be a Storm Bats with the ability to fire invisible sonar waves enchanted with storm flames; The storm flames when in contact with something causes an explosion. Bel and Fran are defeated. Olgelt sends his Rain Elephant and destroys the castle the Varia invaded. In the remains of the castle, an unharmed Xanxus on his throne is seen drinking wine.

The corpse of Bel and Fran are revealed to be illusions of Fran, who wanted to see whether Sil or Xanxus is stronger. Olgelt sends his Rain Elephant after Xanxus but they become petrified in mid-flight. Xanxus' Sky Lion box weapon, Besta, is revealed to be the one petrifying the Elephant. Sil attacks Xanxus with his storm bats causing heavy damage to him. Xanxus unmoving from his throne becomes enraged and reveals Besta is actually a Sky-Storm Liger, an offspring from a Sky lion with a Storm tiger.

Xanxus returns Besta to his box, warning Sil that when he releases Besta, he will be finished. Xanxus demands Sil to call Byakuran. Sil refuses and attacks Xanxus with his Storm Bats. Xanxus releases Besta and defeats Sil. Tsuna and the others receive news that the battle in Italy was successful. At that moment, Ryohei from ten years ago arrives from the past. Shouichi opens up the white capsule containing the ten years later version of Tsuna and his Guardians and gives Tsuna the Vongola Box from his future self.

Back in the past, the 7 Arcobaleno are heading to Namimori to present Tsuna with their trials. Meanwhile, in the future, Irie is telling Tsuna and his friends the details before sending them to the past. He reveals that although months have passed in the future, only three days have passed in the past. He warns them that they should not tell anyone what happens in the future for fear of affecting it. He also tells them that the Arcobaleno Trials are a week long and must be completed without fail. Using Irie's device, they are sent back in time. Everyone resumes their normal lives. The Irie Shoichi of the past receives a letter from himself that tells him to place the Ten-Year Bazooka under the Namimori Shrine. Hayato Gokudera and Takeshi Yamamoto arrive to Tsuna's house where Reborn informs them that the Arcobaleno trials involve Tsuna's guardians. He then explains the background of each Arcobaleno and reveals they each have a special ability.

The next day, Tsuna's class receives two transfer students, Monta Hariyama and Himeko Hariyama. During the break, Tsuna is attacked by Lal Mirch of their time period who reveals she will be the observer of the Arcobaleno trials. Colonnello appears and reveals he is their first opponent in the trial. Colonnello chooses Tsuna and Gokudera to undertake the first trial. The goal of the first trial is to grab the button on Colonnello's headband. Tsuna and Gokudera are overwhelmed by Colonnello's traps and attacks. Tsuna tells Gokudera that fighting separately will not work and they must work together to defeat Colonnello.

Colonnello continues to overwhelm the two. He is defeated when Gokudera distracts Colonnello for Tsuna to use X-burner on him. Colonnello gives Tsuna the Arcobaleno Seal, which causes all the Vongola rings to glow simultaneously. Skull makes his appearance and is revealed to be scheming something with Viper. Later, a person pretending to be Tsuna provokes Kyoya Hibari and Mukuro, causing them to pursue the imposter. Tsuna and Reborn are heading to Chrome's hideout to give her some bentō and end up meeting Mukuro and Hibari. Mukuro and Hibari begin their battle against each other.

Mukuro and Hibari continue their battle and Lal appears announcing this is the second trial. Skull calls his pet octopus to combat but Tsuna easily defeats it. Afterwards, he stops Hibari and Mukuro from battling each other and Lal announces Tsuna has passed the second trial, charisma. At night, Monta Hariyama and Himeko Haryiyama are seen plotting a suspicious plan. The next day, Tsuna receives a phone call demanding him to meet the person at school or face dire consequences.

Tsuna, Yamamoto and Ryohei are called out to Namimori Middle School where they encounter Mammon, who reveals he has Kyoko hostage. Mammon begins Tsuna's trial with a set of riddles which leads them to various locations. The final riddle leads them to Namimori Shrine, where he reveals he did not have Kyoko hostage. Mammon uses a box weapon and releases a starfish to battle the three and is quickly defeated. Tsuna passes Mammon's trial of adaptability and receives the seal. Reborn asks Mammon about his box weapons and the latter replies that the boxes have been showing up in the mafia and he was asked to test them out by the Arcobaleno Verde.

Tsuna returns home after completing the trial. The next day, Tsuna receives a letter from the Arcobaleno, Fong, who is also revealed to be I-pin's Martial Arts sensei. The letter tells Tsuna and his guardians to search for him around town. Tsuna, Lambo, and Haru find Fong at Namimori Middle School. Fong's trial is revealed to test Tsuna of his leadership capabilities. Tsuna is required to catch Fon in one hour by using the people at his disposal. Fong is eventually caught by Tsuna with the help of I-pin who had been hiding in the shadows, and passes the trial. I-pin, having spotted Hibari, becomes embarrassed and activates her Pinzu Time Bomb and is thrown out the window before exploding.

Tsuna and his friends discuss who the remaining Arcobaleno are. At that moment, a woman wielding an orange pacifier, named Aria, arrives with Haru and Kyoko and reveals that she will give Tsuna his next trial. Afterwards, she takes Tsuna along with Haru and Kyoko to guide her around town and treats Tsuna like a servant. The girls find Chrome and leave with her to buy some juice. At that moment, Tsuna and Aria are attacked by Verde's men but they are quickly defeated by Tsuna and his family. Aria reveals Tsuna has passed the trial of tolerance and grants him the Arcobaleno seal. Aria shares a quick dialogue with Reborn and leaves. That night, Reborn announces he will be the host of Tsuna's next trial.

Reborn tells Tsuna and his guardians to assemble at Namimori Island for the next trial. When everyone reaches Namimori Island, the trial is revealed to be a battle of Tsuna's family against Reborn. Reborn knocks Tsuna unconscious and battles against Tsuna's guardians. While watching the trial, Lal Mirch recalls what had happened when the chosen seven to protect the Arcobaleno pacifiers met for the first time, and reveals that Reborn was the strongest of them. Tsuna regains consciousness after the defeat of his guardians and engages Reborn in battle. During the battle, Reborn reminisces on the day he became an Arcobaleno. Tsuna gains the advantage over Reborn, hesitates to use the X-Burner and is defeated. Reborn then announces Tsuna has failed his trial.

While Tsuna's family is recuperating, Verde completes the first stage for his box weapons and decides to seek out the Vongola Rings to help him complete the second stage. All of the Arcobaleno, except Verde, gather at Namimori Shrine to discuss about the trials. Tsuna, Gokudera, Yamamoto, and Ryohei discuss about their battle with Reborn and how they lacked resolve in the trial which caused their defeat. At that moment, Verde sends his inventions to attack the Vongola Ring holders. Reborn announces to Colonnello and Lal Mirch that Verde has broken the Arcobaleno pact and must be stopped.

Verde sends out robots to seek the Tsuna's missing two guardians, Lambo and Hibari. Hibari defeats his robot and Fong defeats the robot pursuing Lambo. Soon after, the other Arcobaleno's arrive to investigate the disturbance. Verde reveals he planned to gather the seven Arcobalenos and uses a machine that emits non-trisette rays to restrain the Arcobalenos. Using his robots, he captures the Arcobalenos and takes them to his ship.

Verde demands Tsuna and his guardians to surrender the Vongola Ring in return for the Arcobaleno's lives. Tsuna refuses to compiles as the rings will be needed for the future battles and declares they shall defeat Verde and save the Arcobaleno. Verde uses a machine and absorbs their flames and uses it to power his box weapons. Unable to utilize ring flames, Verde begins to overwhelm them. Tsuna and his friends regain their resolve and are able to utilize the ring flames to gain the upper hand. When Tsuna destroys the machine emitting non-trisette rays, Verde seemingly kills the Arcobalenos by self destructing his robots. Reborn reveals that the Arcobalenos who were captured by the robots were illusions and that they were waiting until the non-trisette rays dispersed. After Verde's defeat, it is revealed to be a robot and Verde is hiding elsewhere.

Tsuna, with his Hyper Intuition, feels that Verde is nearby and finds Verde hiding in a nearby island. Verde declares his research is complete after gathering data on the Vongola Rings' Flames and states he will not need the Vongola Rings any more. He gives Tsuna the Arcobaleno seal as he has passed Verde's trial of Intuition. As they leave Verde's base, Reborn tells Tsuna he has passed his trial after showing his resolution to protect his friends in the previous battle and gives Tsuna his Arcobaleno Seal. With all seven seals gathered, Tsuna and his friends meet at Nanimori Shrine. Using the ten-year bazooka, they are sent back to the future where Irie greets them and announces they shall train for the battle against Byakuran.

Reborn recaps the events occurring between of the Vongola's invasion of the Millefiore base to Tsuna's battle against Genkishi and the revelation of Shoichi Irie.

Reborn is hit by Lambo's ten year bazooka and sent to the future. The strange thing is nobody came in his place. Thus Tsunayoshi Sawada tries to make Adult Lambo appear by taking Lambo's bazooka and firing it at him in order to explain what had happened, but results Tsuna to be accidentally shot in the process. He then appears in the world ten years in the future. Hayato Gokudera also appears and soon realise they are not being sent back after the usual time limit. They are then attacked by Lal Milch who is later revealed to be an ally. English

Tsuna and Gokudera venture with Lal Milch in the woods. They come across a machine dangerous called a Mosca Robot. The future Takeshi Yamamoto defeats the robot and leads them into the hideout where they find out the truth and the secrets. There, Tsuna meets Reborn.

Tsuna, Gokudera and Yamamoto goes out of the hideout and to the outside. They try to find Kyoya Hibari but run into Lambo and I-pin protecting Haru Miura and Kyoko from two Millefiore Family members from Blackspell. Just as Future Takeshi Yamamoto is about to defeat them, a cloud of purple smoke appears and the past forms of Takeshi Yamamoto, Lambo, I-pin, Haru, and Kyoko appear.

Yamamoto is knocked unconscious by the Millefiore members while trying to protect everyone. Gokudera uses his ring and opens his box weapon to reveal a cannon. He defeats one of the Millefiore members. While protecting Kyoko, Tsuna manages to defeat the second Millefiore member by using his Zero Point Break Through technique.

While recovering from his injuries, Tsuna learns the only way to return to the past is to gather the guardians, defeat Byakuran and eliminate the man with the glasses, Shoichi Irie. Lal-Mirch teaches Tsuna, Yamamto, and Gokudera about the rings and boxes; The rings are revealed to emit a flame depending on the element of the user and boxes contain weapons or animals enchanted by those flames. Lal Mirch asks Tsuna to open a box of an unknown element as the sky flame is able to open boxes of all elements.

Tsuna manages to open the box given to him by Lal Mirch to reveal an Arcobaleno Pacifier, but made of stone. When the base receives a SOS signal, it is found to be from Hibird. Kyoko is also revealed to have run away from the base in search of her brother in the future.

Tsuna and Lal Mirch search for Kyoko while Gokudera and Yamamoto search for Hibird. As they are searching, Gokudera and Yamamoto encounter Gamma, one of the Six Funeral Wreaths of the Millefiore Family. Gokudera decides to fight Gamma alone without Yamamoto's assistance.

Tsuna and Lal Mirch manage to find Kyoko at the house of the future Hana Kurokawa. During the fight with Gamma, Gokudera is almost killed but saved by Yamamoto. Settling their differences, they decide to work together to defeat Gamma. Yamamoto is knocked unconscious during the battle

As Gamma is about to deliver the finishing blow to Gokudera, the future Hibari arrives to save him. Hibari manages to defeat Gamma with his hedgehog box animal and tonfas, both which are enchanted with the cloud flames.

When the battle is over, Hibari shows Tsuna and the others the entrance to his base which is also connected to the Vongola base. Once everyone returns to the Vongola secret base, Bianchi and Fuuta arrive to give new information on the Millefiore Family. They reveal the location of the Millefiore base on Japan which is under the Nanimori Station underground Shopping Mall. They decide they must train before beginning their attack on the Millefiore.

When I-Pin becomes sick, Kyoko and Haru decide that Haru should bring her to a doctor. Haru manages to sneak away from the Millefiore and visit a doctor. Haru is later noticed by one of the Millefiore members. Bianchi arrives to try and assist Haru but they both become cornered by the Millefiore member and his box weapon of bees. Tsuna later arrives and defeats the Millefiore member by using the Zero Point Breakthrough.

Lambo sneaks out of the base when Fuuta goes out to fix a loose cable. Lambo is captured by a Millefiore member who demands the location of the Vongola base. Lambo uses him to his advantage in order to get some candy. After learning of the kidnapping, Tsuna and Fuuta follow a trail of Lambo's candy and find the Millifiore member with Lambo. As Tsuna gains the upper hand in combat, the Millifiore decides to threaten Tsuna with Lambo's life. Afterwards, Hibari, annoyed by the disturbance in Nanimori, easily defeats the Millefiore member

Tsuna's training with Hibari begins. During their battle, Tsuna is trapped enclosed by Hibari's hedgehog box weapon. Hibari reveals Tsuna will die from lack of oxygen if he does not escape. Tsuna, reaching his limit, prepares one final attempt to burn through the hedgehog. He burns a small portion and realizes that small portion is where the Vongola ring was. He realizes his X-Gloves flames must be equal to the Vongola ring's flames to break through. Tsuna collapses from the lack of oxygen. Just then, Tsuna's Vongola ring emits images to Tsuna's head and reveals the past crimes of the Vongola.

Yamamoto and Gokudera begin their training. Whilst Tsuna is in the spike ball, he has a visions of all the Vongola Bosses and their past wrong doings. The bosses demand Tsuna to accept the history of the Vongola but Tsuna refuses. The first Vongola Boss, Vongola Primo, accepts Tsuna as the successor to the Vongola. Tsuna then escapes with the help of his upgraded X-Gloves which now emit the sky flames. Continuing their battle, Tsuna grabs one of Hibari's hedgehog box weapon and releases it on Hibari. Meanwhile, Chrome is shown to be inside an abandoned building.

Hibari decides to let Tsuna live, wanting to fight Tsuna when he is finished training. The history of boxes is explained thoroughly by Hibari. Whilst explaining, Bianchi is also explaining everything she knows to Gokudera. It is said that the boxes were made because of coincidence and sold at extremely low prices. There are more than three hundred designs. Meanwhile, Byakuran reveals the 7³ plan; the 7 Mare Family Rings, the 7 Arcobaleno's Pacifiers and the 7 Vongola Family Rings that will give them the ultimate power. Squad 8 is sent to investigate deaths in Japan.

In this episode, Tsuna and Yamamoto learn about Gokudera's past. It is revealed that Hayato is an illegitimate child, born of Bianchi's father, the head of their mafia family, and a famous pianist. It is revealed that she died in a car crash when Hayato is still young. Hayato doesn't find out that she was his mother until years after the crash, but when he finds out, he runs away from home. After learning Hayato's history Glo encounters the past Chrome.

Glo Xinia immediately attacks Chrome, who is in a state of panic and confusion due to suddenly being transported 10 years into the future. Just as the battle seems to be over, in Glo's favor, it is suddenly revealed that the Owl weapon that Glo has been using is actually possessed by Rokudo Mukuro.

With no escape routes available, and Mukuro Rokudo being in a weakened state, Mukuro explains to Chrome Dukuro that it is up to her to win the fight. Drawing power from both her trust in Mukuro and the Vongola Ring, Chrome's illusions become far more effective, to where even Glo can't tell whether or not they are real. The fight soon concludes in a victory for Chrome, and the future Ryohei is introduced at the very end of the episode.

Chrome is brought back by Ryohei to the Vongola Hideout, and delivers the message to the surviving Vongola family members—including the Varia—along with several Alliance families, are planning to attack the Millefiore family in just five days. With the 7 Guardians finally reassembled, it is up to Tsuna to decide whether or not they will participate in the attack.

Due to the Dellinger Phenomenon, the sun has interfered with all signals and has caused technical difficulties worldwide. Because of this, the defenses within the hideout are turned off and the setting becomes dangerous. Reborn explains a little about the Negative Tre ne Sette rays and how the Arcobaleno are affected, and he fears for Lal's life because she is a defective Arcobaleno. She seems to be affected more than Reborn. Meanwhile, Lambo and I-Pin have gotten themselves stuck inside the second power supply room and become blocked in when the backup defenses are turned on. Lambo has destroyed part of the control and the room suddenly becomes dangerously overheated. Finally, it takes Tsuna in his Dying-Will Mode to open the doors and release the children.

The incident that Lambo caused comes to an end, and Tsuna and the others begin their training again. Lal suddenly orders Tsuna to watch everyone else's training. Tsuna is confused, but first goes to Yamamoto's place. When Tsuna peeks into the training dojo to see how he is doing, he sees Reborn and Yamamoto's harsh training. Yamamoto has yet to produce results, and Reborn is treating him harshly. When Tsuna goes to the Storm Room to check up on Gokudera, only Bianchi is there…

Chrome's condition has been stabilized after Hibari tells her it is her duty to live as the Mist Guardian. She uses the Vongola Ring and creates incomplete organs, barely enough to keep her alive. Tsuna, after examining the situation, tells them the raid will begin in five days.

Tsuna apologizes to Haru and Lambo and thanks to them, figures out that behind power, is support. Tsuna tries to release a "hard flame" with "soft flame" supporting him, but fails because he can not find the balance. While unconscious after blasting into a wall, Tsuna and Chrome are sent dreams by Rokudo Mokuro of a strange white "machine".Gokudera has finally mastered the Systema C.A.I. and finding a small cat in one of the boxes.

Gokudera's kitten box weapon dashes off and Gokudera makes chase. Recaps of Goukerdera and Tsuna in the future arc starting with episode 74.

Byakuran calls Irie and tells him that Mukuro has been defeated and that he was found to be transmitting data, possibly to the Vongola Tenth. Byakuran tells Irie that he is the most important person in that base and must escape if they invade the base. Irie for some hidden reason, can't leave. Irie calls all the Milliefore Japan members in the base and tells them he shall be leading the base now. The members are outraged and prepare to attack Irie until a swordsman by the name of Genkishi tells them anyone who opposes master Irie will be killed. Irie becomes the boss of the base. Afterwards the Vongola have received the data transmitted by Mukuro. In it was the picture of the white box Tsuna saw in his dreams. Training is resumed and Reborn gives Yamamoto a box about the sword emperor.

Yamamoto watches DVDs of Squalo's battles swordsman in order to learn from them. Tsuna's training with Hibari continues, this time, he tries to use his Vongola Gloves to fire off flames. Yamamoto manages to create a tenth technique for the Shigure no Shouen Style. Yamamoto's training is complete.

Yamamoto and Gokudera have finished their training. Meanwhile, Tsuna loses his charm made by Kyoko. Later, he bumps into her and she gives him it back, then the first black spell battle is recapped. Also, Hibari reveals that the Millefiore battle simulation reveals a 0.0024% chance of success for Vongola. Thanks to Glo Xinia, Millefiore now knows where the Vongola Base is.

Tsuna and the others prepare for their attack the next day. They've been given Marmon covers on their rings which will hide them, dying will resistant clothing, and a communication system. Meanwhile the Millefiore digs their way underground and ends up at where the transmitter was. It turns out Hibari noticed the transmitter and carried it there to lure the Millefiore members away from the base.

Hibari starts knocking the Millefiore members unconscious one by one. The place he lured them to is revealed to be meant for attacks like this. The Vongola find out that one of the shopping malls ducts lead to the Millefiore base. They enter the ducts only to trigger a trap where lasers prepare to fire on them.

Tsuna and the others escape the ducts by breaking it open and falling to the ground below. There they face Dendro Chilum. Tsuna defeats him with the X Burner and they continue in the Millefiore base undetected.

They continue on and encounter GingerBread, a young boy who asks them whether they are after him for revenge for their friend, Colonnello. Lal Mirch battles GingerBread but is severely injured in the process.

GingerBread reveals that Colonnello died by saving Viper who then killed himself out of hopelessness. Lal Mirch remembers back to the past before she becomes an incomplete Acrobaleno because Colonnello took her place. She had a blue incomplete pacifier which she promised not to use so she would become human again. In the present time, Lal Mirch uses her pacifier and defeats GingerBread. It was revealed GingerBread was a doll and explodes, injuring Lal Mirch. Just then the alarm goes off informing Millefiore of their presence.

To avoid being trapped by Millefiore, Lal Mirch volunteers to distract them. Tsuna volunteers in her place since he is the most mobile with his X-Gloves. The team make their way deeper into the base while Tsuna battles Moscas. He is overpowered and gets dragged underwater.

Tsuna escapes from the grasp of the Moscas and continues his battle. He defeats them the minions but the man named Spanner who pilots the King Mosca remains. Tsuna prepares to give up the fight but Reborn tells him he should use the X Burner in the air. Tsuna defeats the King Mosca but loses consciousness in the process. Spanner leaves the Mosca and prepares to kill Tsuna.

Tsuna's family become worried at the amount Tsuna is gone while they continue searching the base. While crawling through an air duct, they run into Baishana and Nigella fighting. Nigella is then beaten by Baishana box weapon, a snake covered in storm flames. Ryohei decides to fight in place of Yamamto and Gokudera and summons his box weapon Kangayuu, a Kangaroo. Back at Tsuna's scene of the battle, Tsuna and Spanner are nowhere to be found.

Tsuna awakens to find himself a captive of Spanner. Spanner tells him he has covered up Tsuna's whereabouts by reporting him as missing to the Millefiore. Meanwhile, Ryohei continues his battle but now in the air as Kangayuu shoots out boots that propel him into the air with the sun flames.

Ryohei defeats Baishana and his box weapon with a move called "Maximum Ingram". Back at the Vongola hideout, Haru is worried about Tsuna and Kyoko is worried about her brother. Ryohei, Gokudera, and Yamamoto continue their way into the base but suddenly the base starts to move.

The base is moved by Irie Shouichi and Ryohei and Gokudera are separated from Yamamoto and Lal Mirch. Ryohei and Gokudera then run into a white spell Millefiore member who uses his box animal of a slime monster to attack them. Gokudera is trapped inside but is then freed by Uri. He then destroys the box animal. Meanwhile Yamamoto with Lal Mirch wanders into a room and is surprised by what he sees.

Yamamoto ends up in a room full of pipes. There he meets a white-spell Millefiore member who uses a boomerang with the storm flame to attack him. Yamamoto realizes that he could not predict where the attacks are coming from because he is actually fighting twins. Yamamoto defeats them. Irie Shouichi moves the base again and Gokudera and Ryohei run into Gamma.

Ryohei ties up Gokudera with a box weapon to make the battle fair against Gamma. Tsuna meanwhile attempts to escape from Spanner but Reborn who is able to get in contact with him after the base moves closer to the surface, tells him he needs to master the X-Burner or he can not defeat Millefiore. Ryohei is severely injured by Gamma. Hibari continues his way in the subway, surrounded by Milliefiore members once again.

Ryohei manages to heal himself and continues his battle with Gamma. He is however defeated by Gamma's Electric Tower technique. Gokudera is free from the ropes and reveals his Sistema C.A.I.

Gokudera talks about his Sistema C.A.I. and explains how he discovered its use. Hibari continues his way into the subway and uses his box weapon to trap the Millefiore members on the other side. Spanner explains to Tsuna that he will create contact lenses so Tsuna would be able to measure his flame power on his gloves and help him balance his X-burner.

Gamma manages to open a box to unleash his box animal powers, turning his foxes black in color. Gokudera is defeated, but Gokudera's box animal Uri comes out of Kangayuu's pouch charged with Sun flames as a lepord to defend him.

It is revealed the Sun flames from Ryohei's box animal was used by Uri to transform. Uri manages to hold back Gamma's box animals while Gokudera deals with Gamma. Meanwhile, Gamma remembers when his family was separate from the Millefiore. In his memory, the boss just died, and her daughter Yuni is the heir.

In Gamma's memory, after a failed bargaining with the Millefiore Family, Genkishi returns with injuries to the Giglio Nero family. Yuni decides to meet with Byakuran to prevent any more of her subordinates being hurt. After meeting with him privately, Yuni returns emotionless and a loyal servant to Byakuran. Gamma mentions how Genkishi was the biggest traitor to the Giglio Nero Family and how he wants to defeat Byakuran.

Lal Mirch recaps what has happened during their invasion of the Milliefiore base up to the point Gokudera's and Gamma's battle.

Tsuna needs to be placed in battle so the contacts can be adjusted for the X-burner. Tsuna puts on gears that puts him in a virtual space to fight Moscas; he could die if he dies in that space. Later, Irie Shouichi moves the base again and places a virus in the virtual space and Tsuna must defeat it.

Yamamoto runs into the same black spell member Nosaru. Meanwhile, Tsuna after a long battle defeats the mysterious Ultimate Cube. Yamamoto in his battle manages to push back his enemy and the base is moved again.

Tsuna's contacts are completed and Tsuna waits for the contacts to adjust. Iris and Gingerbread investigate Spanner and suspect him of harboring Tsuna. Yamamoto ends up in a room of water and faces the strongest soldier of the Millefiore, Genkishi. Genkishi reveals that he faked his defeat against Squalo for the purpose of Milliefiore. Back at the Vongola base, Kyoko and Haru are trying to find the missing Chrome, Lambo, and I-pin.

Yamamoto and Genkishi continue to battle, until Yamamoto's sword appears cracked. He then remembers in the video Squalo sent him of Genkishi, that he mentioned mist illusions have gotten to the point it can trick everyone in the surrounding area and even cameras. Meanwhile, Gingerbread and Iris continue searching for Spanner. Yamamoto realizes that Genkishi created the illusion of his sword being cracked and continues their battle.

Chrome was revealed to have impersonated a person in the base. Yamamoto is defeated by Genkishi who reveals the room they were fighting in had steel walls covered by the mist causing Yamamoto to run into one of them. Gokudera and Gamma unleash their final attack.

Gokudera and Gamma finish the battle destroying the battlefield. Meanwhile, Reborn and Tsuna figure out that the circle machine was created by Irie Shouichi for time travel causing them all to be stuck in the future. Iris arrives finding Spanner's hiding place. Genkishi about to deal the final blow to the unconscienced Yamamoto, but is intervened by the arrival of Hibari.

Hibari and Genkishi match each other blow for blow. Meanwhile, Iris gives her death squad a power boost. Another squad team is sent to defeat Chrome, but her illusions of Yamamoto, Gokudera and Ryohei defeat the squad. Hibari is about to use his last 3 rings.

Hibari use his last 3 rings for Reverse Neddle Sphere. Iris's death squad attacks Tsuna and Tsuna fights back which defeated 2 of 4 of Iris's death squad. Hibari from the past comes to the future.

Genkishi finds the Hibari from ten years past in Hibari's place. Meanwhile, Tsuna is still fighting the Deathstalk squad and is having difficulty due to Iris propagating her squad. Gingerbread also, arrives to aid Iris against Tsuna.

Chrome finds Gokudera in the ruins of the battlefield. Meanwhile, Tsuna continues his battle with Iris and Gingerbread. Spanner completes the contact lenses which then allows Tsuna to use a full powered X-Burner aimed at Gingerbread and Iris.

Tsuna defeats Iris and Gingerbread with his X-Burner while destroying three rooms in the process. Meanwhile, Genkishi was about to kill Hibari when the others manage to arrive to Hibari's location and save him. Hibari mentions he's learned how to use the ring from Dino in the past and ignites it. He then uses the flame to release his hedgehog box weapon.

When Hibari opens his original hedgehog box weapon, the hedgehog starts to act drunk from the amount of flames from Hibari's Dying Will given to it. After accidentally poking Hibari's hand, the hedgehog becomes mentally shocked and goes out of control. It rapidly starts to grow, endangering all those around it. Meanwhile, Tsuna heads toward the lab with Spanner in tow.

Tsuna flies through Merone Base with a mission to find Shoichi Irie and the white, round device in his laboratory. Irie tries to interfere with Tsuna's movements by moving Merone Base's blocks. With Spanner behind him, Tsuna cannot shake off a homing missile by increasing his speed, but he is saved by Spanner's modified chaff and flame shots. Tsuna is later intercepted by the Phantom Knight, Genkishi.

Genkishi engages Tsuna in a battle using his hell ring, an armour and a special sword. Tsuna is at a disadvantage as he does not have much energy left due to firing the X Burner few times before. However, Genkishi wavers when Tsuna's resolute eyes reminds him of Uni. Tsuna then sets up a plan to absorb Genkishi's flames, and he regains his energy. Tsuna gains the upper hand and manages to overpower Genkishi.

Genkishi recalls a certain memory of when he had been ordered by Byakuran to annihilate the Giglio Nero Family but was too intimidated by Uni's eyes to do so. Genkishi tries to gain even more power from the ring in order to make up for his blunder and transforms into a skeletal figure, which then shoots out illusions he claims that are linked to the actual guardian souls. However, Tsuna sees through his scheming plots and prepares to fire a full powered X Burner.

Tsuna unleashes a full powered X-Burner and defeats Genkishi. In the wreckage, Tsuna finds Irie Shouichi's white round machine. Irie appears and reveals he's holding all of Tsuna's friend's hostage in a tank. Irie reveals the white round machine holds the older Tsuna and the others. Irie reveals he sent them to the future in order to obtain the Vongola Rings. He demands Tsuna to hand over his Sky Ring or his friends will be killed. The Cervello counts down the time limit for Tsuna to make his decision.

Shouichi tranquilizes the Cervello before they could kill Tsuna's friends. He reveals he is on the Vongola's side, and that all the events that have occurred was a plan devised by Shouichi along with future Tsuna and future Hibari in order to train their past selves to defeat Byakuran. Shouichi reveals that the next step of the plan will depend on the Millefiore base invasion in Italy, which is led by the Varia.

The Varia split up into three groups, Squalo, Lussuria with Levi, and Bel with the new illusionist member of Varia named Fran. Squalo meanwhile finds out Xanxus is displeased with his meal and sends injured soldiers to him. He meets some Milliefiore members and defeats them with his Shark box weapon named Grande Pioggia. Bel and Fran run into Milliefiore members and Bel easily disposes of them with his box weapon Storm Mink. Just then, Bel's butler from his childhood, Olgelt, reveals that Bel's older twin brother, Sil is alive. Sil then appears on a flying throne.

Sil is revealed to be one of the Six Funeral Wreaths. Bel, Fran, Olgelt, and Sil release their box weapons for battle. Sil's box weapon is revealed to be a Storm Bats with the ability to fire invisible sonar waves enchanted with storm flames; The storm flames when in contact with something causes an explosion. Bel and Fran are defeated. Olgelt sends his Rain Elephant and destroys the castle the Varia invaded. In the remains of the castle, an unharmed Xanxus on his throne is seen drinking wine.

The corpse of Bel and Fran are revealed to be illusions of Fran, who wanted to see whether Sil or Xanxus is stronger. Olgelt sends his Rain Elephant after Xanxus but they become petrified in mid-flight. Xanxus' Sky Lion box weapon, Besta, is revealed to be the one petrifying the Elephant. Sil attacks Xanxus with his storm bats causing heavy damage to him. Xanxus unmoving from his throne becomes enraged and reveals Besta is actually a Sky-Storm Liger, an offspring from a Sky lion with a Storm tiger.

Xanxus returns Besta to his box, warning Sil that when he releases Besta, he will be finished. Xanxus demands Sil to call Byakuran. Sil refuses and attacks Xanxus with his Storm Bats. Xanxus releases Besta and defeats Sil. Tsuna and the others receive news that the battle in Italy was successful. At that moment, Ryohei from ten years ago arrives from the past. Shouichi opens up the white capsule containing the ten years later version of Tsuna and his Guardians and gives Tsuna the Vongola Box from his future self.

Shoichi Irie tells Tsuna that in order to open the Vongola Box, the Seven Arcobaleno Seals are needed. In order to obtain the seals, Tsuna needs to overcome the Arcobaleno trials. To do so, Irie will momentarily send everyone who came from 10 years ago back home. Chrome Dokuro asks Irie on Mukuro Rokudo's status and Irie reveals that his death was not confirmed. Tsuna and the others return to the Vongola base where they are reunited with everyone else. At the base, Ryohei Sasagawa is filled in on the events that have occurred and Tsuna thinks how he should tell Kyoko and Haru about this and whether they could return to the peaceful days again.

The battle for the rings has ended and Tsuna is enjoying the peace. Reborn suggests that they have an out-of-season "test of courage." Tsuna doesn't like the idea at first, but he learns that Kyoko is participating and becomes eager to pair up with her. But when he gets to the graveyard, all the participants, besides him and Lambo, are doing the scaring. Tsuna is disappointed, but doesn't want to look like a coward in front of Kyoko. He decides to go into the creepy graveyard with Lambo. The two get separated, and when they meet again, Lambo has switched places with Adult Lambo. But for some reason, there's something a little different about Adult Lambo

It's Open House! Tsuna is poor at studying, and for him it’s just a day of terrible experiences. He’s hit with a question he doesn't know the answer to and opens his mouth to give a random answer, but his tutor, Reborn, won't allow that to happen. Reborn is watching from behind the parents to see that Tsuna gets the answer right. But then Lambo and the others come barging in! In the end, the teacher has to leave to carry off Gokudera after he passes from seeing Bianchi. The classroom is unsettled. At that moment, a certain man stands at the front of the class!

One day, Tsuna receives an invitation to a wedding ceremony. The names of the bride and the groom are Bianchi and Reborn! It seems that Nana found her wedding pictures the other day, which made Bianchi crazy about getting married. At first, Tsuna is sure that Reborn would never consent, but when he sees Bianchi in a wedding dress at the church he realizes the ceremony is real. Tsuna goes to the groom's room to congratulate Reborn, but he learns the surprising truth from Dino!

Nana's wallet has been stolen. Angered about dinner, Reborn and the other freeloaders step up to catch the thief. Naturally, Tsuna is dragged along. The Sawada family walks through the shopping district with guards around Nana. The group grabs the attention of three men, the Crime Brothers, who are causing a stir in town. The youngest brother was the one who stole Nana's wallet the day before!

Lambo is beat up by Reborn as usual and is tossed into a neighboring house. The boy living there, Shoichi Irie, goes to the Sawada household to return a box that contains a gifts of thanks from the Bovino Family, the family that Lambo belongs to. But unusual things begin to happen! A beautiful woman sunbathing out of season, a talking baby, an exploding child, and a suspicious black luxury car… Shoichi Irie is confused by the strange happenings and has no chance to return the box.

A dojo buster has appeared in Namimori. Kyoko and Haru see him in action and are angered at how merciless he is, even against children. They are frustrated that they aren't able to do anything. Reborn tells them that Tsuna will defeat the dojo buster for them. Naturally, Tsuna doesn't want to. But when he sees Kyoko's sad expression, he is unable to refuse and begins training. The name of the technique that Reborn is trying to teach Tsuna is called the "Absolute Evil Fist." But for some reason, Reborn won't tell him what kind of fighting style it is

Nezu is a terrible teacher who makes fun of students who get bad grades. On the day he has to return his students’ science tests, he shows the entire class Tsuna's answer sheet, which has received poor marks. Gokudera is angered at Nezu for making fun of Tsuna and confronts him, but Tsuna and Yamamoto stop him from causing any physical harm. Nezu falls over and is angered; he blames Tsuna and his friends for his injuries. He says that they should be expelled. Thanks to Kyoko's pleading, Nezu will forgive them if they retake the science test and get good scores, but…

Everyone suddenly receives an invitation from Reborn to attend a Vongola-style Maman Appreciation Day party. Reborn is holding this event to entertain Nana, who is always taking care of everyone. But with a name that includes “Vongola-style,” it can't be normal. At the party, Nana selects a winner by giving points to people who reveal their secret talents. The chances that the winner's wish will be granted is, amazingly, 100 percent! Everyone wants their wish granted, and the Sawada family living room becomes a place for serious battle with greed swirling all around.

On a day out having fun, Tsuna and his friends come across a boy using the Dying Will Flame and is being attacked by a swordsman, but when they try to help, they prove to be no match for him.

Dino manages to fend off the swordsman, Squalo, and explains the situation: a subgroup of the Vongola Family called The Varia is after the Vongola Rings which are held by the leading members of the family, which he then proceeds to give to Tsuna and six other people. They have ten days to train in order to become strong enough to fight off The Varia. Meanwhile, Tsuna's father returns.

Tsuna and the other six members chosen to hold one of the 7 half rings, all start to train, in preparation to face The Varia. Some even get themselves their own home tutors. Meanwhile Tsuna is told that besides him the First Vongola also used gloves, and he will soon find out who the two others with the ring are.

All of them are going through training by their respective tutors. Tsuna is being trained by Reborn, Yamamoto by his father, Gokudera by Dr. Shamal, Ryohei by Colonello and Hibari by Dino.

Under Reborn's instruction, Tsuna embarks on a search to find the missing Lambo. At the same time, Haru is testing Tsuna to find out whether he is still the kind and compassionate Tsuna who had saved her in the river.

A Vongola weapon alteration expert shows up to improve everyone's weapon. Meanwhile, two men appear, aiming to assassinate Tsuna.

All of the selected one are forced to battle against each other who have the same type of rings.

Lussuria and Ryohei fight in a heavily lighted boxing arena. Ryohei is being beaten severely by Lussuria but then Ryohei remembers his sister and the reason he became a boxer. He then gets back up ready to fight.

Ryohei continues his fight with Lussuria. When the battle seems to favour Lussuria, Kyoko & Hana appear and give Ryohei the support he needs to release his Extreme Sun Maximum Canon. Later, Tsuna wonders if Lambo can really fight in the next round. Tsuna then talks with Lambo from 10 years later who tells him not to let 5 year old Lambo use the 10 year Bazooka, for Adult Lambo may be from a future parallel world.

Lambo's fight versus Levi A. Than of Varia. As a 5‑year-old and a 15‑year-old, he stands no chance to the "Levi Volta" attack of Levi. However, when the 15‑year-old Lambo used the 10-year bazooka, Lambo from 20 years later appears. The 25-year-old defeats Leviathan with relative ease using his "Elettrico reverse" and "Elettrico Cornata" techniques, but the 5-minute limit of the 10 Year Bazooka ended, and Lambo reverted to his 5-year-old form. Just as Leviathan is about to severely injure Lambo, Tsuna stops the match in Hyper Dying Will Mode, surprising everyone.

Tsuna's ring is taken from him for having interfered in Lambo's fight. Tsuna's father leaves for Italy, after Xanxus hints at having done something to the 9th boss of Vongola. While Tsuna continues his training, Gokudera is trying to perfect his ultimate technique.

Gokudera fights a losing battle to Belphegor. Belphegor's attacks were somehow going right to him without much effort on Bel's part. However, Gokudera figures out the secret to his trick, and unveils his new technique: Rocket Bombs. However, once Gokudera finally strikes Belphegor, he starts to act strangely.

After Belphegor reveals his true nature, Gokudera lures Belphegor into the library for a final stand. After a brief struggle between the two, Gokudera won, but as the time limit for the match expired, it became a struggle match for the two. Not wanting to lose his friend, Tsuna persuaded Gokudera to abandon the ring. Gokudera's match concludes

The battle for the Ring of Rain between Yamamoto and Squalo is announced. Hibari causes a commotion at the school as the battles have caused major damage to the grounds. Dino reveals that Squalo once defeated the Swords Emperor of the old Varia and that Yamamoto's Shigure Souen Style is useless against him. Yamamoto receives a shinai from his father that transforms into a katana only when using the Shigure Souen Style.

The battle for the Ring of Rain commences. Yamamoto shows off his new Shigure Souen Style and it looks like victory is assured. But slowly Squalo gains the upper hand as none of Yamamoto's attacks are hitting. He then reveals that he can read through all of Yamamoto's moves.

Having crushed the Shigure Souen Style before, Squalo becomes confident once more. Yamamoto manages to hurt him with the 8th Form: Pelting Rain, after Squalo revealed he had encountered a different 8th Form. Yamamoto reveals his newly created 9th Form as Squalo bares his fangs. The Shark and Rain collide on this exciting conclusion.

On Tsuna's side of the world, he is curious to know who is the Guardian of the Mist only to faint at the sight of Chikusa and Ken. At the Vongola Compound in Italy, an attempted recon mission is enacted by Iemitsu to find out what happened to Vongola the 9th. When Tsuna regains consciousness, he and his 'family' find out who is really the Guardian of the Mist.

Having found out that Chrome Dokuro is the Vongola's representative of Guardian of the Mist, Tsuna acknowledges her as a part of the family and allows her to take part in the duel. After many exerted attempts to attack 'Mammon' (now known as Viper of the indigo pacifier), Chrome eventually loses to the illusions. However, the battle does not end and an unexpected person comes in to assist in the battle.

The unexpected person, turned from Chrome, turns out to be Mukuro Rokudo. A series of chaotic illusions battle starts. During the fight, Tsuna experiences flashbacks of Mukuro on how he sacrificed himself for Ken and Chikusa to escape. Mukuro ends up being the winner, almost killing Mammon, who escaped from the battle field with his reserved power. Mukuro fainted after the battle, turning himself back to Chrome.

Everyone in Tsuna's family is worried about the outcome of the Cloud battle. If it's Hibari that's fighting, then they should have a one-hit K.O. no-worry win. However, when it seems that the daunting Gola Mosca is more than he appears to be, even Tsuna, who's still training to complete his Zero-Point, gets very worried.

After the Cloud ring conflict, Xanxus tries retrieve Gola Mosca. After Hibari halts his attempt at retrieval, Mosca goes on a rampage, shooting wildly at everyone friend and foe. Back at the 9th's house it is revealed that the 9th living there is in fact a fake. Tsuna comes to the rescue of his friends and holds off Mosca at which time Mosca attacks Tsuna only.

Tsuna opens Gola Mosca to find the body of the 9th who was its power supply. Xanxus is revealed to have been behind a coup attempt. It is revealed that Tsuna has met the 9th before and that he was the true choice for the position of the 10th Vongola Boss. After which the Sky Match is announced for the next night. Xanxus gives the sky ring to Tsuna before he leaves. The 9th is taken for medical attention and everyone returns home. Tsuna returns to school the next day where he receives an amulet from Kyoko.

As Lambo wakes up from his coma, Gokudera recounts what has happened during the Varia arc.

Everyone arrives at Nami Middle to find Tsuna and Xanxus about to fight. The Cervello put watches on the guardians that poison them and the only antidote is to put the guardian ring in the watch itself. Just before the fight begins Xanxus makes a decisive first strike.

The Battle of the Sky gets started and the strengths of Xanxus and Tsuna are exposed. Not to mention a couple of the guardians seem to be coming around.

All the Guardians have been injected with a poison and rendered unmovable. Hibari, however, manages to help himself and on the way saves Gokudera. On Xanxus's side, Bel and Levi have also been freed. Gokudera rushes to save a helpless Lambo from Levi. Meanwhile, the Sky battle has begun to heat up.

Tsuna prepares to use the fruit of his hard training: the Zero Point Breakthrough. Xanxus, however, recognizes this attack and proceeds in a hectic beat down. Reborn reveals that maybe using it to attack won't beat Xanxus anyway.

Xanxus is firing relentlessly leaving no time for Tsuna to execute his attack. But Tsuna is getting stronger with each hit he takes due to the Zero Point Breakthrough Revised. Meanwhile, Hibari has saved Yamamoto and Gokudera freed Ryohei. Tsuna's family are all saved. Dino arrives at the battle with an unexpected guest and Chrome is being held hostage by Marmon and Bel.

Dino's unsuspected guest is revealed to be Squalo, who Dino saved instead of Yamamoto and brings to see the sky match. Yamamoto along with Gokudera propose a trade between Mammon and Bel, which turns out to be a well played trick but is countered by Mammon's illusions which binds both Yamamoto and Gokudera, Gokudera of which drops the remaining rings. Tsuna and Xanxus have a struggle where Xanxus powers up, which seems to turn the tide of the battle. Tsuna and Xanxus then charge at each other which results in a huge explosion. After the smoke clears, Tsuna's Zero Point Breakthrough froze Xanxus's hand; revealing he has mastered the First's technique.

As the fight continues, Xanxus tries to break the ice and release his flames. However, Tsuna prevents him and begins to freeze Xanxus' entire body. As Xanxus becomes frozen, he reveals that this scenario is similar to when the 9th Vongola froze him. Squalo finally reveals the whole story of what happened 8 years ago during the "Crib Incident" and how the Varia attacked Vongola headquarters but failed due to the freezing of Xanxus. Meanwhile, Ryohei is shown freeing Gokudera, Yamamoto and Chrome from Mammon and Bel's trap. However, Mammon was able to get all the guardian rings and is seen at the end hovering over the frozen Xanxus saying that all the rings will reawaken Xanxus.\

After the fight, Xanxus is released with the power of the 7 rings which he was originally released by from the 9th. There is a short flashback of his life, and a secret is revealed: Xanxus is not actually the 9th's blood son, and so, the rings rejected him. At the end of this, an elite group of Varia arrives.

Due to the timely arrival of Lancia,the elite group of Varia are defeated and Tsuna is pronounced the winner of the sky ring. They celebrate with a party at Yamamato's house.

A strange infant, Reborn, claiming to be a hitman for the Mafia approaches Tsunayoshi "Tsuna" Sawada. To Tsuna's dismay, he has just been chosen to become the next Vongola boss.

Since Reborn's arrival, Tsuna begins to meet new and strange people. One of those people is Hayato Gokudera, a Mafia member who wants to kill Tsuna in order to become the Vongola boss. Meanwhile, Tsuna is forced to help the volleyball team, including his friend Takeshi Yamamoto, due to his show of strength in the previous episode.

Bianchi is an assassin who believes that love conquers all. So, in order for her love to reach Reborn, she attempts to kill Tsuna to free Reborn's schedule. Meanwhile, a young assassin named Lambo comes after Reborn.

A strange girl, Haru, is seen stalking Tsuna. In fact, Haru is actually trying to follow Reborn. In order to "free" Reborn, she tries to drive away Tsuna by force.

Just when Tsuna is adjusting to his new life, his school's delinquent leader, Kyoya Hibari, is now targeting Tsuna. Fortunately for Tsuna, Hibari is more interested in fighting Reborn.

A strange Chinese infant, I-pin, comes to Japan in order to kill Tsuna.

Tsuna finally meets Kyoko's older brother, Ryohei, but things don't seem to go the way he wanted when Ryohei nags Tsuna to join the boxing club.

Reborn's former student comes to Japan to visit Tsuna; Dino teaches Tsuna what it means to be a Mafia leader.

Tsuna is suddenly stricken with an embarrassing disease. Unfortunately for Tsuna, the only person who can cure it is a doctor who does not like to treat men.

Lambo is given a simple task of giving Tsuna his lunch by Tsuna's mother, but when he bumps into I-pin, who was carrying a box of nitroglycerin, a mix up causes things turn for the worse.

Tsuna is faced with a dilemma when Haru and Kyoko eat a Gyoza bun that proves fatal to normal people. Even worse, there is only one antidote available.

Reborn strengthens the abilities of Gokudera and Yamamoto through specially made "training programs", which appears to be more than an exercise course. When he discovers that Reborn and Tsuna seem to be paying more attention to Yamamoto, however, Gokudera feels left out.

It's New Years and Tsuna and his 'family' has to battle the Chiavorone Family in a traditional Vongola event. Although, the losing family has to pay a price of 100,000,000 Yen.

Tsuna goes to the zoo with Kyoko, and is glad to finally able to be alone with her. Tsuna's ideal "date" does not go as planned, however, as he runs into his friends in the zoo, who are causing all sorts of trouble.

All of Tsuna's friends show up at school during winter to help him babysit I-pin and Lambo. Although, in a turn of events, everyone besides Tsuna seems to just want to have a snowball fight, so Reborn turns it into another one of his staged competitions.

When Reborn drops Tsuna and his friends off on an isolated mountain, he and others become lost in the wilderness of the mountain.

Tsuna is recovering from his wounds from the previous episode and discovers that recovering in peace and quiet isn't possible with not only his friends visiting, but the fact that Hibari is in the same hospital.

It's Valentine's Day Kyoko and Haru are at Tsuna's house to make some chocolate, only to his horror to find that they are being helped by Bianchi. Tsuna and his friends have to find away to get Bianchi away from them before she ends up poisoning the chocolate.

A small kid named Futa bumps into Tsuna. What Tsuna is not aware of is that Futa is a Mafia informant, whose "rankings" are 100% accurate, and this makes him a widely sought-after target, forcing Tsuna and the others to protect him.

One by one, students at Namimori High are being targeted by an unknown gang. It seems that some of those targets are some of Tsuna's friends, and he has to stop the unknown gang before they attack his friends.

After a battle between Gokudera and Chikusa, one of the gang members; Tsuna, Yamamoto, Gokudera, Bianchi, and Reborn set off to capture and defeat the mysterious gang from Kokuyo, only for Yamamoto to run into trouble right off the bat.

After a quick battle between Bianchi and M.M., Haru and Kyoko have been targeted by the serial killer twins Jiji and Didi under Birds' order. Threatening to kill off the girls, Birds plays with Tsuna and his friends, commanding them to beat Tsuna up.

With Tsuna running after Futa, the others are left to deal with the one claiming to be Mukuro himself. He proves to be too much for them in the state they are in, so all hope lies with Tsuna coming back in time. However, even if he does, there is only one Dying Will Bullet left.

With the reveal that their foe wasn't the real Mukuro, everyone breaks into the Kokuyo Middle School building to face the true mastermind. With no Dying Will, Gokudera having to fend off both Chikusa and Ken, and everyone else unconscious, all hope looks lost, but one of Mukuro's captives my prove to be the ace in the hole.

Even after his apparent death, Mukuro still isn't finished as he possesses the bodies of everyone his hit with his trident. There seems to be no way for Tsuna to win with everyone under Mukuro's control and no Dying Will, when Reborn's pet Leon gives off a strange glow.

With the new Rebuke Bullet, Tsuna has reached a new level of power, but it still may not be possible to defeat Mukuro, who still has not revealed his strongest form.

After the defeat of Mukuro, life goes on normally and Tsuna and his friends all move up a grade at school. However, none of them are in the same class, so Reborn offers them a challenge to catch him, with the prize being a change of the roster. Later, they celebrate at a sushi restaurant owned by Yamamoto's father only to find they do not have enough money to pay for their food and have to work off their debt.

A burglar comes into Tsuna's room at night, with Tsuna fainting from fear, only to wake up in the morning to find him dead. Everyone must find a way to hide the body or else go to prison.

Kyoko's friend Hana is infatuated with Future Lambo and blackmails Tsuna into letting her meet him by threatening to tell Kyoko that Haru is his girlfriend. When Lambo uses the Ten-Year Bazooka, however, something malfunctions and creates a teen Lambo with young Lambo's mind, and to make matters worse, this Lambo escapes from the house.

Reborn invites Tsuna and his mom to a vacation resort, but they first have to ride on a cruise ship to get there. Once on the ship, Tsuna spots some of his friends, who all boarded without tickets, and he now has to keep them from being caught, but first, he has to catch them.

At Mafia Island, Tsuna fails to prove his identity as the Vongola Family's 10th boss, and is transported to the back of the island where he is given a new chance to prove himself. There, he meets another Arcobaleno, Colonello. Colonello and Reborn put Tsuna through tough training. Meanwhile, another Arcobaleno invades the island with an army.

Tsuna has to swim 15m in school, but being unable to swim, he is trained by Yamamoto, Gokudera and Haru in the public pool. Everyone has his own method, and they decide to compete to see who can get Tsuna to swim the furthest. Reborn interferes this time with a Vongola dolphin that has a dangerous complexion.

To pay off the damage caused in the previous episode, Tsuna works as a lifeguard with Ryohei, only for them and the other boys to be challenged to a swimming race by older lifeguards. Later, Tsuna and his friends run a stand during a summer festival to continue to pay off their debt, only to have run ins with Hibari, and a group of thieves.