He is a private home security officer with 20 years of military experience. Exceptionally trained in technology and intelligence gathering, he perceives and records the smallest of details of the home to which he is dispatched. His new assignment is directly from his father, Terao Kareki. He must look after his father's new lover, a potential bride. Nothing but the best professional will do to keep her safe. But in her home, he sees all.

Kareki Tsunetaka is a veteran "Home-Security Officer" of 20 years. One day, his home is encroached upon by the woman his father remarries: Katsuragi Shouko, a former widow with a body too good to be wasted by widowry. Tsunetaka, through his intuition honed from being a home-security officer, deduces that Shouko plans to take over their household. In order to protect his home, Tsunetaka sets his sights on Shouko's younger daughter, Yuki, searching for blackmail material through various surveillance devices. Through constant surveillance, he lays witness to her small yet beautifully formed breasts, unwary glimpses of her inner thighs, and most importantly: her intimate moment with her girlfriend, all caught on camera. With this blackmail material, the home-security officer lays waste to her virginity, plugging her impertinent mouth with his rod, and penetrating deep into her previously untouched areas. The next target... Is the sister, Katsuragi Yuki!

His intuition, honed from being a security officer, makes Tsunetaka realize that Shouko is planning to take over their household. He uses various surveillance devices to find out the three women's weaknesses and make recordings with which to blackmail them. Breasts that bounce heavily with every step, a well-developed ass that likens to a perfectly-ripened fruit, and indecent feelings for a young boy – She plays the part of a chaste wife, but the camera sees this bitch's true colors. Seizing onto Shouko's weakness, Tsunetaka lays waste to her chastity. As he fills her with sperm, the feeling of ecstasy reminds her of what it means to make love. The next target is... the mother, Katsuragi Shouko!!

Kareki Tsunetaka has successfully extorted the weaknesses of Katsuragi Shouko, the woman who Tsunetaka's father remarried, and her two children from her previous marriage – Sayaka, the older sister, and Yuki, the younger sister. To protect the Kareki household from being taken over by the scheming Shouko and to make the house's residents fear him, he sexually assaults them all, daily. Until the day he gets the mother and daughters to move out of the Kareki household, Tsunetaka is committed to his "duties" as a home security officer. In that house, whenever and wherever he wants, Tsunetake makes the three bitches wear assorted costumes and repeatedly violates them. To instill even further dread in his targets, he does not grow lax with surveillance and redoubles his efforts instead. On all accounts, it seems the three women have yielded to his coercion and incessant lust. However, the home security officer fails to notice the suspicious change in the way the bitches look at him.