Tanaka Ryouko was born July 28, 1973 in Tokyo, Japan. She is a freelance voice actress (seiyuu), who formerly worked for Pro Fit, Arts Vision and Office Mori.

Isshiki Hikaru is Tanaka Ryouko's adult game alias.

Note: Not to be mistaken with gravure model Tanaka Ryouko (04.08.1984, same kanji).