Yosuke Kobayashi, a detective assigned to a homicide unit, saw his wife killed by a serial killer, Shinji Nishizono. From the shock of the incident, he suffers from multiple personality disorder and becomes Kazuhiko Amamiya. Soon after, he manages to hunt down and kill his wife's murderer.
A beautiful young girl intrudes into the life of a married couple and while seducing each of them, she brings pleasures they have never experienced before. To her, it's all a game and doesn't realize the grave consequences it ensues.
