Takashi Shirakawa, the president of Tozai Corporation, is an adopted son-in-law. His wife, Reiko, is sickly and their married life is indifferent. His secretary, Mitsuko Mizukami, who has been having a physical relationship with the president, is an adulterous woman who plans to seduce the president into letting her wife commit suicide so that he can get his wife Meigi's fortune.

A brother who suffers from incest tries to commit suicide with his sister, but the sister dies and only he survives. A man lives with that feeling of guilt... One day, when I helped a girl who was attacked by her thugs, she looked like her dead sister. Moreover, she lost her memory from the shock of being raped. And the strange cohabitation life of a man and a woman begins...