Young Wife: Playful Bondage (1980)
Takao meets a woman with amnesia at a disco. His girlfriend, Miwako, is unhappy when Takao takes her home. Finally, urged by Miwako, Takao tells the woman to leave and goes to university. That night, while drinking with friends, Takao flirts with Kazuki's girlfriend, Yoshiko, ignoring Miwako. The tw