Yôko Ôyagi

Mitsuko has the sensation of being watched. The feeling doesn't pass. Then, one day, her husband, a jewerly dealer, invites his product-buyer home for dinner and some drinks. Instantly, Mitsuko realizes this is the man who has been spying on her. When the husband gets drunk and dozes off, Mitsuko is raped by this man. (Sex Files Japanese Cinema Encyclopedia)

The lovely Ryoko is attending a Japanese University on an exchange program. She’s pretty, vulnerable, shy, and full of mysterious secrets. Meeting up with her long-time friend Rumiko, Ryoko shuns her aggressive lesbian advances by saying she’s still a virgin. Rumiko is surprised at this revelation and, over the next few days, she takes Ryoko on a series of misadventures to help her with her sexual awakening...

Shizu is a housewife whose husband has just flown to Germany to work in his company's branch office. During her husband's absence, Shizu makes her first fatal mistake with her brother-in-law which leads to other men and her involvement with gangsters, dragging her into a mire from which she cannot escape.