Yuriko is an ordinary housewife, but she has a secret that she can't tell anyone. That is, she was forced into a physical relationship with her son. Initially, Yuriko thought it would be just once, but her son didn't think so and kept pressuring her, so she gave in to the temptation and continued the relationship. This can't go on, she tried to initiate sex with her husband at night but was rejected with 'I'm tired.' To vent her frustrated feelings, she started masturbating, but was caught by her son...
