Kyoko (Hayashi) lives with her son Hideaki after her husband has died. Mother and child get along well and modestly... Hideaki repeatedly rebelled against Kyoko. Kyoko, who is tired of living with such a son, unintentionally complains in front of her brother-in-law, Shigeru, who was visiting the house. "I can't get along with that girl anymore..." And as if to forget everything, I entrusted myself to Shigeru... A few days later, Kyoko accidentally enters Hideaki's room while he is masturbating. Hideaki's anger reaches its peak and he forces Kyoko...