One day, Takeshi, the son of her husband's brother (husband's nephew), is going to stay at Miho's house for college entrance exams. Miho feels sex appeal to young Takeshi while living together. She hasn't had a night life with her husband for a while, and is dissatisfied with sexlessness, and eventually her desire to "criminalize" grows stronger day by day. And secretly to her husband, she seduces her nephew who is about to take the exam and has a relationship with him. The destination of Miho who repeats secret sexual intercourse is ...