After an affair, Chikako reunites with Ryozo, whom she once broke up with. Although they no longer have a sex life due to Ryozo's age, they live a fulfilling life. One day, Ryozo's son, Yohei, returns from studying abroad in France. He suspects that Chikako is responsible for his mother's illness. Amidst the uneasy atmosphere, a tragedy occurs while Ryozo is out... Unaware that her husband is watching, he is made to climax over and over again by the young cock! A son rapes his stepmother, a stepmother who cannot resist the pleasure of immorality, and a father who secretly watches them...