A married couple lives with her father-in-law, who has retired. Michiru, the wife, wanted to have children while she was still young, but her husband Michiru a shocking confession: "I don't like children and I don't want them, so we're not having sex anymore." Michiru can't hide her shock. She gradually becomes attracted to her father-in-law's kindness, who worries about her. At first, the father-in-law is confused by his daughter-in-law's advances, but he can't resist her young and beautiful face, firm breasts and buttocks. From then on, the two of them make love every day and every night, and finally, his daughter-in-law's body...