One day, when her husband Yasuo returned home to retrieve something he had forgotten, he found Satomi having an affair with their son Yoshio. Yasuo was filled with anger, but for some reason his penis, which had been impotent, reacted. That night, remembering the events of the day, Yasuo made a move on Satomi, but lost his momentum halfway through. Disappointed, Satomi went to her son for comfort, who told her, "Yoshio is better than you!"...