Mesmerized by the morning routine of his son and daughter-in-law, 70-year-old Genzo Yukawa becomes consumed by lewd fantasies that have nothing to do with age. His target is always his son's wife, Izumi. Knowing she moans and cries out in pleasure every single day, Genzo's arousal never subsides. He eventually reaches the point of touching her underwear. This act is inevitably discovered by Izumi, who confronts and scolds him. Yet Genzo's lust remains unabated. Even after apologizing, he retreats to his room to masturbate—only to have Izumi, the woman who should despise him, suddenly appear before him. What happens next defies all imagination…