Masako Ikuta and Shinsuke, married for eight years, go on a long-overdue trip together. During their journey, they encounter the National Milf Search Team, who invite them into an orgy. At a motel, Masako is vigorously fucked by two men, climaxing repeatedly in overwhelming ecstasy. Watching her, Shinsuke is consumed by intense jealousy. After satisfying her pent-up desires, they head to a hot spring town in Izumo, where another middle-aged couple tempts them into more sex, continuing their journey of relentless sexual indulgence.