Michiko (61 years old) has been married to a man she met at a matchmaking party for half a year, and has gotten used to her new life. However, she is not quite able to get along with Seiji, her husband's stepchild, who is of marriageable age... One day, Michiko finds out that her stepson Seiji has a sexual fetish for mature women. Worried about her young son's future, Michiko scolds him for this, but it's her stepson who ends up doing the same... And the 60-year-old mother's unsatisfied body is driven unconscious by the young and intense caresses of her stepson Seiji...