Ruriko Kanda is a mature woman approaching her sixtieth birthday, living with her son's wife. One day, her spoiled grandson, who never studies and only plays around, comes back home asking for money. Disgusted by his attitude, Ruriko tries to reason with him, but when she sees his thick, powerful cock, her womb aches with desire for the first time in years. As the family's dysfunction becomes increasingly apparent, Ruriko finds herself unable to resist her growing urges, leading her down a path of forbidden passion.