Kyoko Takashima plays Michiko, a happily married milf whose only daughter has grown into a fine young woman, living a peaceful family life with her husband and child. One day, her daughter brings her boyfriend home and introduces him to Michiko before the couple retreats to the daughter's room. Instantly attracted to her daughter's boyfriend, Michiko sneaks into the room and catches them having sex. Overwhelmed by the sight of his youthful, erect cock, she can no longer suppress her arousal. In that moment, Michiko experiences the most shocking sensation of her life.