Yumi, a carnivorous mother, eavesdrops on a conversation coming from her son's room and finds out that her son's friend Jun is a virgin. When her son is not around, Yumi tries to take his virginity, but Jun explodes in an instant. That night, unable to forget the events of the day, Yumi appears in Jun's dreams dressed in a bodysuit. Yumi lectures the completely depressed Jun on the basics of sex. When Jun wakes up the next morning, he feels a surge of confidence and courage in his body...