Mao, who is sexless with her husband, is having an affair with another man and is a lewd young wife who enjoys the pleasure of extramarital sex. She is invited to a hot spring trip by a man who wants more excitement, and she devours his erect penis as he tells her to. Mao gradually becomes more aggressive, shaking her big breasts as she seeks the man's body, as if to explode with pent-up desire.