Saeko Matsushita is a mother with a troubled past; she has been promiscuous since her teenage years, having relationships with countless men, and she doesn't even know who the father of her child is. Because of this, she has distanced herself from the party scene to focus on raising her daughter until she reaches adulthood. The girl, now of age, begins to have a boyfriend and plans to get married. One day, the mother witnesses the two of them making love wildly, their intense moans causing her to reminisce about her own past. The sounds of their passion become unbearable for the mother, and she finds it hard to suppress her feelings until one day.
