Rin is a married woman who is happy with her life but feels unsatisfied with her sex life with her husband. At that time, she meets her neighbor. Unable to forget him, she takes the plunge and uses her key to invite him in. The man and woman stare at each other intently. And finally, they give in to their intense urges. They become engrossed in a passionate sexual encounter... When her husband goes on a business trip, their lust explodes!!!