Rin, a married woman, is not dissatisfied with her life, but she feels that her sex life with her husband is not enough. Then, she meets a neighbor. Unable to forget him, she takes the plunge and uses her key to invite him out. The man and woman stare at each other intently. Then, they finally give in to their intense urges. They become immersed in a passionate sexual encounter... When her husband goes on a business trip, their lust explodes!!!