Manami and Yuta have been together since their university days, and after graduating they got married after a two-year long-distance relationship. Her husband, Yuta, is the heir to a liquor store, and they began living together with his parents after getting married. When they first met before the wedding, her parents-in-law were very kind, but after living together she gradually became dissatisfied with the difference in values between them and the lack of sexual relations with her husband. Then she meets her husband's cousin, Noriyuki, and gradually becomes attracted to him...