Married woman Yuu, neglected by her husband, suffers from unbearable physical longing every day. One day, while nursing a young man next door who caught a cold, she feels her emotions surge and gives in to temptation, having sex with him. Later, after sending her husband on a business trip, she invites the young man over again and lets him into her room. However, another man is already there—someone Yuu has been secretly involved with. Confused, the young man is drawn in by her advances, becoming entangled in a series of depraved acts.