Chisa, whose desires have been building up due to her busy husband neglecting her, is visited by her husband's younger brother. Taking advantage of his brother's absence, he pressures Chisa into a physical relationship. Confused by the sudden turn of events, Chisa finds that her body, neglected by her husband, responds to her brother-in-law's caresses and she ends up allowing the relationship. From then on, whenever her husband is away, her brother-in-law visits the house. Despite knowing it's wrong, Chisa keeps repeating the act with him. One day, her brother-in-law stops coming over. It's then that she realizes she has been expecting his visits...
