Reiko has been married to her husband for two years now. However, her husband has a son who isn't much younger than Reiko, and due to his increasingly busy work schedule, he's been coming home less and less frequently. Even when he does return, he shows no interest in their relationship, leaving Reiko feeling more and more isolated. Amidst this loneliness, Reiko begins to develop feelings for her stepson. As her bond with her husband continues to weaken, Reiko finds herself drawn toward a new, forbidden emotion.