Kana, a young and beautiful wife, remarried and was living happily with her husband Shinji. However, beneath this seemingly happy life lay a dark secret. Shinji's job was extremely demanding, requiring frequent business trips that kept him away from home for long periods. During his absence, Kana found herself committing an indiscretion with her stepson Atsushi. Though she intended it to be a one-time mistake, Atsushi gradually grew increasingly desirous of her body, drawing them both into a deeper and more complicated relationship.