When her son's friend Toa comes to stay overnight, Hitomi gradually finds her emotions stirred. Yielding to Toa's persistent advances, her suppressed desires begin to awaken, and ultimately she gives in to him physically. Having lost her husband, the forgotten instincts of a woman resurface as she recalls memories of their life together, yet she becomes consumed by these new feelings. However, Junichi, who also becomes aware of Hitomi, grows intrigued by her and starts interfering in their relationship. As the circle of transgression widens and new desires spiral out of control, Hitomi sinks deeper into confusion and guilt.