Tormented by his uncontrollable feelings for his stepmother, Sayo, Yuichi suffers in silence. Sensing his inner turmoil, Sayo allows him to secretly watch her masturbate, but nothing more. Yet the young Yuichi can't restrain himself and reaches out to touch her. At that very moment, his father suddenly falls ill and passes away. After the forty-ninth day memorial service, Yuichi remains haunted by guilt over his father's death, yet he cannot sever his connection with Sayo. Just as things seem to reach a breaking point, an unexpected visitor appears before him, setting the stage for a new turn of events.