Kana married a man who had a child from a previous relationship. She had been living peacefully with her stepson, Yuichi, and their relationship was good. However, her efforts to conceive with her husband were not going well, and she secretly felt something was lacking. Eventually, her husband had to go on a long business trip, and she started living alone with Yuichi. Around that time, she began to feel a strange discomfort as Yuichi gradually started to close the distance between them. Unable to stop it, the overt physical contact began to increase...