Ayame, a single mother who has raised her only son, Aito, with love. However, one day, Aito's homeroom teacher visits and informs her that he has been engaging in voyeuristic acts at school. Ayame is shocked, but she is attracted to the homeroom teacher who is trying to sincerely face her son who has made a mistake, and ends up having a relationship with him. However, Aito sees their affair and ignites his sexual impulse. Ayame, out of guilt, fully uses her own body and teaches Aito how to have sex...