Mother Satoko is her son's former homeroom teacher, and they still cherish their special bond. Their relationship has evolved into an intense physical connection, so deep that they seek each other's bodies even after the son has moved out. The son secretly watches his mother from the shadows, but she's fully aware of his presence. One day, he catches her masturbating. In that moment, he confesses, "I've been doing the same thing for you, Mom," and begins jerking off right there in front of her. Their forbidden bond, fueled by love, desire, and complicated emotions, spirals into uncontrollable passion.