The forbidden desire that I've always held for my mother, Shizuka. If I'm going to tell her, now is my last chance. But if I tell her, our parent-child relationship might be broken... Daike, who is becoming independent and preparing to move, was unable to organize his feelings and was troubled. But on the night before the move, Daike witnesses Shizuka indulging in masturbation with a lonely look. And he was convinced. My mother feels the same way. It's lonely for her that I'm leaving. Daike made up his mind to cross the forbidden line.