The reason why Ken, who once treated her kindly, began avoiding his mother, Asami (Aya Masuo), was due to a certain incident. Asami suddenly barged into Ken's room without knocking while he was masturbating. Shocked by this event, Ken could no longer open his heart to her. Later, Asami continued acting aggressively, even in front of Ken's friend, Hideo. Initially trying to comfort Ken, Hideo eventually lost control, overwhelmed by Asami's voluptuous body, and forcibly pinned her down. However, this incident was only the beginning of Asami's tragedy, as even deeper troubles lay hidden beneath.