Iku is the owner of a women-only rental apartment building, using part of it as her home and office. After losing her husband, she lives alone with her reclusive son, who has a habit of peeping. Iku has an abnormally strong sex drive and becomes aroused while helping her son masturbate. As a result, she develops an intense dependency on her son's body, and the story is filled with inner conflict and uncontrollable desire.