Ran Motoya is a 52-year-old housewife. Her husband has been away on business lately, leaving her alone night after night, forcing her to endure her loneliness while getting through each day. One night, out of sheer desperation, she begins masturbating to ease her longing—only to be caught in the act by her son. Even more shockingly, she discovers him touching his own penis while watching her. Overwhelmed by the sight, she finds herself unable to resist, her eyes drawn to her son's fully grown manhood. A forbidden secret now binds mother and son, as the fear of her husband finding out threatens to destroy everything, while the intense, taboo temptation between them grows stronger.