Yukie Aono was on the phone with her husband, who lives apart for work. Her son Kenta constantly stared at his mother's ample breasts, imagining their softness, tormented by his inability to touch them. One day, Kenta accidentally witnessed his mother masturbating. Unable to contain himself any longer, he headed straight toward her while she was bathing. This incident deepens the intense, forbidden bond between mother and son, fueling his desperate desire for physical closeness.