Satoshi goes to deliver soap to his mother, Mariko, while she's bathing, and becomes captivated by her figure. It had been since childhood that he'd last seen his mother's body up close, and what he sees now far surpasses his imagination—her full, voluptuous breasts draw his gaze irresistibly. The arousal causes a visible reaction in his groin, and he is ultimately chased out of the changing room. Unable to forget the image of his mother, he indulges in fantasies of being pleasured by her seductive form, masturbating to the thought. That night, Satoshi's heart, once fixated on his mother's ample breasts, can never return to how it was before.