Kojima lamented that first love never works out—but his first love was his best friend's mother, Yuki. She's married, has a child, and the obstacles are clearly insurmountable. Deep down, he'd already given up on a forbidden romance. However, when he ends up staying overnight at his friend's house, his feelings begin to stir again. Seeing Yuki, whose beauty remains unchanged from years ago, reignites his long-buried desire. Kojima starts using her lingerie as a masturbation aid, indulging in innocent fantasies. Then suddenly, Yuki appears before him...!