Years after losing her husband, Hikari lives alone in a spacious house. Her daughter and son-in-law return home for a visit, bringing back the warmth of family life she had long missed. Amid cheerful conversation and a pleasant tea time, an unexpected moment occurs—Hikari's eyes accidentally fall upon her son-in-law's crotch, stirring emotions deep within her. Though the gathering remains joyful, her mind wanders elsewhere. In her early forties and long deprived of intimacy since her husband's passing, that fleeting glimpse leaves a powerful impact. From then on, Hikari becomes increasingly aware of her son-in-law's body, her fantasies growing more intense each day. Despite feeling guilt and self-loathing for her desires, she finds it impossible to resist the urge to see him up close. One day, while her daughter is out and her son-in-law naps, Hikari finally seizes the opportunity she's been longing for...