As a caregiving volunteer, a young female college student begins looking after an elderly man who lost his wife. She is devoted and kind, treating the old man like a beloved grandfather, but he remains physically vigorous and gradually becomes attracted to the girl's ample breasts. One day, the man pulls his genitals out from his diaper and masturbates using the girl's apron. When she discovers him, she feels her heart race at the sight of his erect penis. Intimate care is part of the job, and through these physical duties, the two begin to share emotions and grow closer. Under the guise of caregiving, a romantic tension slowly blossoms between the young girl and the elderly man.