Shota's father, worried about his son's poor lifestyle habits, decides to hire a strict housekeeper. However, Shota instantly falls for the new housekeeper, Ruri, who has an incredibly voluptuous figure. Using shoulder massages as an excuse, he begins groping her large breasts, sneaks into the bath with her to receive titty fucks, and eventually progresses to full intercourse. An unexpected romantic affair unfolds amidst everyday life.