Her great-grandfather was the founder of a major, long-established department store. Her home is a huge mansion in Ashiya, an upscale residential area in the Kansai region. Miss Eri is an extremely wealthy young lady, worthy of being called the daughter of both families. Perhaps due to her elegant upbringing, she is a university student with a gentle way of speaking and a soft demeanor. Her ponytail makes her even more refined. This film follows this young lady as she climbs the ladder to adulthood, as if to teach her about society, until her innocent and cute appearance transforms into a seductive figure.