"Sister Akari" is a housekeeper in a certain mansion. Since his mother is away on a long-term business trip overseas, Shota is feeling lonely, so he distracts himself by playing with Sister Akari. However, at the instigation of his bad friend, Shota pretends to be lonely while playing with Sister Akari's big ass. He then sets up a night rape for Sister Akari, who is completely at ease with him...