Takuma Ota is a perverted otaku and self-proclaimed “anal maniac” who secretly films girls in the school toilets, carefully ranking each one’s anus by appearance, tightness, and appeal. His hidden hobby operates smoothly until one day his entire secret world collapses when he is caught in the act. The person who discovers him is none other than the school’s idol and rich ojou-sama, Shizue Yukihira—a seemingly pure, cute, and innocent high-class girl. Instead of exposing or reporting him, Shizue makes an unimaginable request: “W-Would you please train my anus?!” What begins as blackmail or shock turns into an intense, mutual anal training partnership. Takuma starts “ranking” and developing Shizue’s once-tiny, pristine anus through various tools, liquids, enemas, and insertions in risky school locations (like the gym storage room), gradually transforming the elegant young lady into a drooling, climaxing anal freak who craves more. The episode emphasizes the “miraculous matching” of two hidden perverts and the rapid corruption of the ojou-sama through heavy anal play.