Endou serves as a faculty member at the private school central to the story. He becomes directly involved in the sexual situations developing between staff and students, notably through his interactions with the school nurse. His primary narrative role is participation in and facilitation of the series' erotic encounters within the educational environment. A significant narrative development occurs when Endou forms a romantic connection with Takeuchi, a new intern at the school. This relationship culminates in their pairing at the series' conclusion, providing a narrative resolution for both characters within the established comedic and erotic framework.