Oji Hoshino
Oji's a third-year high school student who joined the program as an observer. He first showed up in episode 2 of the anime. What fans tend to notice most about him is his intense, almost yandere-like attachment to Yuuri Amagake—one of the main characters. He's the type to form pretty strong connections with people, which defines a lot of his character dynamics throughout the series.
Content compiled by AnimeList.moe from publicly available sources.