Jinnosuke Mudou

He is a guest instructor in the test prep class that [Itsuki Nakano](https://anilist.co/character/126375) have attended.
~!He was the former teacher and ex-husband of [Rena Nakano](https://anilist.co/character/157195), thus being the biological father of the Nakano quintuplets. He holds some animosity towards [Maruo Nakano](https://anilist.co/character/135383) because of allowing his daughters to follow the same misguided path as did his late wife.!~