| Chishio |
|Voice Actor|| 陶山 章央 |
Chishio is a Level 25 duelist and is the Number 1 "Creature Battle Duelist" in the whole school. On the day that Teru and Cocoro newly joined the school, his situation changed. He managed to easily defeat Teru but then he realised that Teru is just a level 8 "Creature Battle Duelist" who easily got defeated.
He faced off against the real Number 1 duelist Cocoro, who told him that she is Teru's twin sister. He was then defeated in a Creature Battle Duel by her.