Kazumi Mishima is another participant in the Death Game, he is Nao's former teacher and is quite eccentric in both appearance and personality. Being a little odd, Mishima often puffs mad scientist laughs after sentences, and his emotions often conflict with his appearance. Mishima seems to enjoy acting strange to amuse others, behaving cryptic and overly analytical of everyones actions. His unusual social quirks aside, Mishima makes it clear he has no ill intentions and frequently reminds others to be safe and cautious.