Mitamura is a well-known martial arts master until he suffered a terrible illness. His students Kai, En, Ryo, and the others didn't want to see their master die until Dr. Ichigaki appears and he tells them that he can help their master by using their bodies for en experiment. It is revealed that Dr. Ichigaki made Mitamura sick and he took him hostage until he was rescued and healed by Kurama.