Koichi is a young, wheelchair-bound boy who attends Mari's kindergarden class.
About[]
Story[]
While Kinnikuman is on vacation with Ms Mari's kindergarten class at Easter Island, the young Kōichi laments being with an idiot like Kinnikuman, preferring to instead be with his favourite Justice Chojin Buffaloman.
Soon after, Satan King takes Mari's kindergarten students hostage and summons the Justice Chojin to Mount Everest. Kinnikuman ultimately defeats Satan King and the Ancient Chojin, saving the children. In the excitement of their victory, Koichi even manages to walk again, and finds a new-found respect for Kinnikuman.