Eleven year old Koji is a member of elementary school division in sixth grade in Class A. A member of the prestigious Takamura clan of ninjas, Koji is talented in the arts associated with his family. Unfortunately, he doesn't have a height that matches the level of his skills. Koji is also the cousin of Takamura Suoh of Clamp School Detectives. He is based on the player character that was used by Mokona.