A member of Hinobori Gakuen's 5-3 "Chikyuu Bouei Gumi". His ninth attendance number.

Koji is a main pilot of Jyu-Oh and is in charge of power control and weapon operation of Raijin-Oh, God Raijin-Oh.

He is kind, and a little timid, however, he shows courage. He believes an UFO and occult.