Kageyama Reiji is the coach for Teikoku Gakuen and Zeus. When he was young, he was a member of the Inazuma Eleven. In season 2, he is the coach for Shin Teikoku Gakuen. Later in season 3, he uses an alias Mister K (ミスターK) and becomes the coach of Team K and Orpheus. In Inazuma Eleven GO Galaxy, now known as Kuroiwa Ryuusei (黒岩くろいわ 流星りゅうせい), he is the coach for Inazuma Japan, Earth Eleven and Faram Dite. In the alternate timeline of Inazuma Eleven Ares no Tenbin, Kageyama once again takes up the role of Teikoku Gakuen's coach. He later becomes the coach for Shadow of Orion in Inazuma Eleven Orion no Kokuin.