Chair of the Seishū High School board and Hiroko Ōkubo's grandfather. He is a regular customer at Akaishi's father's sake store. He has a very stubborn personality and always keeps his promises. As board chair, he is a little worn out from worrying about Vice Principal Shidō (the temporary principal), though he does not let that show in public. During the first practice game between the first-string and prefab teams, he sneaks in the game with Aoba. During the rematch, he goes back and forth between the two teams' benches, and after the prefab team wins he enforces the agreement that the losing team be dissolved.
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