The grandfather of Aoi and Kouta. He is the master of the Shingetsu style and Kunieda's instructor. He possesses a violent personality and is a very stern man with a hair-trigger temper. He also adopts an attitude of fighting first, asking questions later.
Spoiler
Not only does he know about demons and the demon world, but he also recognizes Oga as a contractor and decides to train him to use demonic powers.
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