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Ittosai Kunieda (邦枝 一刀斎)Aoi and Kouta's grandfather. He is the master of the shingetsu style and Kunieda's instructor. He has 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.[/spoiler]