Kantai is secretly the general of the province of Baku. He is a hanjyuu capable of taking the form of a large bear, and he possesses immense strength, even in his human form. He rescues Shoukei after she flees from soldiers attempting to arrest her for throwing a rock at Gahou's executioners. Kantai aims to expose Gahou's corruption and sends Shoukei to the intermediate village of Houkaku to deliver touki weapons to the Shisui rebels. Suzu arrives there to take the weapons to Takuhou. Upon realizing that his allies in Shisui will be annihilated by Gahou, Kantai dispatches his own forces to intervene. Shoukei accompanies him and seeks out Suzu to inform the Shisui rebels that Kantai supports them. When Koushou insists on saving Takuhou from the fire, Kantai is shamed into assisting him despite his reservations. When Youko asks Kantai what reward he desires for fighting corruption, he requests a pardon for his lord, Koukan. After Gahou is defeated, Youko places Kantai in command of Kei's entire army.
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