The plot features many characters, both historical and fictional. Most of the narrative revolves around the cryptohistorical actions of Yasunori Katō, a mysterious former lieutenant of the Imperial Japanese Army who is himself a vengeful oni; a descendant of the people who rebelled against the Japanese Empire in ancient times.[3] With an incredible knowledge of the supernatural and allies in China, Korea and Taiwan; Katō dedicates his life to crippling Tokyo, the seat of power of the modern Japanese Empire.
