Naozumi Kyōhachi is a prominent antagonist in the anime Blue Miburo, leading a group known as the Blood's Aspiration Group. He is an adult male with a sturdy build, black hair worn long and wavy to shoulder length, black eyes, and a facial scar. He is often seen wearing a haori and geta, and he carries a black six-foot blade named Tsugumori. His background is rooted in the Kyōhachi Dōjō, where he was the eldest son of the master. After killing an intruder who attacked from behind, he was disowned, an event that deepened his resentment toward the peaceful Tokugawa order. His personality is ruthless and uncompromising; he is driven by a conviction that a samurai's true purpose is found only in combat and that the Tokugawa peace has robbed warriors of their identity. He believes that martial virtue is defined by bloodshed and war. His primary motivation is to dismantle the Tokugawa shogunate and restore an era of constant warfare, allowing samurai to reclaim their place in society. To this end, he targets the young Shogun Tokugawa Iemochi for assassination. In the story, Kyōhachi first appears when he and his group ambush the shogun, leading to a confrontation with the Miburo. He orchestrates a plan to burn down the seven bridges over the Kamo River and set Kyoto ablaze, forcing the shogun to be trapped. His role as the field commander of the Blood's Aspiration Group brings him into direct conflict with key members of the Miburo, particularly Toshizo Hijikata and Serizawa Kamo. His key relationships include his younger brother Yotaro Kyōhachi, whom he compels to serve as the group's figurehead; his sister-in-law Nagi; and the various members of his group such as Ayame. He views Hijikata as a worthy adversary and engages him in a fierce duel, questioning the nature of martial prowess. His development is defined by his refusal to adapt to changing times; he murdered his own father when the old man urged him to move forward, and he ultimately destroys his family's dōjō. In terms of abilities, Kyōhachi is a highly skilled swordsman, able to wield his massive blade with both power and precision. He is physically strong and fast, capable of fighting evenly with seasoned warriors like Hijikata. His fighting style is aggressive and direct, relying on overwhelming force. He meets his end at the hands of Serizawa Kamo, who cuts him down after a brief but intense battle. As he lies dying, he is attended by Hijikata, and his final moments reflect his unwavering belief in the warrior's way. His entire arc serves as a tragic example of a man who could not find a place in peace and chose to burn everything rather than change.