Ketsueki Ronin, once known as Akairo Kenshin, was the heir of a daimyo cursed for refusing to forge a demonic pact. Transformed into a half-demon with red hair and glowing eyes, he killed his father and became a ronin, wandering the land in search of relief from the curse and quenching his hunger with the blood of evildoers. Rejected by society and plagued by guilt, he wages a constant struggle with his dark side, struggling to preserve the remnants of his humanity as a cursed warrior, doomed to wander forever between the human and demon worlds.