The stories take place during Edo period under the Tokugawa shogunate and the rule of Tokugawa Ienari and center around the title character, a sleepy-eyed, outlaw swordsman who is the son of a Japanese mother and a foreign father, who was conceived during a Black Mass.
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Portions of the series were translated in the short lived English anthology Raijin Comics.
He is best known for the Sleepy Eyes of Death (Nemuri Kyoshiro) series, Ninja (Shinobi no Mono) series and Nakano Spy School (Rikugun Nakano Gakkō) series (based on the Nakano School).