Neotokio is struck by a territorial conflict between the city’s two most dangerous Yakuza clans: the traditional Minashigo clan and the progressive Kuroi Taiyô clan. The members of the Minashigo clan reject the idea of artificially modifying their body in order to preserve their humanity. Meanwhile, the members of Kuroi Taiyô use the latest technology to modify their weapons and anatomic structure, since for them, the human flesh is weak and only the result matters. Kaito, a samurai of the Minashigo Clan, has to save his leader’s daughter who has been kidnapped by the Kuroi Taiyô Clan during an ambush. Since the life of Aiko and the Clan’s honor is in danger, Kaito has to begin a dangerous search in order to them