In the Sengoku period, a rounin called Nanashi (meaning nameless) saves a young boy Kotarou and his dog Tobimaru at an abandoned temple. Kotarou has no family, is pursued by a mysterious militia organization from China and hires Nanashi as his bodyguard. Among the pursuers is a man called Rarou, a very skilled warrior with blond hair and blue eyes. He obeys an old man called Byakuran and is a member of the Chinese militia. Unlike his companions in the militia, he is not serving any Emperor and just wants to fight with the strong.
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