The story is set in the Edo period of feudal Japan. It revolves around Yamada Asaemon, nicknamed Kubikiri Asa (literally 'Neck-chopper Asa', often transliterated as 'Decapitator Asaemon'), a ronin who is responsible for testing new swords for the shogun. The character is based on a real-life line of sword-testers who served the Tokugawa Shogunate up to the early 19th century. -- Wikipedia
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