In Demon Slayer: Kimetsu no Yaiba Mugen Train Arc, Tanjiro Kamado and his fellow Demon Slayer members embark on a mission aboard the Infinity Train. Their new mission is to investigate a series of mysterious disappearances, carried out by a demon that has been terrorizing passengers and killing the demon slayers who oppose it.
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<i>Note: The first episode is entirely anime original. Episodes 2-7 are a re-edited version of the movie featuring new scenes and music.</i>