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From Crunchyroll: In the Edo period, there was a shrine maiden called "Itsuki-hime" in the mountain village of Kadono. Jinta, a young man who acts as Itsuki-hime's guardian despite being a stranger, encounters a mysterious demon who speaks of the far future in the forest where he went to defeat it. From Edo to the Heisei era, this is the first volume of a huge Japanese fantasy series about a demon man who travels through time while continuously questioning the meaning of wielding a sword.
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