In the Edo period, there was a shrine maiden called "Itsukihime" in the mountain village of Kadono. Jinta, a young man who acts as the shrine maiden'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 huge Japanese fantasy series follows a demon man who travels through time while continuously questioning the meaning of wielding a sword. 
 
(Source: Crunchyroll News, edited) 

Notes: 
• The first episode has a runtime of ~1 hour.

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Non-anime roles:
- Munto in "Utawareru Mono" (Video Game)
- Wein in "Project Sylpheed" (Video Game)
- Caius Ballad in "Final Fantasy XIII-2" (Video Game)
- Yuanwu in "Wuthering Waves" (Video Game)

In the Edo era, young Jinta and his sister must flee their home, finding refuge in a mountain village. Years later, Jinta has grown into a skilled swordsman, sworn to protect the priestess of the village shrine. Charged with slaying a demon that threatens the shrine, Jinta confronts the malevolent creature in the forest, only to learn a shocking truth. The demon speaks of events one hundred and seventy years hence, when Jinta must confront the demon in the future. Thus begins an epic fantasy journey that spans multiple eras as Jinta hunts a demon through time and must come to terms with his own dark nature.
 
(Source: Seven Seas Entertainment)

Douka no Oni