So... is Ninpuu Kamui Gaiden finished or not?
It is a bit ambiguous in this case.
Why?
The anime finished before the manga:
Anime finished: September 28, 1969
Manga finished: March 10, 1987
We could not confirm the source content in MangaUpdates.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Synopsis
Ninpuu Kamui Gaiden follows the perilous journey of Kamui, a ninja who has abandoned his clan.
His act of defiance brands him a traitor, forcing him to constantly evade relentless pursuit from his former comrades.
Wandering through Edo-era Japan, Kamui relies on his sharp wit and exceptional skills to survive the constant threat of assassination.
As the series progresses, the weight of his isolation and persecution begins to take its toll, leading to a descent into paranoia and a profound distrust of everyone he encounters.