So... is Ninkuu finished or not?
It is a bit ambiguous in this case.
Why?
The anime finished before the manga:
Anime finished: February 24, 1996
Manga finished: September 17, 2011
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
Ninkuu is a story set in a post-war world where the victorious Imperial Army has rewritten history to portray the elite Ninku warriors as villains.
Fusuke, a deceptively young and powerful former captain of the Ninku, embarks on a personal quest to find his mother who was taken during the war.
His journey leads him to reunite with other surviving Ninku captains, Aicho and Touji, as they face constant threats from the Imperial Army, who seeks to eliminate the last remnants of the Ninku.
Furthermore, various factions covet the Ninku's unique and powerful techniques, making Fusuke and his comrades targets as they strive to protect their legacy and fight against those who caused their downfall.