So... is Onimusha finished or not?
YES, it is finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is complete.
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
Onimusha follows the journey of Miyamoto Musashi, a character inspired by the legendary actor Toshiro Mifune.
He finds himself in a poverty-stricken land where evil forces are at play.
Musashi must use his swordsmanship to fight against this evil and bring justice to the oppressed.
The anime promises intense and realistic action as Musashi cuts down his enemies throughout his travels.