So... is Kyomu Senshi Miroku finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: November 05, 1989
Manga finished: January 01, 2000
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
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
Kyomu Senshi Miroku presents a hidden world where ninja assassins, thought to have vanished centuries ago, continue their deadly craft in secret.
These ninja are not just fighting amongst themselves; they are engaged in a clandestine war against a much more significant threat.
Deep beneath Japan lies a crashed alien spaceship, undisturbed for millennia, and its occupants pose a danger to humanity.
The anime explores the conflict between these psychic ninja and the extraterrestrial presence, revealing a hidden struggle for the fate of the world.