So... is Ninjaman Ippei finished or not?
NO, it is not finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
In the remote village of Tokio, fourth-graders possess bizarre superpowers and aspire to become ninjas.
Ippei and his classmates dedicate themselves to ninja training, but face constant challenges from the sneaky and technologically advanced kids of Techno village.
The anime blends ninja themes with school comedy, showcasing the everyday lives and rivalries of these super-powered young ninjas.