So... is Moeru! Oniisan finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: September 19, 1988
Manga finished: July 30, 1991
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
Moeru! Oniisan follows the story of Kenichi, a boy raised in the wilderness after being lost as a child.
Now a teenager, he discovers his true origins and decides to reintegrate into civilized society and meet his biological family.
However, Kenichi's upbringing has made him quite different, leading to a series of comedic and challenging situations as he navigates the complexities of modern life and tries to adjust to living with his family and in a town he doesn't understand.
The anime explores themes of adaptation, cultural clashes, and the definition of family, all while showcasing Kenichi's unique and often outlandish approach to everyday problems.