So... is Aa Harimanada finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: October 01, 1992
Manga finished: January 01, 1996
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Aa Harimanada tells the story of a newcomer to the world of Sumo wrestling, Harimanada, who immediately makes waves due to his outlandish appearance and audacious claims.
He boldly vows to surpass a legendary record, setting an incredibly high bar for himself and risking his entire career.
His arrogance offends the established Sumo world, and experienced, high-ranking wrestlers are eager to teach him a lesson.
The anime follows Harimanada's challenging journey as he faces fierce competition and attempts to rise to the top of the Sumo hierarchy while living up to his own boast.