So... is Kusatta Kyoushi no Houteishiki finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: November 24, 1995
Manga finished: June 01, 2002
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
Atsushi, driven by a childhood crush, enrolls at a new high school hoping to reconnect with Masami, whom he affectionately calls Ma-chan.
However, upon arrival, Atsushi discovers that Ma-chan is no longer at the school, and a figure resembling Ma-chan, but with a drastically different personality, has taken their place.
To complicate matters, Atsushi's friend, Kouji, relentlessly pursues him, adding to his chaotic school life.
Atsushi finds himself drawn to this "new" Ma-chan, questioning his feelings and his initial perception of the person he thought he knew.
Ultimately, Atsushi faces a major revelation about the true identity of this enigmatic figure, which throws his feelings and assumptions into complete disarray.