So... is Kekkou Kamen finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: March 01, 1992
Manga finished: May 31, 2004
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
Miami Takashi is struggling to survive at a ridiculously corrupt and dangerous academy.
The school is rife with abuse and exploitation, designed to break down its students.
Enter Kekko Kamen, a scantily clad superheroine, who fights to protect the innocent, especially Miami.
She uses her impressive physique and nunchaku skills to combat the school's evil forces.
The story follows Kekko Kamen's battles against the corrupt faculty and her efforts to bring justice to the academy, while the mystery of her true identity remains unsolved.