So... is Natsuki Crisis finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: April 21, 1994
Manga finished: January 01, 1997
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
Natsuki Kisumi is a talented high school wrestler, known for her unique fighting style.
Her life takes an interesting turn when Rina Takaoka, a transfer student with a combat sports background, joins her school.
Natsuki hopes for a friendly rivalry and challenging spars with Rina.
However, Rina carries a difficult past, attracting unwanted attention and potential conflicts.
To overcome these challenges, Natsuki realizes she needs to refine her skills and develop a powerful finishing move.