So... is Sexy Commando Gaiden: Sugoi yo!! Masaru-san finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: April 01, 1998
Manga finished: September 02, 1997
... But 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
Sexy Commando Gaiden: Sugoi yo!! Masaru-san follows Okometsubu Fujiyama, a transfer student aiming to make friends at his new school, Wakame High.
His plans are disrupted when he encounters the eccentric Masaru Hananakajima, a practitioner of the bizarre martial art known as "Sexy Commando."
Masaru starts a club dedicated to this unique fighting style, roping Fujiyama, now nicknamed Fuumin, into the fold.
The club attracts a collection of equally strange individuals, and their activities become increasingly outlandish, involving everything from extraterrestrial encounters to unexpected facial hair and adorable creatures.
The story centers around the club's growth in popularity and the absurd adventures they experience together.