So... is Wolf Guy finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: June 21, 1993
Manga finished: January 01, 1971
... 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
Wolf Guy follows Akira Inugami, who finds himself in a dire situation after being poisoned.
To survive, he must take an antidote with a drastic consequence: it transforms him into a werewolf.
Akira now grapples with his newfound lycanthropy and the internal struggles it brings.
His unique condition also draws unwanted attention from the military, who see him as a potential weapon.
He must navigate his transformed existence while trying to avoid being exploited for his powers.