So... is Helck finished or not?
NO, it is not finished.
Why?
We found unfinished non-core content:
Iken Senki Völundio (Alternative Setting)
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
After the Demon King's defeat by a hero, demons are in disarray and must hold a tournament to determine his successor.
Vamirio, one of the Four Heavenly Kings, is tasked with overseeing the competition, but she's suspicious of a human hero named Helck, who inexplicably enters and claims to despise humans.
Despite his incredible strength and popularity making him hard to dismiss, Vamirio is determined to uncover Helck's true motives, especially as humans begin disappearing, leading her to believe something sinister is afoot within the demon realm and Helck is involved.
Vamirio creates a plan to expose Helck, hoping to determine where his loyalties truly lie before the demon world is threatened.