So... is Hero Bank finished or not?
NO, it is not finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
In a futuristic city obsessed with competitive battles, children and adults use special devices to rent powerful hero suits and fight for fame and fortune.
The story centers on Kaito, an energetic young boy known for his helpful nature, who finds himself entangled in a massive debt after impulsively acquiring a unique and powerful hero suit.
To repay his staggering 10 billion yen debt, Kaito must participate in Hero Battles, using his skills and the borrowed suit to win matches and earn enough money to clear his name and learn the secrets of his suit, Enter the Gold.