So... is Bullbuster 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
Bullbuster tells the story of Tetsurou Okino, a brilliant young engineer who joins Hato Industries, a small, struggling company specializing in pest control.
He brings with him his own creation, the Bullbuster, a powerful robot designed for exterminating mysterious creatures that plague the land.
However, Hato Industries faces significant financial challenges, forcing them to be incredibly frugal in their operations.
The anime explores the conflict between the desire to effectively combat these creatures and the harsh realities of operating on a shoestring budget, leaving viewers to wonder how Hato Industries can possibly succeed.