So... is Ga-Rei: Zero 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)
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
In a world secretly plagued by supernatural threats, a specialized government agency known as the SDCD protects the populace.
The story focuses on Kagura Tsuchimiya, an orphan who finds a new family and a strong bond with Yomi Isayama.
Together, Kagura and Yomi become skilled exorcists within the SDCD, battling these hidden monsters.
However, their close relationship and their shared responsibility are tested by the growing pressures of their duty and the complexities of family politics.
As their paths diverge, one embraces her role as an exorcist, while the other is drawn toward a darker, potentially irreversible fate, threatening everything they hold dear.