So... is Grancrest Senki finished or not?
It is a bit ambiguous in this case.
Why?
The anime finished before the manga:
Anime finished: June 23, 2018
Manga finished: June 28, 2019
MangaUpdates contains information about the anime adaptation and indicates that it is complete.
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
The continent of Atlatan is plunged into war after a peace treaty is shattered by a chaotic event involving a Demon Lord.
Siluca, a mage from one faction, encounters Theo, a wandering warrior with a special power to fight Chaos.
Driven by his desire to free his hometown, Theo seeks to become a Lord, while Siluca is impressed by his goals.
They form a contract and begin a journey together to restore balance to the war-torn land, fighting against the spread of Chaos and those who exploit it.