So... is Sakugan finished or not?
It is a bit ambiguous in this case.
Why?
The anime finished before the manga:
Anime finished: December 23, 2021
Manga finished: August 12, 2022
We could not confirm the source content in MangaUpdates.
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 far future, humanity resides in underground colonies within a vast, dangerous area known as the Labyrinth. They face constant threats from giant creatures called kaijuu, and their lives depend on specialized workers and explorers called Markers.
Memenpu, a brilliant young girl, yearns to leave her colony and explore the Labyrinth, driven by dreams of a world above ground. Her father, Gagumber, strongly opposes this, fearing the dangers.
However, an event involving the kaijuu forces them to embark on an unexpected adventure together, setting them on a path to uncover the secrets of the Labyrinth and potentially change the fate of humanity.