So... is Prism Ark 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
The kingdom of Windland is under threat from the Sablum Empire, who seek to conquer it.
The Empire is using mercenaries and powerful magical beings called Angels to launch a new attack.
Hyaweh, a skilled swordsman, and Priecia, a student with a mysterious past, are training at Windland's Knight's Academy.
They are learning to fight and preparing to defend their home, while making friends and allies who will help them in the coming conflict against the Empire.
The anime follows their journey as they grow stronger and face the challenges ahead.