So... is De:vadasy 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
Kei, an ordinary young man dealing with the typical challenges of adolescence, finds his life unexpectedly turned upside down.
Earth is suddenly attacked by a mysterious enemy wielding advanced robotic weaponry.
Against all odds, Kei is selected to become humanity's champion, tasked with protecting the planet from this formidable threat.
The series will likely follow Kei's journey as he learns to navigate his new role and face the overwhelming odds stacked against him, balancing his personal life with the immense responsibility thrust upon his shoulders.