So... is Ichiban Ushiro no Daimaou finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: June 19, 2010
Manga finished: April 01, 2014
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
Akuto Sai wants to be a force for good and enrolls in a magic academy to achieve his dream.
However, his arrival is met with a shocking prophecy: he is destined to become the Demon King.
Now, Akuto must navigate a world that fears and distrusts him, fighting against his predetermined fate.
Surrounded by a group of interesting girls, each with their own agendas, he struggles to prove he is not the villain everyone believes him to be.
He aims to control his destiny and demonstrate that even with such a dark prophecy, he can still choose his own path.