So... is Akuma-kun (Movie) 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 world is on the cusp of a demonic invasion, foreseen by the dying Dr. Faust.
Too weak to fight himself, Faust seeks a successor and finds Shingo Yamada, a young boy marked as the chosen one.
Faust summons Mephisto, a reluctant devil, from the depths of hell to aid Shingo.
Bound by a blood pact, Shingo and Mephisto must now confront and defeat the rising demonic forces to save humanity, despite Mephisto's lack of enthusiasm.