So... is Beelzebub-jou no Okinimesu mama. finished or not?
It is a bit ambiguous in this case.
Why?
The anime finished before the manga:
Anime finished: December 27, 2018
Manga finished: May 12, 2020
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
Beelzebub, a legendary fallen angel who now rules Pandemonium, is not quite what people expect. Instead of a terrifying figure, she's actually a woman with a surprising love for all things fluffy.
Myurin, her newly appointed assistant, discovers this hidden side of Beelzebub as he begins working closely with her.
While she's exceptionally capable in her role as ruler, Beelzebub is surprisingly awkward and reliant on Myurin's help outside of work.
Myurin finds himself charmed by her endearing quirks, and his new job exposes him to the unexpected personalities and dynamics within Pandemonium's devilish leadership.
The anime explores the contrast between Beelzebub's fearsome reputation and her true, more innocent nature, while also delving into the relationships and humorous situations that arise in Pandemonium.