So... is Dance with Devils finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: December 23, 2015
Manga finished: May 18, 2016
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
Ritsuka Tachibana's ordinary life is shattered when she's unexpectedly targeted by her school's mysterious student council.
These handsome but enigmatic figures, led by Rem Kaginuki, seem to have hidden agendas related to her.
Her world further unravels when her mother is kidnapped, plunging Ritsuka into a secret war between vampires and devils.
Both factions are after a powerful object called the Grimoire, and Ritsuka finds herself inexplicably linked to it.
The return of her brother, Lindo, offers a glimmer of hope, but he too holds secrets that complicate matters.
As Ritsuka navigates this dangerous new reality, she must decide who to trust and confront her growing feelings for the captivating members of the student council.