So... is Akuma no Riddle finished or not?
It is a bit ambiguous in this case.
Why?
The anime finished before the manga:
Anime finished: November 22, 2014
Manga finished: October 08, 2016
MangaUpdates contains information about the anime adaptation and indicates that it is complete.
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.
The mangas and the non-core contents are excluded by default, but you can enable them by clicking the buttons below:
Akuma no Riddle
Riddle Story of Devil
Anime - Base
Release date: April 04, 2014
Akuma no Riddle: Shousha wa Dare? Nukiuchi Test
Riddle Story of Devil: Who's the Winner?
Anime - Sequel
Release date: November 22, 2014
Synopsis
Akuma no Riddle centers on Tokaku Azuma, a newly transferred student to Myoujou Academy.
This academy is unique because it is a boarding school comprised entirely of female students.
However, Class Black, to which Tokaku is assigned, holds a dark secret: all twelve students are assassins.
Their target is Haru Ichinose, an innocent and unsuspecting classmate.
The assassin who succeeds in killing Haru will be granted any wish.
But Tokaku finds herself drawn to Haru and makes a promise to protect her.
Now, Tokaku must find a way to protect Haru from her classmates who want to take her life.