Akuma no Riddle

Alternative Titles
English: Riddle Story of Devil
Japanese: 悪魔のリドル

Information
Type: TV
Episodes: 12
Status: Finished Airing
Aired: Apr 4, 2014 to Jun 20, 2014
Producers: Diomedea, FUNimation EntertainmentL, Mainichi Broadcasting, Pony Canyon
Genres: Action, School, Shoujo Ai
Duration: 23 min. per episode

synopsis
At a private girls' boarding school, Myōjō Academy, thirteen girls are transferred into the academy's "10th Year Class Black" (10年黒組 Jū-nen Kuro-gumi?). Of these thirteen students, twelve are assassins from various backgrounds who are all tasked with assassinating the remaining student, a girl named Haru Ichinose. If they succeed, they will be granted any wish they desire, but if they fail, they are expelled from the class. One of the assassins, Tokaku Azuma, develops feelings for Haru and defects to her side, resolving to protect her from the other assassins.