![](https://cdn.animecharacters.io/images/anime/large/8050-eb67ea27.jpg)
Format
TV
Episodes
12
Episode Duration
23 min per ep
Status
Finished Airing
Premiered
Spring 2014
Aired
2014-04-04 to 2014-06-20
Source
Manga
Rating
R - 17+ (violence & profanity)
Genres
Action
School
Girls Love
Studios
Diomedéa
Producers
Mainichi Broadcasting System
Pony Canyon
DAX Production
Licensors
Funimation
Akuma no Riddle (悪魔のリドル)
Tokaku Azuma has just transferred to the elite Myoujou Academy, a private girls' boarding school. But there's a catch: she, along with 11 of her fellow students in Class Black, is an assassin taking part in the challenge to kill their sweet-natured classmate, Haru Ichinose. Whoever succeeds will be granted their deepest desire, no matter the difficulty or cost. However, each assassin only gets one chance; if they fail to kill her, they will be expelled. Despite the extraordinary reward, Tokaku decides to take a different course of action. Though Haru is her target, the young assassin soon finds herself drawn to the very girl she is supposed to kill. With the entire class out for Haru, Tokaku refuses to let her friend die, vowing to protect her from a growing bloodlust. [Written by MAL Rewrite]