Riddle Story of Devil (Japanese: 悪魔のリドル, Hepburn: Akuma no Ridoru, lit. Devil's Riddle) is a Japanese manga series written by Yun Kōga and illustrated by Sunao Minakata. It was serialized in Kadokawa Shoten's Newtype magazine between the September 2012 and November 2016 issues and is licensed in English by Seven Seas Entertainment. This series, set in Kagawa Prefecture, tells a story of a young undercover assassin named Tokaku Azuma who chooses to protect her target-turned-friend Haru Ichinose from 11 other assassins who each want to claim the student's life and an extraordinary reward. An anime adaptation directed by Keizō Kusakawa and animated by Diomedéa aired in Japan between April and June 2014. The series is licensed for streaming and home video in North America and Australia by Crunchyroll and Muse Communication in Southeast Asia and South Asia. The original title is a pun on Devil's Trill (悪魔のトリル, Akuma no Toriru) by Giuseppe Tartini. Source: Wikipedia (en)