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. 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 by Funimation in North America and Madman Entertainment in Australia. The original title is a pun on Devil's Trill (悪魔のトリル, Akuma no Toriru) by Giuseppe Tartini.