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 started serialization in Kadokawa Shoten's Newtype magazine with the September 2012 issue. 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.