Riddle Story of Devil 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.

Lauren Anne Landa is an American voice actress who has worked on English dubs for Japanese anime and video games.