月刊少年マガジン
The manga is written and illustrated by Marimo Ragawa. The series began in the 2010 1st issue of Kodansha's "Monthly Shōnen Magazine", published on December 5, 2009. Kodansha has compiled its chapters into individual "tankōbon" volumes. The first volume was published on October 15, 2010. As of March 17, 2021, twenty-seven volumes have been released. An omnibus edition with the first three volumes released in Japan on March 17, 2021.