written and illustrated by kei sasuga, the manga series is being serialized in kodansha's "weekly shōnen magazine" from april 23, 2014. the chapters are being collected and released in the tankōbon format by kodansha from july 17, 2014. as of september 17, 2019, twenty-four volumes have been released. kodansha usa publishes the english-language translation of the manga via digital download.