The manga has been serialized in Ichijinsha’s Monthly Comic Zero Sum since its December 2002 issue and released 28 tankobon volumes.
Ichijinsha today posted a 70-second PV for the upcoming OAD to be bundled with the 29th volume of Chika Ogaki’s fantasy manga series Landreaall that is scheduled to be released on February 25, 2017.
So far four drama CD have been released, and its voice cast are set to reprise their roles in the OAD as well.