The original work comes from Kotono Kato and began in Monthly Shonen Sirius back in 2007 with the eighteenth volume due out in January 2017.
We learned previously that studio MAPPA is involved in the adaptation of Shokoku no Altair, a historical fantasy manga series that comes from Kotono Kato.
As he finds himself deeper and deeper in the politics of the ancient world, new enemies and allies surface.