A young bugler with supernatural powers is swept up into an epic struggle for the fate of the world. Cry havoc and sound the song of war!

In Arboral Year 1294, the world is dominated by nine massive towers known as the Spires— remnants of an advanced civilization, they are filled with lost secrets and powerful knowledge that nations struggle to possess. Luca is a bugler in a mercenary company who wants nothing more than to leave the battlefield behind and become a true musician, a maestro. But marked as one of the enigmatic Branch-hexed, and gifted with the strange ability to see the sound of his instrument, Luca finds himself drawn reluctantly into a war of epic proportions!

With the end of the Normandy campaign, the war between the Spire-holding powers has settled into a conflict mainly between the Papal States and the Empire. While the Pontiff is off handling internal affairs, Luca is given command of his own personal guard, the Star Regiment. Luca and his companions are then assigned to look into sightings of strange Branched in nearby towns. The investigation will introduce Luca to the true rulers of the world, and the sinister truth at the heart of the Spires...