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! As the siege of Mont Tombe came to a climax, Luca's Branch hex flowered in a shocking display of power. Fighting to save Luca, Zoe also unleashed her full strength against Akira. In the aftermath of their duel, something strange about Akira is revealed. Later, back in Thermi, the capital of the Holy Realm, the Branched squad gets a brief rest. A meeting with the Pontiff causes Luca to question his motives for becoming a maestro and opens his eyes to the true origin and purpose of the Spires.

Are Luca and Zoe doomed to a life of endless war, or can they take their fate in their own hands?.