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! The Mikado and her servants convene to discuss their response to the Pontiff's invasion as he continues his campaign against the Erin Empire. Despite their best efforts, and the predictions of their Spire, they can't seem to stop the invasion by the Papal States' forces, nor can they counter Luca's deadly power. Using the Garland's power within the Empire itself seems to be the only choice left. Meanwhile, Luca and his Branched squad take another step toward the Imperial capital, Lond.