Sensou Kyoushitsu

That boy could see sound.
Luca, a boy with branches sprouting from his head, serves as a bugler in a mercenary company that thrives on war. Though surrounded by conflict, he dreams of becoming a musician.

One day, amid the chaos of battle, a mysterious power awakens within him. His journey soon brings him into contact with the Pontiff, who stands at the pinnacle of the nation; Zoe, a fellow Branch-Born; and many others whose lives are intertwined with his own.
Through these encounters, Luca's destiny begins to change in ways he could never have imagined.

Arboral Year 1294—a battle that will determine the future is about to begin.

[Source: CyberAgent]