In a world consumed by war, humanity has fought for survival against the relentless onslaught of the Airos, monstrous beasts that threaten to wipe them out. For 130 years, the conflict has raged with no end in sight, a brutal struggle of attrition that has left the world in ruins. The Airos, with their overwhelming numbers, have pushed humanity to its limits, forcing even the youngest adults into battle. At the age of 19, those not deemed essential to society are drafted into the military, and given only two weeks of basic training at the academy before being thrown into the fray.
Layzal Regula one of those conscripts enters a new world, filled with nothing but bleak despair. Entering the War of The Forgotten, the very echoes of battle now attempt to drown him.