Incubus Cutthroat: Devil Destroyers

Zen Beschimer, a boy of 13 years gets his life changed upside down after the colonization of his country and the assault at his orphanage. To retrieve everything, he lost and for the independence of his nation, he has to join an organization called Incubus Cutthroat, which prominently focuses on eliminating the devils and maintaining global peace. Will Zen be able to return to his normal life or is it his fate to continue?