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. In order to retrieve everything, he lost and for the independence of his nation he has to join an organization called Incubus Cutthroat, that 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 continue on?