What This World Is Made Of Vol. 1 by Shin Yamamoto

No family, no home, and no savings—the Nakata brothers, Kanade and Kaname, have lost it all. So when a mysterious app offers to help them find lucrative work, what choice do they have but to sign up? Introduced to a gamified system of bounties, the two soon come face-to-face with the “odd” in odd jobs—the dangerous creatures they must now fight. But Kanade and Kaname have no To make money, they’ll have to take down these monsters called Worlds…or die trying