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 choice: To make money, they'll have to take down these monsters called Worlds...or die trying.