What This World Is Made Of Vol 1

What This World Is Made Of by Shin Yamamoto. A Comedy manga rated Teen, published in English by Yen Press.

Brothers Kanade and Kaname Nakata have nothing left: no relatives, no home, and no money. So when a mysterious app offers them well-paid work, they have little choice but to accept. The app runs like a game, handing out bounties, and the brothers soon learn the jobs mean hunting dangerous monsters called Worlds, a gig they may not survive.