Broke brothers Kanade and Kaname Nakata might have found their way out of poverty: a mysterious app called Six that offers bounties to whoever can slay monsters known as Worlds. But juggling school, rent, and building-sized spiders isn t as rewarding as all those zeroes might make it look! As they meet more of the app s users, they come ever closer to understanding the secrets of Six But will they fall into inescapable debt from fumbling their missions first?