NO GAME NO LIFE GN VOL 02

Sora and Shiro, brother and sister, are brilliant (but unemployed) gamers whose fame has spawned urban legends all over the Internet. One day, they are summoned by a boy named 'God' to an alternate world. There, God has prohibited war and declared this to be a world where 'everything is decided by games,' even national borders. Humanity has been driven back into one remaining city by the other races. Will Sora and Shiro, the good-for-nothing brother and sister, become the 'Saviors of Humanity' in this alternate world?