No Game, No Life Vol. 1

The story of No Game, No Life centers around Sora and Shiro, a brother and sister who are brilliant (but unemployed) gamers whose Internet fame have 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 on this alternate world?