No Game, No Life Vol. 1 - No Game, No Life (Manga)

A title that 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".