No Game No Life is a light novel series by Yū Kamiya. Sora and Shiro are two hikikomori step-siblings who are known in the online gaming world as Blank, an undefeated group of gamers. One day, they are challenged to a game of chess by Tet, a god from another reality. The two are victorious and are offered to live in a world that centers around games. They accept, believing it to be a joke, and are summoned to a reality known as Disboard.