From No Game No Life. Cosplayers unknown.
The series follows Sora and his younger stepsister Shiro, two hikikomori who make up the identity of Blank, an undefeated group of gamers. One day, they are challenged by the god of games to chess and are victorious. As a result, the god summons them to Disboard, a reality which revolves around games. Intent on maintaining their reputation as the undefeated gamers, Sora and Shiro plan to conquer the sixteen ruling species and to usurp the god of games. (Wikipedia)