No Game, No Life

Sora and Shiro are siblings, near-shut-ins, and the unbeatable mononymous gaming legend Blank between them. Their answer to the offer of a one-way ticket to a fantasy world ruled entirely by games — where war has been replaced by a no-violence covenant and every dispute is settled by wagered competition — is enthusiastic. The world's only humans are a single fading kingdom about to lose its last city. Sora and Shiro take over the throne in the first week and start playing for the rest, including the seat reserved for the god of games himself.