Sora and Shiro are two siblings and are known in online games as the undefeated group named The Blank. In real life, they are hikikomori who are ostracized by the world. One day, they receive a challenge from Tet to a game of chess and are victorious. In response he offers to send them to a world which revolves around games and they accept, believing it to be a joke. They are then summoned to a reality known as Disboard where a spell, known as the Ten Pledges, prevents violence and enforces the rules and outcomes of games. They travel to Elkia, the nation inhabited by humans, where Sora plays poker against a woman for her money and wins by out-cheating her. He and Shiro rest at an inn and decide their next goal is to find a home.