Sixteen sentient races exist in Disboard, a world governed by Tet, the One True God. The lowest among them, Imanity, are humans who possess no magical abilities. In this realm where all conflicts are settled through simple games, humanity appears trapped with no escape—until the arrival of two outsiders changes everything.
On Earth, stepsiblings Sora and Shiro are inseparable recluses who dominate online games under the username "Blank." Famous on the internet, they view life itself as just another boring game. But after answering a message from an unknown user, they are suddenly transported to Disboard. The mysterious sender is Tet, who explains the world's absolute rules. After he departs, Sora and Shiro seek more information and a place to stay, leading them to Elkia—Imanity's last remaining kingdom.
There, they meet Stephanie Dola, an emotional young woman vying for control of the kingdom. Desperate to reclaim her father's throne, her recklessness makes her goal seem impossible. Inspired by her motivation and passion, Sora and Shiro decide to help Stephanie restore Elkia, ultimately aiming to become the new rulers of this enigmatic world.