Sora and Shiro have since expanded their fame throughout the Elkia Federation and beyond. However, one day, Tet throws a different challenge at the widely-renowned "Blank" duo when he decides to summon two other humans into the Disboard realm. A factual, straight-A student named Shimizu Katsumi and an otaku shut-in named Kadan Aito. When they're called upon by Sora and Shiro, the royal siblings challenge them to a game where if Katsumi and Aito lose, they become Sora and Shiro's servants for a lifetime. Can the unusual team of Katsumi and Aito really beat the infamous "Blank" duo, Sora and Shiro?
4 parts