Sora and Shiro challenge Jibril by betting their tablet computer full of books; considering it of high value, Jibril offers her freedom in exchange. They begin a game of materialization shiritori, where the words they use will materialize or disappear from the environment. From the game, Sora and Shiro deduce Disboard's scientific research is lacking, and uses this knowledge to their advantage; they succeed after removing coulomb's law and inducing a hypernova, removing Jibril from the game. Impressed by the two, Jibril solemnly pledges her loyalty to them.