Siblings Sora and Shiro are a pair of hikikomori NEETs who together form 『 』 (Kūhaku (空白?, lit. "blank space")), an undefeated online gamer and urban legend. They both consider the real world to be a "crappy game". They are summoned by a boy calling himself "God" to a fantasy world where he has forbidden all violence and warfare between the sixteen intelligent races living there; instead, everything is decided by games. The siblings find themselves the would-be saviors of humanity (Imanity), who rank sixteenth among the races and have been confined to their sole remaining city.
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