Sora and Shiro are brother and sister, and they both have reputations as brilliant NEET (Not in Education, Employment, or Training) hikikomori (shut-in) gamers. Their skills have even spawned urban legends all over the Internet. Unfortunately, these two gamers consider the real world to be just another "crappy game," and end up having the shock of a lifetime when they are summoned by a God named "Tet" to an alternate world.