One day, in the world, there was a war between ten alternative worlds. It was called the Conceptual War, and 60 years ago our world won. All of this was classified, so ordinary people know nothing about it to this day. After the death of the boy’s grandfather, high-school student Sayama Mikoto is unexpectedly summoned to a gigantic corporation, IAI. There he learns that, as a result of the acceleration of Negative Concepts, the world is on the verge of destruction. To prevent this, negotiations must be held with the survivors from other worlds to release ten concepts into the world. And so Sayama is drawn into the final battle in order to deal with the consequences of the Conceptual War, which left behind so much hatred.