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There are known opposite worlds and parallel worlds in the world. The definition of the opposite world is a world that is mostly different from the world we live in. So for example, there is no God in our world, but there is God in the opposite world. The definition of a parallel world is a world that is mostly similar to the world we live in but is not synchronized with it. So for example, if someone dies in a car accident in our world, that person in its parallel world can still live for a few more hours. The story takes place in the opposite world to ours - remember, it's an opposite world, and many things here are different from our world.