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There is a universe like ours in another time and space. We call it the "polar" universe. There are only two continents on a planet in the polar universe, the Far North Continent and the Far West Continent. It is inhabited by two different races, one warlike and one peaceful. The protagonist "Ye" of the novel suddenly breaks into this far north continent and meets "Maple". A series of stories will happen between them, revolving around these two continents.

This world is far vaster than we know, and this universe is far more complex than we know. Parallel universe, time travel, magic technology. In our universe, there are things that want to come in and things that want to go out. Warriors from all over the world gather together to resist the "extraterrestrial things"