In the year 2200, an inexplicable barrier appeared in Earth's skies. Though it did not affect the natural world, it made it impossible for any aircraft to leave the planet. In 2250, a lack of resources plunged Earth into a world war and brought it to the brink of destruction. A mysterious person from another world set out to merge the worlds, with the goal of putting an end to the war. And so the story begins.
P.S. The desktop version of Shuke is really awful. You can't see the volumes unless you click to start reading, and there's no way to go straight to the next chapter. It's incredibly frustrating. Please bear with me.