Civilization in Five-Dimensional Space

The world had just gone through World War III. The Shanghai Cooperation Organization, made up of Russia, China, North Korea, and other countries, fought the Western powers led by the United States for thirty years. Contrary to the predictions many had made before the war, that a nuclear conflict would destroy the Earth, no nuclear weapons were used. Perhaps both sides understood the consequences. The territories of several major powers escaped serious damage. The Bund in Shanghai, for instance, was much as it had been before the war. But many hotspots no longer existed. Both sides used precision strikes against military targets, and the active-duty forces on both sides were all but wiped out. With no other choice, the powerful in each country made major reforms, devolving power and distributing wealth to the common people on a large scale. Though the death toll was not as high as expected, the war's frenzied destruction had all but wiped out any technology facilities, factories, and military bases of even modest value. In other words, aside from nuclear weapons and their people, both sides had seen human civilization reduced to its primitive state. Large numbers of technical personnel were drafted into the military, and almost all of them died. The only people left in the world were those in so-called governments, hiding hundreds of meters underground and afraid to show their faces, and the civilians on the surface who had no way to get involved in the war.

I was one of the survivors. When the draft notice arrived, he disappeared the very next day from this five-dimensional, higher-dimensional world. After the war, he returned in a strange way. What follows is an account he wrote upon his return. You can take it as truth or as a fantasy born of delusion, for your entertainment.

Theme: Through the protagonist's research, humanity enters an era of groundbreaking higher-dimensional civilization.