A Hitchhiker's Guide to Different World Civilizations

In 2779, after hundreds of years of forbearance and restraint, a certain powerful country with an absolute advantage was finally forced into a desperate situation with the cooperation of other countries. In order to retaliate, a certain powerful country launched an artificial black hole weapon that was under development. However, it accidentally landed on an island in the Pacific, causing a space collapse and accidentally connecting to another parallel universe.