In 2024, three giant meteorites in the constellation Orion struck Earth, causing a terrible catastrophe that killed up to 4 billion people and wiped out countless species. This disaster was called "the heavenly fire of the end of the Common Era" by the survivors.

In the 15th year of the new century, the United Nations was established in the new century, and the permanent members were the three superpowers of the Asian Federation, the North American Federation, and the European Union Federation. There are 53 other member states.

In 120 A.D., the Asian Federation successfully launched the first artificial satellite after the end of the world, and in 122 and 123, the artificial satellites of the North American Federation and the European Union were also launched one after another, and the level of human development finally returned to the pre-apocalyptic standard.