When the giant sword descended on the Blue Star and spiritual energy revived, humans realized that the solar system they lived in was just a man-made home built by powerful beings. Because the environment in the real universe was harsh, it was difficult for humans to reproduce and grow, so many "solar systems" like incubators were built to multiply the number of humans and make up for the consumption of human beings competing for living space with other races in the real universe. When another race war came to an end, mankind suffered heavy losses... Blue Star was opened as one of the many breeding homes, and the spiritual energy was revived and entered the real space of the universe...
