In 2589, the earth's resources were exhausted, but human civilization and science developed rapidly, but humans had to go to another world, but other civilizations already existed. They made an earth around Sagittarius using nano-superalloys similar to glass, but the resources could only last for 100 years. The United Nations decided to send a team to explore the new continent. New civilizations help each other and rely on each other! Form an interstellar federation!