The earth can no longer support the current population. In addition, the earth is running out of water and extreme weather is occurs, causing people to suffer from drought. The highlight, the ozone layer is thinning, allowing sunlight or other particles from space to penetrate more easily.

The earth was uninhabitable, some scientist sent humans out to find another place to live. The astronauts were sent and managed to settle a new place.

Unfortunately, there were aliens who also came to claim the territory. There was a big battle in the new territory. The Astronauts must fight with aliens who have great weapons and are beyond reason, and adapt to new territories that have unique but dangerous terrain.