Immigrate to Mars and Plunder the Earth

The earth has become increasingly unable to withstand human development, and resources have become increasingly scarce. As a last resort, humans have no choice but to transform and move to Mars. Unexpectedly, the earth was invaded by "aliens" and humans migrated en masse. Today, three hundred years later. A school with the profession of "Reaver" was set up as a clarion call for humanity to fight back, but as things developed, it all seemed not so... Right. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.