Mecha Master: Sky Era

In 3799, Earth's technology has reached its peak. Human beings have used all available resources to develop new technological "mechas". Humans can use mecha technology to travel into space, and are more than sufficient for ultra-long-distance space exploration, resource transportation and even space wars. In the process of development, humans have established planetary colonies outside the earth. However, when humans crazily expand outwards, they face many problems and crises.