In 2150, due to over-exploitation and resource plundering, the earth suffered from ecological imbalance, frequent natural disasters, global economic collapse, and social order disintegration. At the same time, alien civilizations have quietly arrived. They are not messengers of goodwill, but plunderers who covet the earth's resources. Under the double blow, human civilization is in danger, and the world has fallen into the darkness and chaos of the end of the world.
