In the early 1900s, an intrusion of unknown magnetic fields from outside the Earth was detected. In order to reduce deaths, mankind made arrangements in advance. Unexpectedly, it brought unknown and multiple destructive viruses, severe changes in biology, triggering many large-scale natural disasters, and severe damage to the ecosystem. Less than one-tenth of the Earth's population survives, and some have migrated to alien planets, regularly bringing needed supplies from the Earth.
But there is a group of people on earth who persist. They believe that mankind can definitely win, and emigration is definitely not the best choice.
Humanity will not perish and human civilization will not be interrupted!
Intention: Humanity will not perish and human civilization will not be interrupted!