In the year 2105 of the Gregorian calendar, a doomsday crisis disrupted the entire world.
Humanity has experienced attacks by viruses, nuclear explosions, and alien species... After more than a century of struggle, we have established today's five major cities...
The confusion of genes and the influence of nuclear radiation began with the birth of the think tank. Human beings gradually realized the power of genes, so humans were divided into three classes. Outside the five cities, there was a group of aliens who were not accepted by humans. They were severely radiated and contaminated. They were called borderlings. They were not accepted by humans and were not aliens... Miracle was an alien of a different kind. She was the product of the combination of humans and borderlings. From the moment she was born, she was destined to be extraordinary...