Well In 2020 the dynamics of the world changed. Suddenly supers emerged through a laboratory experiment. They escaped and since then repopulated. To stop this a bunch of nuclear bombs were unleashed to the area they were at because of the risk they pose as bullets couldn't harm them and the leader of a certain country and the rich feared for their life and ordered the dropping of said bombs. This story would've normally ended here.
But being as they were, individuals, they they separated and dispersed corrupting the locals with knowledge of the forbidden. And only a few but quickly increasing like a sickness sent to the world. Unfortunatly as the leader of said country couldn't get the people to drop the nuclear bomb in residential areas fast enought it was too late for that country they decided.
The rich, the powerfull, and the special, finally got those under them by force to drop said bombs. As with conflict with differing countries goes, with communication between them so little, especially with something so important obviously caused misunderstandings. Now multiple bombs were unleashed each bigger then prior. Fortunately for the rich and powerfull, their bunkers withstood, sadly for the poor and weak.
Now many years later the supers being the socially and educationally deprived lab rats they were, never seeing the sun until their lucky escape, survived. Unfortunately they were spread out. They lived with the radiation and they and their offspring adapted to it as they normally do. Their genes were already mutated enough as it was from their days in the lab.
They created tribes but barely progressed further, until one day our first protagonist was born.