The old era, the era before nuclear pollution, but one day Japan discharged nuclear sewage into the sea, triggering changes in the marine ecology and producing a large number of mutated creatures that are collectively known as "alien beasts" in later generations. The time after nuclear pollution is called the "Nuclear Age" and people's lifespans are greatly reduced and full of radiation. But newborns are miraculously immune to large amounts of radiation and can absorb and strengthen themselves. The survivors will be called "new humans" and have the strength to fight against "alien beasts". A new era begins. In the radiation realm of the void outside, people obtain equipment and guide methods of nuclear radiation. People who possess this power are called nuclear warriors, also known as physical warriors and legal warriors. He is the leader among the new humans and the main force against the alien beasts.
