In the year 2436, the surface of the earth is an immense desert without any signs of life except for the 'mutants .' This was all caused by the Global Nuclear War. And now, only a small percent of humans could survive underground in poor condition.

Jona, the Worker M04-1891, is just like everyone else. He works every day to get enough food to live. One day, Jona discovered that he's a mixture of mutant and human by coincidence. When he shows his mutant side, the only thing he knows is to kill and revenge.

What will happen to this unusual boy? Can he control his desire to kill?