Before the fallout, Professor Kray dedicated to build the best ecosystem for the capybara and all the living being. Suddenly nuclear war happen and every rich and politician is hide inside the vault. Professor kray is left behind on the ground....

Now in the era of fallout, Professor Kray is left behind in the ruin of nuclear waste, he had to help the community to survive! He invented the serum to survive the humanity in post war, seeking for the clue of what caused the nuclear war, and seek revenge to his capybara