The world collapsed under the onslaught of human genius and human madness. Billions died in the all-consuming Last Attack. But humanity survived. After going through decades of battle, pain and darkness, the remaining states on earth have made a peace that no one expected. A group of free mercenaries penetrates the territory of the beast people to obtain a regulator for a thermonuclear reactor in a pre-war underground complex. Consciously violating the peace treaty, they are ready to face any dangers in order to save the floating island and hundreds of thousands of inhabitants.