The war is over, humanity has lost, and the Kaiju rule the earth. Three years have passed since the US government attempted to use giant mechs to fight off an incursion of kaiju. The eight most powerful kaiju have carved up North America into their respective territories and their mutant offspring also roam the continent. The remnants of humanity are gathered in a remote settlement with Steel Samurai, the last of the remaining mechs, as their only protection. The mech is piloted by Captain Chris Myers who realizes that humanity will not survive if they stay at the settlement. In order to preserve the human race, he leaves the settlement unprotected as he engages on a desperate plan to draw the eight kaiju into each other's territories. His hope is that the kaiju will destroy each other. Chris will encounter horrors including the amorphous Amebos, Tortiraus the Giant turtle, and the nuclear powered mutant dinosaur Atomic Rex! Will his quest save humanity or doom it to extinction?