In the late 26th century, overpopulation on Earth is reaching the breaking point, and humanity must find new frontiers. The terraforming of Mars has taken centuries but is now complete. The colonization of Mars by humanity is an epoch-making event, but an unintended side effect of the terraforming process unleashes a horror no one could ever have imagined...

In a bid to contact Earth for help, Keiji and the others from Division 1 infiltrate the Annex 1 and head for the communications center. With the release of Hong's bioweapon, the mission is dangerous even without the ongoing threat from the terraformars. Getting a message through to Earth may be the last chance anyone from the Annex 1 mission has to survive, but even if they can contact home base, will the leaders on Earth agree to help?