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...

Pursued by Division 4, Akari and Michelle encounter a Terraformar with bullet ant characteristics. Realizing this creature has stolen her deceased father's strength, Michelle stands her ground alongside Akari. The two will be pushed beyond their limits in this fight, but even more formidable opponents are lining up to fight them, and their human enemies are still out there as well...