Twenty years have passed since the doomed Bugs 2 mission, and a strange new disease is ravaging Earth; to save his friend from the malady, Akari Hizamaru enters an underground tournament only to find himself pitted against a savage foe.

Annex 1 heads to Mars in a bid to create a vaccine for the virus. Akari and the other crew members try to make the most of their time on the ship.

In the darkness of space, Annex 1 becomes a bloody backdrop for the terraformars' rampage; Akari and Michelle manage to push back before making a mad dash for the mutational serum, now almost completely destroyed.

Calm is fleeting for Captain Komachi and crew, who discover a bizarre stowaway on Mars; the confusion continues when an unlikely hero parries potential devastation from another terraformar ambush.

Alternating between melancholy and rage, emotions run high for Marcos as his reminiscing fuels an attack that leaves his teammates awestruck.

An omen of things to come arrives with a shattering of glass as one grotesquely developed terraformar takes control of the Squad 2 crew and their escape vehicle.