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.
With the Annex 1 cruising toward Mars, an eerie mood pervades the crew as they are debriefed on their role in combating the lethal A.E. Virus. Moments before arrival, a deadly presence onboard thrusts the crew into a collision course with the unknown
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.
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.
One crash landing and two near-deaths later, Akari, Michelle, and the rest of Squad 2 are shell-shocked-but alive. A rare moment of peace, and a healthy dose of carnal repression, leads Akari and Alex into trouble.
Adolf, leader of Squad 5, maneuvers the escape vehicle toward the Annex 1 crash site, but is abruptly knocked off course by an unfathomable foe who sends the crew hurtling into a rocky canyon.
All eyes are on Adolf as the terraformars close in for the kill. An outpouring of fury and heartache from the past materializes as lethal electricity, but it can't last forever.
Before collapsing at Eva's feet, Adolf channels divine annihilation to strike down the terraformars. But his attackers' ingenious resuscitation precipitates yet another attack. Will an unprecedented attempt at survival eventually favor the roaches?
In the depths of the canyon, a new match begins. But this time, the stakes are higher; it's Mars versus planet Earth in a contest of the species. With Squad 1 fragmented, one of Earth's best featherweights must take on the reigning champion of Mars, a colossally armored beast.
During a precarious clash atop a terraformar's web, Captain Komachi is haunted by a soul from the past and is ready to put the grim incident from the Bugs 2 project behind him. Meanwhile, deep within the pyramid, Squad 3 makes an unexpected discovery of an inexplicable object from decades past.
Squad 1 is in dire straits, but luckily Akari and Michelle are there to drive back the threat from the crew's most terrifyingly elusive foe yet. When Squad 1 is joined by Squad 2, a breakdown from within the team threatens to divert what seem to be steps to victory.
