Terra Formars never asked you to get attached, and this is where that stinginess pays off. Two episodes pulled straight from volumes 21 and 22, and for once the war isn't stranded on Mars: it comes home to the planet that fired the first algae and cockroaches into orbit six centuries ago. You know the rhythm by now. The freeze frame, the donor organism introduced like a wrestling entrance, the Bugs Procedure kicking in, then something bursts across the frame in a spray of chitin. Being an OVA means no broadcast shadow bars politely eating the carnage. People here are load-bearing beams rather than characters, and the story steps over the ones that snap without breaking stride, which is exactly what you signed up for after watching Annex I squads turn on each other over national orders.

The Mars expedition is drawing to a close, but a small band of Terraformars, the humanoid cockroaches that overran the red planet, makes it to Earth and carries the conflict home. The Annex I members who survived join forces with fresh recruits to stop the roach threat from spreading across Earth. The two-episode action horror sci-fi OVA adapts the Earth arc from volumes 21 and 22 of the manga, and each episode was released alongside one of those volumes.