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Following the Ryunka disaster, Tokyo is left in a period of social turmoil. To make matters worse, the group of aliens directly responsible for the catastrophic event have escaped from the Space Federation and are hiding on Earth. Still sharing a body, Space Federation officer Birdy Cephon Altera, and high schooler, Tsutomu Senkawa, are tasked with capturing the fugitives and bringing them to justice. However, an unexpected crisis develops when the outlaws become targets of an unknown assassin with a vendetta. Now Birdy must deal with the chaos of everyday life and also uncover the identity of the assassin before more escapees fall victim. [Written by MAL Rewrite]

During the 21st century, humanity attempted to colonize Mars by sending two species which could endure the harsh environment of the planet to terraform it—algae and cockroaches. However, they did not anticipate the species' remarkable ability to adapt. Now in the 26th century, a lethal disease known as the Alien Engine Virus has arrived on Earth, and the cure is suspected to be found only on Mars. The problem is, Mars in the present is overrun by creatures known as "Terraformars," incredibly powerful and intelligent humanoid cockroaches that mutated from those originally sent to the planet. The Annex I team, consisting of a hundred men and women genetically enhanced with characteristics of powerful organisms from earth, has been sent to Mars on a mission to find the cause of the Alien Engine Virus and to help cure humanity—signalling the start of the crew's fight for survival. [Written by MAL Rewrite]

In Terra Formars Revenge, the crew members of the Annex I continue to fight against Terraformars—the large humanoid cockroaches that evolved from the ones sent to Mars centuries ago. However, far from discovering the cure for the lethal Alien Engine Virus that has been plaguing Earth, the Annex I team have learned that some squadrons have agendas from their own countries. Now, the squadrons must not only fight against the Terraformars for their survival, but also each other in the never-ending battle for international dominance. [Written by MAL Rewrite]

During the 21st century, humanity attempted to colonize Mars by sending two species which could endure the harsh environment of the planet to terraform it—algae and cockroaches. However, they did not anticipate the species' remarkable ability to adapt. Now in the 26th century, a lethal disease known as the Alien Engine Virus has arrived on Earth, and the cure is suspected to be found only on Mars. The problem is, Mars in the present is overrun by creatures known as "Terraformars," incredibly powerful and intelligent humanoid cockroaches that mutated from those originally sent to the planet. The Annex I team, consisting of a hundred men and women genetically enhanced with characteristics of powerful organisms from earth, has been sent to Mars on a mission to find the cause of the Alien Engine Virus and to help cure humanity—signalling the start of the crew's fight for survival. [Written by MAL Rewrite]