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In 2042, alien threats known as the Mimetic beasts laid waste to Japan. During a final battle against the Mimetic beasts, Goh Saruwatari defeats the alien "boss" and saves his future wife, Anna Aoi, with his robot, the Dannar.
Now, on their wedding ceremony, the Mimetic beasts emerge after five years of tranquility. Goh and Dannar are called to action, forcing Goh to leave Anna at the altar.
As Goh struggles in his battle against the Mimetic beast, Anna stumbles upon a sealed robot known as "Neo Okusaer". She is able to activate and pilot the Neo Okusaer to save her "husband" by merging it with the Dannar to activate the Godannar's Twin Drive.
During the course of the series, it is discovered that humanity is threatened by the "Insania" virus, which is spread by the Mimetic beasts. All of humanity is infected, but the virus affects robot pilots most severely, since they come into close contact with the beasts on a regular basis. The virus has the effect of transforming human males into Mimetic beasts; females are somehow immune, unless they naturally generate large amounts of male hormones. The virus is stimulated by human hormones, especially those released in great quantities during combat.
During the second season, the pilots of Dannar Base struggle to balance the need to fight the Mimetic beasts with the danger of further infection. Eventually, it is discovered that Mira, Goh's former combat partner and lover, who was trapped inside a Mimetic beast for five years, is the source of the vaccine humanity needs.
The series is famous for its fanservice: 'up skirt' shots, bouncing breasts, and the scantily clad female pilots.
There was also a dōjinshi made by staff which was sold to fund the production of the second series.