In C.E. 73, tensions between Naturals and Coordinators continue to persist, eventually leading to another war between the Earth Alliance and PLANT. Sven Cal Bayan is a Natural pilot of the elite EA squad, the Phantom Pain, and carries out his squad's various anti-Coordinator missions without fail. Selene McGriff is a Coordinator researcher at the neutral Deep Space Survey and Development Organization (DSSD) and a developer of the GSX-401FW Stargazer space exploration mobile suit. Though their backgrounds are completely different, the expanding war will nevertheless force their paths to collide.
 
(Source: Anime News Network)

C.E. 73: While the second battle of Yachin Due brought the war between the Naturals and Coordinators to a close, tensions between the two races are at an all-time high. During a meeting between PLANT Chairman Gilbert Dullindal and Orb Representative Cagalli Yula Athha, a unit of soldiers hijack ZAFT's newly developed Gundams. ZAFT soldier Shinn Asuka along with his friends at the ZAFT ship Minerva sortie in attempt to deter this hijacking. With the assistance of Cagalli's bodyguard, Athrun Zala, the Minerva chases after the unknown ship that hijacked the Gundams until an even greater problem occurs leading to the start of the second Bloody Valentine war.
 
Note: On March 2013, the airing of the HD Remaster began. Like the HD Remaster of Gundam SEED, the remaster of this series not only improves the animation, but also alters lines and scenes from the original, as well as introducing brand new mobile suits. The episode count for the remaster was 50 episodes. The recap episode "Refrain" was completely omitted from the HD Remaster, while the final episode divided into two parts: "Final Power" and "The Chosen Future", based on the "The Chosen Future" television special, with additional footage.

In 2007, a special manga epilogue, authored by Naoki Moriya, was published. In it, the previously uncertain fate of Selene and Sven is revealed as they are shown to be alive and mostly unharmed from their ordeal. Sven joins the DSSD

The story takes place in unnamed timeline, where humanity has highly advanced technology. However, the human population is decreasing and it seems that they're on their way to extinction. 
The protagonists are Leos Alloy, Sthesia Awar and their Haro. They work on a Jupiter base called "Jupiter X", using "General Answer" (or "GA") which contains a massive repository of data about the alternate history of Humanity, Leos travels to the Earths' of the alternate timelines in an effort to collect data that might give them a hint for the evolution of mankind. 
(Source: Gundam Wikia)

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