Whereas the main story of Mobile Suit Gundam SEED focuses on the struggles between the Earth Alliance, ZAFT, and Orb Union, the Astray series is focused on the three MBF-P0x mobile suit prototypes (however mainly on Lowe Guele) and their respective pilots and organizations, who mainly exist on the outskirts of the main SEED storyline. The MBF-P02 Astray Red Frame is piloted by Lowe Guele of the Junk Guild, and the MBF-P03 Astray Blue Frame is piloted by Gai Murakumo of the mercenary group Serpent Tail. The third Astray, MBF-P01 Astray Gold Frame, is piloted by the primary antagonist of the Astray story, Orb nobleman Rondo Ghina Sahaku, and later by his twin sister Rondo Mina Sahaku.

In the first short, Lowe Gear and the Junk Guild make a stop at an mobile suit parts auction on Earth where Lowe purchases a head taken from a modified BuCUE suit which, when attached to the arm of his Red Frame Astray, acts as a dual beam saber. Lowe tries to decrypt some combat data contained in the head, but is shortly engaged by, and goes into combat with, several ZAFT suits including a CGUE DEEP Arms. In the second short, Blue Frame pilot Gai Murakamo engages and, with the help of his fellow Serpent Tail mercenaries, traps a GINN High Mobility Type. He then faces off with the legendary Edward Harrelson, who pilots a Sword Calamity Gundam and has just finished destroying a fleet of ZAFT ships.
 
(Source: Anime News Network)

After having finished a job at Research Colony Mendel, a mysterious mobile suit approaches the colony--likely with hostile intent. When Lowe Gear intercepts in the Red Frame, the pilot opens fire... and thus begins another exciting adventure set in the popular Gundam Seed universe! Mobile Suit Gundam SEED X Astray continues where Gundam Seed Astray R left off!
 (Source: Tokyopop)

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)

A rebuild of "Gundam SEED Astray" and "Gundam SEED X Astray," reshuffling chapters in the chronological story order, as well as including new Re:Master chapters. Note: Includes 3 extra chapters.

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