"Mobile Suit Gundam SEED Frame Astrays" is a manga series set in the Cosmic Era timeline, serving as a side story to the "Mobile Suit Gundam SEED" anime. The narrative unfolds concurrently with the events of the main series, expanding on the conflict between the Earth Alliance and the Coordinators of ZAFT. The story primarily revolves around the exploits of the mercenary group Serpent Tail and their interactions with various factions, including the Earth Alliance, ZAFT, and the Orb Union.

The protagonist, Lowe Guele, is a junk dealer and pilot of the Gundam Astray Red Frame. Lowe's journey begins when he discovers the Red Frame in the debris of Heliopolis, a neutral colony destroyed during the war. Alongside his companions, the skilled pilot Gai Murakumo and the enigmatic priestess Kisato Yamabuki, Lowe becomes embroiled in the larger conflict. The trio operates under the banner of Serpent Tail, undertaking missions that often place them at odds with both ZAFT and the Earth Alliance.

A central element of the story is the rivalry between Lowe and Gai, who pilots the Gundam Astray Blue Frame. Their dynamic is marked by mutual respect and competition, as both seek to prove their skills in battle. The narrative also introduces the Gundam Astray Gold Frame, piloted by the mysterious Rondo Gina Sahaku, a figure with ties to Orb's aristocracy and a hidden agenda. The Gold Frame's advanced technology and Rondo's cunning make her a formidable adversary.

The plot explores themes of loyalty, identity, and the moral ambiguities of war. Characters frequently grapple with their roles in the conflict, questioning the motives of their superiors and the broader implications of their actions. The manga delves into the political machinations of the Orb Union, revealing its internal struggles and the lengths to which its leaders will go to maintain neutrality. The Orb-based organization Librarian Works, led by the enigmatic Canard Pars, plays a significant role in the latter half of the story, seeking to exploit the war for their own ends.

The series features a wide array of mobile suits, with the Astray frames taking center stage. These machines, derived from the original GAT-X series, are highly customizable and reflect the personalities of their pilots. Battles are frequent and intense, showcasing the technological advancements of the Cosmic Era and the tactical prowess of the characters.

"Mobile Suit Gundam SEED Frame Astrays" provides a deeper understanding of the Cosmic Era's conflicts, offering a fresh perspective on the events of "Gundam SEED." The manga enriches the lore with its focus on secondary characters and factions, while maintaining a strong connection to the overarching narrative of the Gundam universe.