"Mobile Suit Gundam Seed Destiny Special Edition" is a condensed retelling of the 2004-2005 anime series "Mobile Suit Gundam Seed Destiny," re-edited into four feature-length episodes. The story is set in the Cosmic Era, a timeline where humanity is divided between Naturals, who are unmodified humans, and Coordinators, genetically enhanced individuals. Tensions between these groups escalate into a conflict involving the Earth Alliance, led by Naturals, and the space-based PLANTs, governed by Coordinators.

The narrative begins with Shinn Asuka, a young Coordinator from the PLANT colony of Orb, who joins the military faction ZAFT after his family is killed during an attack by the Earth Alliance. Shinn pilots the advanced mobile suit ZGMF-X56S Impulse and becomes a key figure in ZAFT's efforts to combat the Earth Alliance. His motivations are deeply personal, driven by a desire for revenge and a belief in protecting his people. Alongside Shinn is Athrun Zala, a returning character from the original "Gundam Seed" series, who struggles with his role in the conflict and his loyalty to ZAFT. Athrun pilots the ZGMF-X23S Saviour and later the ZGMF-X19A Infinite Justice, serving as a mentor figure to Shinn while grappling with his own moral dilemmas.

The Earth Alliance, seeking to dominate both Naturals and Coordinators, develops powerful mobile suits known as Gundams, including the GFAS-X1 Destroy, a weapon of mass destruction. The Alliance's actions provoke further hostilities, leading to large-scale battles across Earth and space. The Orb Union, a neutral nation, becomes entangled in the conflict as its leaders, including Cagalli Yula Athha, attempt to mediate peace while facing internal and external threats.

Kira Yamato, the protagonist of "Gundam Seed," returns as a central figure in "Destiny." Initially reluctant to rejoin the war, Kira pilots the ZGMF-X10A Freedom Gundam to protect his loved ones and prevent further bloodshed. His actions often clash with Shinn's, creating a dynamic of rivalry and ideological conflict. Kira's pacifist stance contrasts with Shinn's aggressive pursuit of victory, highlighting the series' exploration of war, morality, and the consequences of violence.

The plot intensifies as ZAFT's leader, Gilbert Durandal, unveils the Destiny Plan, a controversial initiative to genetically engineer humanity's future. This plan sparks a final confrontation between ZAFT, the Earth Alliance, and Orb, with Kira, Athrun, and Shinn at the center of the conflict. The series concludes with a climactic battle that determines the fate of the Cosmic Era and the future of humanity.

"Mobile Suit Gundam Seed Destiny Special Edition" retains the core themes of its predecessor, including the cost of war, the struggle for identity, and the clash between ideals and reality. The condensed format streamlines the original series' narrative, focusing on key events and character arcs while maintaining the intricate political and personal dynamics that define the Gundam franchise.