"Mobile Suit Gundam Narrative" is set in the Universal Century timeline, taking place three years after the events of "Mobile Suit Gundam Unicorn." The story revolves around the aftermath of the Laplace Incident, where the Earth Federation and the remnants of Neo Zeon clashed over the Laplace's Box, a secret that could destabilize the existing power structure. The conflict left behind unresolved tensions and the emergence of a new threat tied to the mysterious RX-0 Unicorn Gundam 03 Phenex, a mobile suit believed to be lost in space.

The narrative centers on three childhood friends: Jona Basta, Michele Luio, and Rita Bernal, who were part of a Newtype research program during the war. Rita, who piloted the Phenex, disappeared during a battle, leaving Jona and Michele haunted by her loss. Years later, the Phenex reappears, drawing the attention of both the Earth Federation and the rogue Zeon remnants. Jona, now a Federation pilot, is tasked with recovering the Phenex, while Michele, working for the Luio & Co. corporation, seeks to secure it for her own purposes. The Phenex, however, is not just a machine—it is tied to Rita's consciousness, which has merged with the mobile suit, creating a powerful and enigmatic entity.

As Jona and Michele pursue the Phenex, they are confronted by Zoltan Akkanen, a vengeful Zeon pilot who seeks to harness the Phenex's power for his own agenda. The story explores themes of loss, identity, and the lingering scars of war, as the characters grapple with their pasts and the consequences of their actions. The Phenex's reappearance triggers a series of escalating conflicts, forcing Jona and Michele to confront their unresolved feelings for Rita and the ethical implications of Newtype technology.

The plot unfolds through a mix of intense mobile suit battles and introspective character moments, highlighting the psychological and emotional toll of war. The Phenex's abilities, including its Psycho-Frame technology and near-mythical status, make it a central focus of the narrative, driving both the action and the philosophical undertones of the story. The film concludes with a climactic confrontation that resolves the immediate conflict but leaves lingering questions about the future of humanity and the role of Newtypes in an ever-evolving world.