The year is Universal Century 0093. Char Aznable has taken command of Neo Zeon, the rebels of outer space. He firmly believes that humankind can only achieve peace by relocating to space. Thus, he plans to crash the giant asteroid Axis into Earth and plunge the planet into an uninhabitable winter. Char also eagerly anticipates this opportunity to settle a 14-year rivalry with Amuro Ray. The two have been reluctant allies at times, but Char has never forgiven Amuro for causing the death of one of his comrades during the One Year War. Only the Earth Federation's Londo Bell Unit has the power to stop Char from fulfilling his dangerous goal. Leading the defense of Earth is veteran captain Bright Noa and Amuro Ray with the latest Nu Gundam mobile suit. In this thrilling conclusion to the original Gundam series, Londo Bell engages in a final conflict with Neo Zeon that will decide the fate of Earth and end this long-standing rivalry—once and for all. [Written by MAL Rewrite]

Based on the 15th episode of the original Mobile Suit Gundam series

Thanks to the sacrifices of war heroes like Amuro Ray, the Universal Century's 105th year sees an era of hard-won but short-lived peace. The Earth Federation keeps a militaristic hold on the planet and its surrounding space colonies. Although Char Aznable's rebellion against the neglectful Federation met its ultimate failure, his revolutionary philosophy of true freedom for all human beings lives on. Despite being the son of a famous Federation commander, Hathaway Noa embodies both the undying loyalty of soldier Amuro Ray and the militant passion of rebel leader Char Aznable. Haunted by memories of Char's Rebellion, Hathaway leads a dissident faction of his own known as Mafty. He adopts the alias "Mafty Navue Erin" and commits acts of violence in revolt against the growing tyranny of the Federation. After thwarting the hostile takeover of a plane by a terrorist group fraudulently claiming to be Mafty, Hathaway's secret identity is discovered by a young woman named Gigi Andalucia. Hathaway befriends both Gigi and Federation colonel Kenneth Sleg, but his double life endangers them as the armed conflict between Mafty and the Federation comes to a head.

—Do you know the Nejen? If you know it, then I'll take you there— The year is U.C. 0105. Twelve years have passed since the end of the second Neo Zeon War (Char's Rebellion). Even after "the Axis Shock," which seemed to indicate the future of humanity and the Universal Century, the world is still in a chaotic situation where intermittent military conflicts continue to break out. The Earth Federation government is more corrupt than ever, and its leadership has not only accelerated Earth's pollution, but also implemented an inhuman "Man Hunting" policy in which civilians are forcibly exiled to outer space. The anti-Federation government organization "Mafty," led by someone called "Mafty Navue Erin," has taken a stand against the corruption of the Earth Sphere. Mafty carries out fierce acts of terrorism, assassinating high officials of the Federation government one after another, but it gains a certain level of support from the populace who are growing more opposed to the Federation government. The person who calls himself "Mafty" and leads this organization is Hathaway Noa, the son of Bright Noa, an officer of the Earth Federation Forces who once participated in the One Year War. Hathaway himself joined the forces trying to stop Char’s Rebellion. With firsthand knowledge of the ideals and ideologies of Amuro Ray and Char Aznable, he has become a warrior following in their footsteps, and plans to clear a path forward through armed resistance. His destiny, however, is drastically altered as he encounters the Federation Forces officer Kenneth Sleg and a mysterious young beauty named Gigi Andalucia.