Captain Haruo Sakaki, Yuki Kaji, harbors a seething hatred toward Godzilla, the creature blamed for his parents' deaths during humanity's exodus from Earth. He believes Tau-e, the planet chosen for colonization, is uninhabitable and presses the ship's committee to scrap the expedition to send the elderly to scout the world. After a tense confrontation, he is arrested and soon witnesses the exploratory shuttle explode while entering Tau-e's atmosphere. In a bid to sway public opinion, he anonymously publishes a classified essay on Godzilla's weak points, provided by the Exif priest Metphies Takahiro Sakurai. The essay shifts the mood aboard the ship, and the central committee decides to abandon Tau-e and abandon the plan to relocate the elderly, opting instead to return to Earth in hopes of finding a viable home.
The Aratrum arrives in Earth orbit and dispatches reconnaissance drones to scan the surface, revealing that Godzilla is very much alive and still a force to be reckoned with. Metphies arranges Haruo's bail and explains the creature's vulnerability: Godzilla harbors an electromagnetic pulse–producing organ that generates an asymmetrical, permeable shield, rendering it impervious to most damage except during a short window when the organ recycles. The plan is to exploit that window to implant an EMP probe and trigger an implosion from the ensuing energy buildup. Haruo argues that success will require a tightly coordinated, close-quarters assault, and he calls for a troop surge of roughly 600 to execute the delicate strike.
As the two battalions descend to Earth's surface, they discover that nearly 20,000 years have passed due to relativistic time dilation. Godzilla's presence has drastically reshaped Earth’s biosphere, and the troops contend with new aerial threats known as Servums that disrupt their landing ships. Among the strategists on the ground is Daisuke Ono as Eliott Leland, who helps steer the campaign through the unfamiliar terrain and evolving danger. The expedition suffers heavy losses, but the survivors press on, adapting to a landscape where old maps no longer apply and where every move must reckon with a monster that seems nearly invincible.
Haruo pushes ahead with the original EMP plan, initially moving on his own before being challenged by the evolving chain of command. When Leland intervenes and provokes Godzilla, the confrontation ends in tragedy for the human side, and the body count becomes a grim teacher: Godzilla's dorsal fins prove to be the critical weak point. With the leadership shaken, command passes to Metphies, who elevates Haruo to commander as a way to unify the remaining fighters and urge them to persevere in the dangerous mission. The human group rallies around the plan and, despite mounting casualties, succeeds in maintaining pressure and momentum, convinced that their best chance to break Godzilla’s shield lies in a decisive, coordinated push.
In the climactic sequence, the troops corral Godzilla into a shattered mountain pass and manage to trap the giant within the collapsing rockwork. The trap succeeds in delivering a fatal blow to the monster, but the victory is tempered by grim revelation: what they killed appears to be an offspring, while the elder, original Godzilla lurks beneath the surface, having grown to about 300 meters in height. A fierce counterattack follows as the surviving crew attempt to evacuate, only to be overwhelmed by the larger menace. Haruo is left trapped beneath rubble, watching as the behemoth withdraws, and he collapses into unconsciousness with a vow burning in his chest: to kill Godzilla once and for all.
The post-credits moment hints at a new thread lingering beneath the surface: Haruo wakes in a secluded area and spots an indigenous girl standing nearby, suggesting that the struggle with Godzilla may be only the beginning of a longer, more enigmatic journey. The legacy of the mission—its moral questions, technological gambits, and the relentless human drive to survive—lingers as the saga leaves Earth forever altered and the men and women aboard the Aratrum confronting a future where old certainties no longer apply.
