Two years after the breach of Wall Maria, humanity fights back. Eren Yeager, who survived the massacre of his hometown of Shiganshina by vowing to exterminate every Titan, has discovered a terrifying power within himself: the ability to transform into a sentient, rage-fueled Titan. Following the disastrous mission to retake the outer wall, Eren is captured by the Military Police, led by the ruthless Kubal. They see him as a threat to the fragile order maintained by humanity’s rulers, who keep the populace cowed and living in fear behind the walls. As the authorities prepare to execute him, a massive, armor-plated White Titan crashes through the compound. The creature ignores the other soldiers, seizes the bound Eren, and vanishes into the wasteland.

Eren awakens in a sterile white bunker, a relic of the world before the Titans. There he meets the enigmatic Shikishima, a rogue captain with his own private army and access to forbidden pre-apocalypse technology. Shikishima reveals the secret the government has hidden for a century: the Titans were not a natural disaster but a man-made one. They were the result of a military experiment to create the perfect soldier, a biological weapon that spiraled out of control. A virus spread, turning ordinary people into mindless man-eating giants, and the ensuing chaos led to a global war that destroyed civilization. The current society, living in terror behind the walls, is a lie maintained by a corrupt government to keep humanity enslaved.

Meanwhile, the remaining members of the Scout Regiment—Mikasa Ackerman, Armin Arlert, the Titan-obsessed scientist Hans, and the cynical Jean—refuse to abandon their mission. They push forward toward the gaping hole in the outer wall, carrying a massive bomb intended to seal it forever. Their goal is to destroy the threat, but Shikishima has a different plan. He reveals that his true intention is not to seal the wall, but to use Eren’s power and his stockpile of weapons to destroy the inner walls instead. By unleashing a horde of Titans on the heart of human civilization, he hopes to spark a violent revolution that will overthrow the oppressive regime, regardless of the human cost.

As the Scouts reach the breach at Monzen, the plan collapses into chaos. Shikishima transforms, revealing himself as the White Titan, a creature of immense strength covered in impenetrable armor. Eren, rejecting Shikishima’s genocidal idealism, transforms into his own Titan form to stop him. The two colossal beings clash in a brutal, martial arts-style battle among the ruins of the old world. The fight is interrupted by Kubal, who, having survived the earlier attack, reveals his own monstrous nature. He injects himself with Titan spinal fluid and transforms into the towering Colossal Titan, determined to crush the insurrection and maintain the government’s control.

In the final confrontation, Eren is overwhelmed by the Colossal Titan’s size and heat. With time running out and the bomb damaged, the dying Shikishima has a change of heart. Recognizing Eren as the hope he never was, the White Titan seizes the bomb and flies it directly into the Colossal Titan’s mouth, detonating it in a massive explosion that kills them both and finally seals the gaping hole in the wall. As the smoke clears, Eren, Mikasa, and their surviving friends climb to the top of the newly repaired wall. For the first time in a century, the wall no longer represents a cage. Beyond it, stretching out to the horizon, they see the ocean and the ruins of a lost world, finally free to discover the truth for themselves.