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Liberio (レベリオ Reberio?) is a Marleyan city that contains an internment zone (収容区 Shūyō-ku?), a designated area of land for Eldians on the mainland to live in. It is the hometown (故郷 Kokyō?) of many of the Warriors as well as Grisha Jaeger.
The internment zone is separated from the rest of the town by a large wall, guarded by Marley Public Security guards, who have the task of controlling and authorizing who goes in and out of the internment zone.
Sometime before the fall of Wall Maria, Reiner Braun, Bertholdt Hoover, Annie Leonhart, and her father lived their days in a settlement which Reiner and Bertholdt would later refer to only as their "hometown." Before Annie departs from the hometown, her father reassured her that he would support her even if all the world hated her and that he would only ask that she would return home.
During their days spent in the 104th Cadet Corps, Reiner and Bertholdt claimed that their hometown lied in the southeastern mountainous region of Wall Maria and that their town had been overrun by Titans without warning during the fall of Wall Maria. Reiner in particular expressed a strong desire to return to his hometown in the future.
During the Wall Rose invasion when the Scout Regiment recruits battle the Titans at Utgard Castle, Reiner comes close to death by a Titan and fears for the end of his life before he is saved by Bertholdt. At this time he strengthens his will, filled with determination to return to his hometown. He shares his resolve with Bertholdt, who understands the true meaning of what Reiner says and agrees with his hopeful words.
The next morning, when Reiner begins to lose hope for his situation due to an injury inflicted on his arm at Utgard, Bertholdt encourages him by reminding him of their imminent return to their hometown. Not long afterward, the two reveal their Titan identities as the Armored and Colossal Titans and attempt to capture Eren Jaeger, whom they must bring to their hometown. They succeed in capturing him and escape to a Titan Forest.
While in the Titan forest, Reiner reminds Bertholdt that their most favorable course of action is to return Annie Leonhart, Historia Reiss, and the "Coordinate" to their hometown in order for their mission to be complete. Reiner also suggests that Bertholdt should confess his true feelings to Annie upon their return, but Bertholdt denies any such affections. Later, when Reiner and Bertholdt attempt to escape with their captives Eren and Ymir, they inform the others that Eren's life is not up for negotiation and that he is going to be taken to their hometown. Armin taunts Bertholdt at the thought of leaving Annie behind, causing him to attempt an attack and exposing a vulnerable moment for Erwin Smith to free Eren.
Ymir and the fleeing Warriors arrive in the ruins of Shiganshina District later that night, where Reiner lets Ymir know that her rescue is hopeless if they take her to their hometown. Ymir accepts her fate, believing that she owes Reiner and Bertholdt a favor for indirectly freeing her from her life as a Titan five years before.
In the aftermath of the Battle of Shiganshina District, the surviving members of the Scout Regiment learn of the existence of Liberio and the rest of the outside world through Grisha Jaeger's autobiographical writings, kept hidden in the basement of his former home.
Four years later, the nation of Marley is victorious against the Mid-East Allied Forces, and the Warriors and other Eldian forces return to Liberio by train, reuniting with their families inside the internment zone.
The injured Eldian soldiers are also taken to the internment zone's hospital. One of the current Warrior candidates, Falco Grice, meets a man named Kruger and grows to respect the soldier. He delivers numerous letters for Kruger to an unregulated postbox outside Liberio.
The Tybur family visits Liberio so Willy Tybur, the head of the family, can see the statue of Helos at the military's headquarters. He also meets with Commander Theo Magath and takes him into his confidence. Sometime later, Willy invites representatives from the world's nations to a festival in Liberio's internment zone.
The festival is held, with numerous people setting up stalls in order to impress foreign visitors. The people of the internment zone also partake in the celebration over the course of the day. At night, crowds of civilians, army officials, and foreign ambassadors gather to hear Willy's speech. Before the curtain rises, Falco Grice asks for a moment of Reiner's time, and leads him to a basement where "Mister Kruger," now identifiable as Eren Jaeger, awaits.
The curtain rises and Willy takes the stage, beginning his speech with a production recounting the history of the world, and the horrors of the Titans. In an interlude, the Warriors Pieck and Porco Galliard are summoned by a supposed Marleyan soldier, who later traps them in a confinement area.
Willy concludes his speech and as he gives a declaration of war, Eren transforms into the Attack Titan, emerging from the building behind Willy and crushing the stage. This attack sends debris flying into the crowd and kills Willy.
The Attack Titan begins a rampage, slaughtering key military personnel with little regard for collateral damage. The massacre sends pandemonium into the crowd, creating a human stampede as people rush to escape the area surrounding the stands.
Having survived the collapsed stage, Lara Tybur praises her brother's legacy and transforms into the War Hammer Titan to battle the Attack Titan. Meanwhile, Pieck and Galliard escape their confinement area with help from the Cart Titan's Panzer Unit.
The Scout Regiment begins their attack in earnest, shooting down the Marleyan infantry, as well as any armed Security Authorities in the area. A group of soldiers led by Floch Forster set fire to residential buildings. The Regiment blocks off roads and installs lights on top of buildings to direct their escape airship later.
The ensuing conflict wrecks havoc in the vicinity, with the Warriors generally controlling the flow of battle. Inside the relative safety of a building, Magath calls in thirty thousand soldiers stationed nearby. He instructs them to seal off the internment zone to prevent the escape of the enemy soldiers.
In the nearby harbor, the navy forces summoned to Liberio prepare to dock their battleships. The transformation of Armin Arlelt into the Colossal Titan prevents this, destroying the harbor and ships and sending a shock-wave into the internment zone. The battle continues with a reversal of dominance by the Scout Regiment when they incapacitate most of the Warriors and even appear to kill Zeke Jaeger's Beast Titan. The Scouts successfully retreat on the airship following the lights previously set by Jean Kirschtein's squad.
The next day, the Marleyan military is seen excavating the site for victims, which includes children. The hardened remains of the War Hammer Titan looms over the carnage. At the site of Zeke's "death", they can only find his limbs, suggesting that he faked his demise.