In the basement of a building behind the stage, Reiner Braun reunites with Eren Jaeger for the first time in four years. On his way home from the Warriors' headquarters, Falco meets a wounded soldier who wants to speak with him. Meanwhile, Falco Grice continues to struggle with his Warrior training, becoming more and more convinced that he has no hope of inheriting the Armored Titan and saving Gabi Braun's life. The Warriors lost hope for their mission after Marcel's death, but Reiner's determination to live and succeed spurred his comrades on. Reiner's shock was worsened when, shortly afterward, a Titan consumed Marcel. On their journey to the wall, Reiner learned that Marcel set him up to inherit the Armored Titan instead of his brother.

He recalls his final days in Warrior training when he, Bertholdt Hoover, Annie Leonhart, and Marcel Galliard were sent to Paradis Island to reclaim the Founding Titan. Faced with many struggles and shortcomings, Reiner's dream kept his resolve alive. Reiner Braun recalls his youth when he trained as a Warrior so that his Eldian mother and Marleyan father could live together. There, the Tybur family, holders of the War Hammer Titan, will announce the plan to take Paradis Island. The next day, Zeke Jaeger informs the Warriors and Colt Grice of an upcoming festival in Liberio, where dignitaries will be invited from abroad. Reiner Braun shares some of his experiences on the island, confusing his cousin, Gabi, when he refers to meeting 'all sorts of people' there rather than universally condemning them. The Warriors and Warrior candidates return home to Liberio where they are reunited with their families. However, taking the island will be difficult as none of Marley's ships have returned for the past three years, making it clear that Paradis Island controls at least two of the Nine Titans. Marley plans to revive the Paradis Island Operation to capture the Founding Titan to buy a few more years for their military to restructure and modernize for a post-Titan reality. Given how narrowly Marley achieved victory over the Mid-East Allied Forces, it is clear to Marley's military leaders that the era of their country's domination via Titan warfare is coming to an end. A peace treaty is signed, but the battle's outcome reminds Marley of the growing need to acquire the Founding Titan. With the fort secure, Zeke uses his Beast Titan's pitching to sink the naval fleet stationed nearby, however, artillery fire from the ships heavily damages the Armored Titan.

The Armored Titan joins the battle, destroying the remaining anti-Titan artillery with the Jaw.

Zeke Jaeger uses his Titan power to transform Eldians into Pure Titans, creating a powerful airstrike. The deployment of Galliard and Pieck clears the Mid-East trenches, which allows their airborne operation to begin. Warrior candidate Gabi Braun is approved to destroy it by Marleyan Commander Magath, which she succeeds in through the use of perfidy. The presence of an armored train prevents Marley from deploying its Titans. Warrior candidate Falco Grice is saved by his brother Colt, who returns him to the trenches nearby. Marley besieges Fort Slava, aiming to end their four-year conflict with the Mid-East Allied Forces sparked by their defeat in Shiganshina.

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