Several hundred years ago, humans were nearly exterminated by Titans. Titans are typically several stories tall, seem to have no intelligence, devour human beings and, worst of all, seem to do it for the pleasure rather than as a food source. A small percentage of humanity survived by walling themselves in a city protected by extremely high walls, even taller than the biggest Titans. Flash forward to the present and the city has not seen a Titan in over 100 years. Teenage boy Eren and his foster sister Mikasa witness something horrific as the city walls are destroyed by a Colossal Titan that appears out of thin air. As the smaller Titans flood the city, the two kids watch in horror as their mother is eaten alive. Eren vows that he will murder every single Titan and take revenge for all of mankind.
As Marley battles the Mid-East Alliance to end a four-year war, a group of Warrior candidates on the front lines compete to be the successor of the Armored Titan.
Though glad the war is over, both the Eldian Warriors and Marley brass realize that neither have a future unless they finish the job of retaking the Founding Titan.
Reiner reflects on his past, remembering what pushed him to become a Warrior and keep moving forward when all hope was lost.
A sudden visit from the Tybur family shakes up the Marleyan military. Meanwhile, Falco smuggles letters for a friend and helps two old comrades reunite.
While Willy Tybur reveals the truth in a shocking speech to the world, tensions rise behind the stage as Eren and Reiner meet face to face.
As the Attack Titan rampages, several people are crushed to death. While all of this is going on, the Warhammer Titan appears to confront Eren.