Unarmed and overwhelmed by the Titan assault on the castle, the only hope for the Scouts may lie in a promise and a secret.

Utgard Castle comes crumbling down as Ymir desperately battles the Titans. Now, Christa must fulfill the promise they made long ago during winter training.

With a new enemy revealed, Eren and the Scouts fight back using all the techniques at their disposal.

The battle continues as Eren and the Scouts face many hard decisions. Who is the real enemy? What is the war really about? And what will the future hold for mankind?

Though it's met with hope and despair, the truth is made public. The Scouts then venture beyond the walls to see if it's everything they dreamed of.

As Paradis deals with the aftermath of the raid on Liberio, Armin looks back in the past to meeting the volunteer soldiers who reshaped their world.