Eren begins his training with the Cadet Corps, but questions about his painful past overwhelm him. When he struggles with a maneuvering exercise, Bertolt and Reiner offer kindly advice.

Plans are made to use Eren's Titan powers to seal the hole in the wall in an attempt reclaim Trost. But with the government's bloodstained history and vocal dissenters in the military ranks, the biggest threat to humankind may not be the Titans.

The Recon Corps moves Eren to an old abandoned castle where he will continue his training. Hange visits and reveals that she's been putting two captured Titans through a series of tests and trials — experiments that she wants Eren's help with.

With the Female Titan still chasing after Levi's squad, Eren considers turning himself into his Titan form, but Levi tells him to choose to be either a monster or a member of the Recon Corps. As Eren remembers what he has learned from the squad, he realizes that the danger and sacrifice they all share is not what binds them — it is trust. Now it is up to Eren to make the decision of who he will trust.