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.

Everyone is a suspect in the investigation to find out who killed the two test-subject Titans. Meanwhile, the cadets pick which military branch they'll be joining, but after the harrowing events in the Trost attack, many are uncertain which branch to choose.

The Female Titan has captured Eren after ripping him out of his Titan body, but Mikasa and Captain Levi give chase. Elsewhere, the Recon Corps begins preparations for the journey back home to the Wall with their numerous dead in tow.

Hange is insistent on capturing a Titan for the advancement of scientific research, but Erwin is adamant in his refusal to allow it. Will an unexpected discovery during an expedition beyond the walls alter the situation?