Everyone is a suspect in the investigation to find out who killed the two test subject Titans. Meanwhile, the Cadets pick which corps they'll join, but after the tragic events of the Trost attack, many are uncertain which branch to choose.
As the Scout Regiment pushes toward Shiganshina, they encounter an intelligent Titan unlike any they've seen before. When Armin hypothesizes that it's really a human that's been turned into a Titan, he, Jean, and Reiner attempt to stop it.
As the Female Titan tears its way through the Scout Regiment, Levi makes a bold decision to split the ranks and send Eren and the supply wagons through a huge forest.
A memory of Eren testing out his Titan powers sheds light on how his abilities work. As the Female Titan slaughters members of the Scout Regiment, Eren is faced with a difficult decision: does he trust his teammates or act out on his own?
The Female Titan has been captured. Erwin's goal is to find out who the human is lurking inside. Meanwhile, the Scouts realize the reason Levi told no one about their true mission outside the wall is because of a spy among their ranks.
After watching Eren get swallowed by the Female Titan, Mikasa and Levi follow the monster in the hopes that he's still alive inside her. As the Scout Regiment tries to recover from the brutal losses of the operation, emotions run high.
After the failed scouting expedition, Eren and his superiors are summoned to the capital. Annie sees just how deep corruption runs in the Military Police and agrees to join Armin in a plot to defy the government-but nothing is as it seems.
When the identity of the Female Titan is finally revealed, she goes on a rampage within Wall Sina. Eren is hesitant to fight her, but Armin and Mikasa throw themselves into the battle in a desperate attempt to stop the towering monster.
Eren goes head-to-head with the Female Titan in a fight that demolishes Stohess District inside Wall Sina. As the number of casualties multiplies and Annie tries to escape over the wall, Erwin must deal with the consequences of his plan.
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?