Two hours before the attack by the Titans at Castle Utgard, the 104th Trainees rest as their seniors keep watch. Connie mentions the Titan he encountered at his village resembled his mother, but Ymir plays it off. Reiner becomes suspicious when Ymir is able to read the unknown language on a food can. The Titans soon appear, and Nanaba and the Senior Scouts hold them off from the outside while Connie, Reiner, Bertoldt, Ymir and Krista defend themselves against smaller Titans that have breached the castle. In the process, Reiner has his arm badly injured after it is bitten by a Titan. After clearing the area of Titans, the Beast Titan throws chunks of Wall Rose at the castle, killing the group’s horses. A second wave of Titans subsequently attack the castle, and the senior soldiers are soon overwhelmed and killed. As the Titans surround the tower the unarmed Trainees are on, Ymir, in order to save Krista’s life and honor the promise they made, jumps off the tower, and transforms into a Titan.
Connie grieves for the death of his family while his senior Lynn tries to assure him they might be still be alive since no bodies nor blood was found despite Gelgar’s suspicions since the village horses are still at their stables. As Connie rejoins his group to find the breach in the wall, the Titan in his house speaks to him, saying “Welcome Back.” Elsewhere, Ymir asks her seniors Nanaba and Henning to allow her and Krista to leave their group since they don’t have their gear which the latter tells Ymir not to worry about her. Eventually, both groups meet up but are surprised to discover there were no breaches at the Walls and rest up at Castle Utgard. Meanwhile, Hange explains to Eren that she discovered the hardened crystallized skin that Annie created from her Titan form is the same material that the Walls are made of which might help them seal the breach at Shiganshina if Eren can learn to do the same thing. After witnessing the flight of the people of Wall Rose due to the Titans, Pastor Nick relents and tells Hange that a 104th Trainee can help her find the answers she seeks; this is none other than Krista. Following this, an out-of-breath Sasha arrives and hands Hange a report. Shortly thereafter Hange and her group head to Castle Utgard. In the meantime, Titans, led by the Beast Titan, attack Castle Utgard despite it being night time, forcing Gelgar, Lynn, Nanaba and Henning to defend the 104th Trainees.
Hange and Armin deduce that the Titans encased within the walls provide its strength. The Survey Corps depart from Stohess to deal with the Titans that appeared inside Wall Rose, and Hange takes Pastor Nick along intending to gain more information from him. Meanwhile, Sasha rushes to warn her father and her village. She arrives to find the entire village deserted except for a woman being eaten by a Titan, and her daughter nearby in a state of shock. Sasha takes the girl and flees but they are chased by the Titan. Sasha decides to stay and fight while urging the girl to run away. Sasha succeeds in blinding the Titan with her arrows just as a group of villagers, including her father and the girl, return to pick her up. Meanwhile, Connie arrives at his village, only to find that it had already been attacked by Titans. Upon reaching his house, Connie discovers a Titan on its back trapped inside. He and the others wonder how it got so far from the walls when its short, thin legs seem too weak to support its body.
As the encased Annie is taken into custody, Hange and her team discover the Titan sealed inside the walls. Pastor Nick of the Wall Cult appears, urging them to cover it from sunlight. After the Titan is covered with sheets, Nick refuses to tell Hange why it is there, even after she threatens to kill him. She suspects that more titans are hidden within the walls. Meanwhile, Erwin is informed that Wall Rose was breached and Titans are roaming inside. 12 hours earlier, the rest of the 104th Trainees are stationed on an outpost when Titans are seen advancing from the south. Mike Zacharius orders the soldiers and trainees to spread out and inform the nearby villages and the capital about the Titans while he stays behind to delay them. In Stohess, Eren wakes up with Mikasa at his bedside and Armin tells them the Titans have breached Wall Rose. Back at the outpost, Mike buys enough time and prepares to escape, but is captured by a mysterious ape-like Titan covered in fur that is capable of speaking. The Beast Titan inquires about his three-dimensional maneuvering equipment but Mike does not answer, so the Titan strips Mike of his gear and leaves him to be eaten by the other Titans.
During the physical and mental tortures he suffers at the hands of Jason, Kaneki comes to accept his ghoul-half and fights back.
As his friends from Anteiku make preparations to rescue him, Kaneki is tortured by Jason, one of the members of the Aogiri Tree, whose hideout is stormed by the CCG.
Kaneki is kidnapped by members of Aogiri Tree, an underground ghoul faction who is interested in his connection with Rize. Meanwhile, Amon is introduced to his new partner, the eccentric and dangerous Juuzou Suzuya.
After the battle with Mado, Hinami starts living with Touka and Kaneki. Still mourning the loss of his partner, Amon is relocated to the 11th ward, where the police are having trouble facing some dangerous ghouls who do not fear them.