Shingeki no Kyojin Season 2

After the battle with the Female Titan, Eren and the Survey Corps barely have time to recover before impossible news arrives: Titans have appeared inside Wall Rose, yet nobody can find where the wall was breached. Soldiers scatter to search for the opening and evacuate villages, but every step produces another mystery instead of an answer. Some members of the 104th are hiding truths far more dangerous than Eren imagined, and the enemy can no longer be treated as something that simply waits outside the walls. As trust inside the group begins to fracture and strange new Titans appear, Eren, Mikasa, and Armin start to see that the disaster is tied to the humans around them as much as to the creatures they hate.