Humanity's Comeback arc

 is the second story arc of the Attack on Titan anime.

Introduction
After witnessing the horror of the Titans, Eren Yeager, Mikasa Ackerman and Armin Arlert decide to undergo military training and enroll into the army as members of the 104th Training Corps. There, they get to know the rest of the trainees and slowly begin to understand the hardships of being a soldier.