Humanity's Comeback arc

The Humanity's Comeback arc (人類の再起) is the second story arc of the Attack on Titan anime.

Introduction
After witnessing the horror of the Titans, Eren Jaeger, Mikasa Ackermann, and Armin Arlelt decide to undergo military training and enroll into the army as members of the 104th Cadet Corps. There, they get to know the rest of the cadets and slowly begin to understand the hardships of being a soldier.