Eren Yeager and others from the 104th Training Corps are only beginning to join the Survey Corps when an invasion of Wall Rose interrupts their preparations for another confrontation with the Titans. The Corps must rush to defend the wall, but the attack presents mysteries beyond the immediate threat.
Humanity has already lost its outermost defense. After more than a century of protection behind three great walls, the appearance of the Colossal Titan and Armored Titan brought down Wall Maria, forcing survivors to retreat behind Wall Rose. Now, while fighting to save that remaining refuge, the Survey Corps uncovers new information about the invading Titans—and dark secrets involving its own members.
