For centuries, humanity has been hunted by giant, mysterious predators known as the Titans. The last remnants of human civilization retreated behind enormous concentric walls, living in relative peace. However, this fragile calm is shattered when a colossal Titan breaches the outermost wall, allowing smaller Titans to invade. Young Eren Yeager witnesses the horror firsthand as his mother is eaten. He dedicates his life to eradicating the Titans by joining the Survey Corps, an elite military unit that combats the giants outside the walls. Alongside his childhood friends Mikasa Ackerman and Armin Arlert, Eren uncovers dark secrets about the Titans, their own history, and the true nature of their walled world.