In a world where humanity lives confined behind enormous walls to protect itself from Titans, gigantic humanoid creatures that devour humans, Eren Jaeger dreams of discovering the world beyond them. When the sudden appearance of a Colossal Titan causes part of the defenses to fall, his life is turned upside down, and he decides to join the military alongside Mikasa Ackerman and Armin Arlert. Drawn into a desperate struggle for humanity’s survival, they gradually discover that the origins of the Titans, the history of the walls, and the world around them hide truths far more complex than they ever imagined.