In a post-apocalyptic future where only a fraction of humanity has survived to live humbly amongst the rubble, Eren dreams of more. His brainy friend Armin tells tall tales about deserts and oceans beyond the massive walls that guard their civilization, and his girlfriend Mikasa is equally entranced by the birds that soar over those untouchable barricades. Unfortunately, Eren's wish to see the walls opened to the outside world comes at a devastating cost. Enormous humanoid monsters called "Titans" come stampeding through the walls and immediately start eating every man, woman, and child they can find.
In the aftermath of the tragedy, Eren joins the newly minted "Titan Survey Corps" alongside hundreds of other young adults. Some of these new soldiers are hungry for revenge, but most are just plain hungry due to the ensuing famine. While facing down his demons and fighting through past trauma, Eren will have to rediscover what "freedom" means to him in a new world ruled by fear.