Story
A world where Titans control everything. Humans, who have become food for the Titans, have built giant walls 50 meters high to prevent invasion, in exchange for their freedom to go outside the walls....

Eren Yeager is a 10-year-old boy who dreams of the world outside the walls that he has yet to see. Eren feels out of place among the people satisfied with the temporary peace who have given up on going to the outside world. Eren calls them 'livestock'. And the people feel that Eren is 'foreign'.

However, Eren's 'dream' and the people's 'peace' are both suddenly shattered by the appearance of a Colossal Titan that surpasses even the height of the walls....