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Attack on Titan
Attack on Titan is a Japanese manga series written and illustrated by Hajime Isayama. It is set in a world where humanity is forced to live in cities surrounded by three enormous walls that protect them from gigantic man-eating humanoids referred to as Titans; the story follows Eren Yeager, who vows to exterminate the Titans after they bring about the destruction of his hometown and the death of his mother. (from Wikipedia)

Eren Yeager  is a member of the Survey Corps, and the main protagonist of Attack on Titan. He lived in Shiganshina District with his parents until the fall of Wall Maria, where he impotently witnessed his mother being eaten by a Titan.This event leads to Eren's intense hatred towards the Titans as he swore to wipe all of them off the face of the Earth. (from Attack on Titan Wiki)