Attack on Titan

Attack on Titan is a manga series created by Japanese illustrator Hajime Isayama. It is set in a world where humanity lives within cities surrounded by enormous walls that protect them from gigantic man-eating humanoids referred to as Titans; the story follows Eren Yeager, who vows to retake the world after a Titan brings about the destruction of his home town and the death of his mother.

Attack on Titan Wikipedia