Attack on Titan (Japanese: 進撃の巨人, Hepburn: Shingeki no Kyojin, lit. "The Advancing Giants") is a Japanese manga series written and illustrated by Hajime Isayama.
It is set in a world where humanity lives inside cities surrounded by three enormous walls that protect them from the gigantic man-eating humanoids referred to as Titans;
the story follows Eren Yeager, who vows to exterminate the Titans after a Titan brings about the destruction of his hometown and the death of his mother