Attack on Titan (進撃の巨人 Shingeki no Kyojin?, lit. "Advancing giants") is a Japanese manga series written and illustrated by Hajime Isayama, which is set in a world where the remains of the human population live inside cities surrounded by enormous walls due to the sudden appearance of the Titans, gigantic humanoid creatures who devour humans seemingly without reason. The story centers around the life of Eren Jaeger and his adoptive sister Mikasa Ackerman, whose lives are changed forever after the appearance of a colossal titan brings about the destruction of their home and the death of their mother.
Plot
The series follows the story of Eren Jeager, a young boy whose father disappears after his mother is killed during the fall of Wall Maria. Years later he enlists into the army, accompanied by his adopted sister Mikasa Ackerman and their childhood friend Armin Arlelt. When the Titans threaten to break further through Wall Rose, Eren discovers that he possesses the ability to temporarily transform himself into a Titan. Seen as a threat by some, and a ray of hope by others, Eren joins his companions in a war to protect what still remains of mankind, making use of his newfound power while looking for answers to the mysteries surrounding the Titans, the walls, and his own existence.