Attack on Titan a.k.a Shingeki no Kyojin
is a Japanese manga series written and illustrated by Hajime Isayama. The series began serialization in Kodansha's Bessatsu Shōnen Magazine on September 9, 2009, and has been collected into 11 tankōbon volumes as of August 9, 2013. Set in a world where humanity lives inside cities surrounded by enormous walls due to the Titans, gigantic humanoid creatures who devour humans seemingly without reason. The story centers on Eren Jaeger, his adoptive sister Mikasa Ackerman, and their friend Armin Arlert, whose lives are changed forever after the appearance of a colossal titan brings about the destruction of their home town and the death of Eren's mother. Vowing revenge and to reclaim the world from the Titans, Eren, Mikasa and Armin join the Survey Corps, an elite group of soldiers who fight Titans outside the walls.