Attack on Titan vol 01-16 (Shingeki no Kyojin)

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. The series began in Kodansha's Bessatsu Shōnen Magazine on September 9, 2009, and has been collected into 15 tankōbon volumes as of December 9, 2014. It is set in a world where humanity lives inside cities surrounded by enormous walls as a defense against the Titans, gigantic humanoid creatures who eat humans seemingly without reason. The story initially centers on Eren Yeager, his adopted sister Mikasa Ackerman, and their childhood friend Armin Arlert, who join the military to fight the Titans after their home town is invaded and Eren's mother is eaten. However, as the story progresses and the truths about the Titans are slowly revealed to the reader, the main narrative shifts, centering increasingly more around Historia Reiss, one of the top soldiers from the Survey Corps and the youngest child of the ruling family within the walls, of which the long-kept secrets are directly connected to the origin of the Titans and the lost history of the world