Attack on Titan is a person.
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 22 tankōbon volumes as of April 2017 . The story initially centers on Eren Yeager , his adopted sister Mikasa Ackerman and 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 narrative shifts to encompass Historia Reiss , squad leader Levi , Eren 's father Grisha , and other supporting characters . Attack on Titan and all five spin-off manga are published in North America by Kodansha Comics USA , while the three novel series are published by Vertical .