Attack on Titan is a person.
Attack on Titan . 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 . An anime television adaptation produced by Wit Studio and Production I.G aired in Japan on MBS between April and September 2013 and a second season of the series premiered in April 2017 . As of April 2017 , the manga has 66 million copies in print .