進擊的巨人
Other "Attack on Titan"-related manga or light novels were also adapted into anime. Two OVA episodes, based on the "Attack on Titan: No Regrets" prequel manga, were bundled with the 15th and 16th volumes of the main series, released on December 9, 2014, and April 9, 2015, respectively. An anime television adaptation of "Attack on Titan: Junior High" began airing in October 2015. The series was directed by Yoshihide Ibata at Production I.G. A three part OVA of "Attack on Titan: Lost Girls" was released in 2017 and 2018 with the limited editions of volumes 24, 25, and 26.