The total circulation of popular Japanese manga series "Attack on Titan" in print and e-books has topped 100 million worldwide, publisher Kodansha Ltd. said Wednesday.Known as "Shingeki no Kyojin" in Japanese, with 30 volumes published as of December, its story revolves around protagonist Eren and his battle against giant creatures called Titans that have overrun the world.The manga by Hajime Isayama made its debut in 2009 in Kodansha's Bessatsu Shonen Magazine. It was adapted into a TV anime series that has been running in Japan since 2013.Kodansha said the series has been published in 21 …READ FULL ARTICLE