Attack On Titan is one of the most popular and acclaimed anime series of all time. It is based on the manga of the same name by Hajime Isayama, which has sold over 100 million copies worldwide. The story follows a group of young soldiers who live in a world where humanity is besieged by giant humanoid creatures called Titans. The Titans have no intelligence or reason, and they devour humans for fun. The only thing that stands between them and the extinction of mankind is a series of massive walls that surround the last remaining cities.