A prequel series to the number one bestseller in Japan. Humankind is down to just a few thousand people who live in territory surrounded by three concentric walls. The walls protect them from their enemies, the ravenous giants known as the Titans. The Titans appear to have only one purpose: to consume humanity. This prequel tells the story of how humanity's greatest warrior, fan favorite Levi, got out of the slums and into the Survey Corps.