Shingeki no kyojin: saigo no kogeki

Humanity lived quietly in the shadow of huge walls built as protection from the Titans - giant man-eating creatures. But then the century of peace came to an abrupt end with a Titan attack, which also robbed the boy Eren of his mother and made him swear revenge on the Titans.
Years later, after joining the Recon Squad, Eren faced a deadly enemy and gained a special ability that revealed a new truth about the world as he knew it.
After exploring and discovering behind the walls and now separated from his old comrades, Eren, driven by this new truth, is now planning the “Earth Ruminations”: a terrifying project to wipe out everything that lives in this world. With the fate of the world hanging in the balance, a ragtag group of Eren's former comrades and enemies must try to stop him on his deadly mission. But can they succeed?