After 4 years, Eren Jaeger has to live a life alone. The 19-year-old-art-boy has experienced the bitter truth when he had to see his parents dead right in front of his eyes. During that time, Mikasa Ackerman, helped Eren to live a life full of suffering. Mikasa is also able to make Eren to forget the trauma weighs. However, everything changed when Eren meets his childhood friend who has disappeared for a long time. At that moment, Annie Leonhart, reappearing right in front of him, carrying a ton of memories that had been buried deep in Eren's memory. Feeling being lied to, Eren vows to assume she never returns. Nevertheless, Annie's arrival is not to meet him. Annie keeps a secret that no one else knows. She has a huge task to keep the world from destruction.