Several hundred years ago, humans were nearly exterminated by Titans. Titans are typically several stories tall, seem to have no intelligence, devour human beings and, worst of all, seem to do it for the pleasure rather than as a food source. A small percentage of humanity survived by walling themselves in a city protected by extremely high walls, even taller than the biggest Titans. Flash forward to the present and the city has not seen a Titan in over 100 years. Teenage boy Eren and his foster sister Mikasa witness something horrific as the city walls are destroyed by a Colossal Titan that appears out of thin air. As the smaller Titans flood the city, the two kids watch in horror as their mother is eaten alive. Eren vows that he will murder every single Titan and take revenge for all of mankind. Nominated for the 4th Manga Taisho Awards (2011) and won the Kodansha Manga Award shōnen category (2011). In English, the series is roughly translated to 'Attack on Titan'.
The former monarchy has been forfeited and the officials arrested, but Erwin Smith and Darius Zackly still have doubts about their newly appointed positions. They discuss the direction humanity will take after their drastic actions and contemplate the penalty it will ensue. Hange and the new Levi squad attempt to locate Eren after he was taken to a dungeon by Rod Reiss and Kenny Ackerman, with Historia Reiss as a front. Chained up and confused, Eren is confronted by Historia and she reveals that Lod is not an enemy of humanity. Lod and Historia say that all will be explained soon enough. Hidden powers trigger a distant memory of Eren with his father, and the aftermath of his very first transformation is revealed.
While soldiers continue to die in order to protect Eren, Jean attempts to take the 3D Maneuver Gear of a dead soldier in order to escape. Marco arrives to assist him, soon followed by Annie and Connie and together, they manage to evade the Titans and escape to the top of the wall. That is when Eren finally picks up the boulder and heads towards the hole, followed by the soldiers determined to die. Eventually, the hole is plugged up and Mikasa, Armin and Rico Brzenska find themselves protecting Eren against a horde of Titans, until Levi arrives to slay them. After the operation, soldiers have to gather the corpses and it is revealed that Marco is one of them, much to Jean's shock. Some time later, Eren wakes up in a cell and after expressing his desire to kill Titans, Levi decides to take care of him as his Captain of Survey Corps.