The last remnants of humanity were forced to retreat behind the towering walls of a fortified city to escape the massive, man-eating Titans that roamed the land outside their fortress. But one day, the walls were breached. 10 months after the attack of the Titans, troops assembled to fight the Titans have been training daily. The people earnestly wish for the walls which were destroyed by the Titans to be repaired. In order to do this, the government has been covering the research expenses for the development of weapons against the Titans with precious tax money. Hange, the weapons leader, spends her time on independent Titan research for the purpose of finding the vulnerabilities of the Titans, which are many times bigger than humans. Many of the troops have lost their homes and families because of the emergence of the Titans. They vow to have a heroic counterattack on the Titans.