To protect themselves from the Titan threat, humanity built giant walls and lived in peace within them. Their 100 years of peace were destroyed by the attack of a Colossal Titan, and a boy who lost his mother, Eren Yeager, swore to eradicate the Titans and joined the Survey Corps.
Through a series of literal battles of life and death, Eren earned the power to become a Titan. As he contributes to humanity's victory, he slowly gets closer to learning about the truth of the world. The time passes, and Eren, who left the walls and parted ways with his friends at the Survey Corps, carries out a terrifying plan.
The "Rumbling," a plan in which one leads countless Titans to trample over the world and everything that exists upon it.
Mikasa, Armin, and everyone who was left behind are now taking on the final battle to stop Eren from destroying the world.