Centuries ago, humanity faced near extinction at the hands of Titans—gigantic, seemingly mindless creatures that tower over buildings and consume humans not out of necessity, but seemingly for enjoyment. A fraction of the human population managed to survive by retreating into a city fortified by towering walls, higher than the tallest Titans. Fast forward to today, and the city has been free of Titan attacks for over a century. However, teenage Eren and his adoptive sister Mikasa witness a terrifying event when a Colossal Titan materializes and breaches the city walls. As smaller Titans pour into the city, the siblings are forced to watch in horror as their mother is devoured. Fueled by rage, Eren swears to annihilate every Titan and avenge humanity.