Attack on Titan is set in a world where the remnants of human civilization lives in cities surrounded by gigantic walls to protect them from the Titans, a race of giants who feed on humans for seemingly no cause or reason. Eren Jaeger and his adopted sister Mikasa Ackerman are two inhabitants whom’s lives are dramatically changed when the colossal walls, which have stood unbroken for 100 years are suddenly brought down by a titan larger than any seen before. Eren swears to destroy the monsters who have forced humanity to live in cage of their own creation.