After a hundred years of safety, a colossal-sized Titan smashes through the defenses, unleashing a flood of giants and carnage in the streets. When the man-eating giants called Titans first appeared, humans retreated behind massive walls. Eren Jaeger watches helplessly as one of the creatures devours his mother.

From the manufacturer "An intense, visceral, and graphic thrill ride" – Anime News Network “The most intense anime of 2013” – TheDailyDot “Japan’s equivalent of The Walking Dead” – io9