That day the human race remembered the terror of being dominated by them and the shame of being held captive in a birdcage Over 100 years ago a natural predator of humanity appeared titans giant humanoid but mindless monsters whose sole purpose of existence seemed to be to devour humans The survivors responded by constructing three concentric walls: Wall Maria, Wall Rose and Wall Sina However, one day a Colossal Titan far larger than any other seen before breached the outer wall.