Attack on Titan (manga)

Attack on Titan is an anime about humanity's struggle against Titans, man eating giants. A little over 100 years ago, the titans appeared, and pushed humanity to the brink of extinction. Humanity built a single stronghold with mighty walls the titans couldn't breach. Shortly after the story begins, a colossal titan appears, and destroys an outer wall. It is known for Anyone Can Die, so don't get to attached to anyone.