Shingeki No Kiojin (attack on titan)

Shingeki No Kyojin is an action, tragedy and drama anime.
The story takes place in a world where the rest of the human population lives within a city surrounded by huge walls due to the sudden appearance of the Titans, giant humanoid creatures who devour humans apparently without reason. The story takes the focus Eren Jaeger and his foster sister Mikasa Ackerman, whose lives were forever changed after the appearance of a colossal titans that destroyed part of the city wall and several Titans came in, destroyed his home and devoured his mother.
Watch the trailer here:

This is the first opening:

Hope you like it. :3