Attack On Titan

Imagine a world where giant humanoid Titans to catch and kill people. So exactly in this world is a boy named Eren joins the scouting legion to get revenge on the beasts who killed everyone in his hometown. One hundred years ago on Earth mysteriously and very quickly discovered the Titans and decimated most of humanity. The survivors built a huge wall and humanity was given to the good of the next hundred years. Therefore, until now, when the wall was breached and a new bloody rampage is just beginning...