Okay so basically its about The sexy guy named Eren Jaegar who lives in our world but its completely different now. A new species has been introduced to the Earth. They are called Titans or Giant Naked stupid people. They hunt and Eat humans.
So walls have been bulit 100 years ago (about when the titans first came in.) Nothing has happened for 100 years and people believe they are safe from Titans. Then the wall fails and the titans invade the first wall. Eren loses something important to him that day. (Not telling you what.) So he joins the Millitary (to fight Titans).
ERGG I'm bad at summaries. Here watch this trailer.
Several hundred years ago, humans were nearly exterminated by titans. Titans are typically several stories tall, seem to have no intelligence, devour human beings and, worst of all, seem to do it for the pleasure rather than as a food source. A small percentage of humanity survived by walling themselves in a city protected by extremely high walls, even taller than the biggest of titans.
Flash forward to the present and the city has not seen a titan in over 100 years. Teenage boy Eren and his foster sister Mikasa witness something horrific as the city walls are destroyed by a colossal titan that appears out of thin air. As the smaller titans flood the city, the two kids watch in horror as their mother is eaten alive. Eren vows that he will murder every single titan and take revenge for all of mankind.