Several hundred years ago,humans were nearly exterminated by giants. A small percentage of humanity survived in a city protected by high walls.Eren and Mikasa witness something horrific as the city walls are destroyed by a super giant. As the giants flood the city, they watch in horror as their mother is eaten alive. Eren vows that he will murder every giant and take revenge for all of mankind.
Season 2 realease date confirmed for 2nd half of 2016
It is speculated by fans that "Attack on Titan" season 2 may release any time between July and Septemberof this year. This is because the current manga series is just two arcs ahead of the anime and it may take the first half of the year to finish the required four-arc lead.
According to Tetsuro Araki (Creator of Attack on Titan Series) it is sure that the show will premiere within this year.
There are speculations that season 2 could probably be the end of the anime series adaptation since the first season already covered 34 chapters and four story arcs of the printed version. Since the series is already 60 percent finished with the manga, this leaves 27 volumes left to work on.