Several hundred years ago, humans were nearly exterminated by giants. Giants 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 giants.
Flash forward to the present and the city has not seen a giant in over 100 years. Teenage boy Elen and his foster sister Mikasa witness something horrific as the city walls are destroyed by a super giant that appears out of thin air. As the smaller giants flood the city, the two kids watch in horror as their mother is eaten alive. Eren vows that he will murder every single giant and take revenge for all of mankind.
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The Hunters 02x08
Close Combat 02x07
I'm Home 02x02
The source of the Titan's strength is revealed.
Beast Titan 02x01
Coupled with the military's coverup of a previous incident, the shocking discovery inside the wall causes a stir. Elsewhere, while the new scout recruits are held for observation, a surprising threat appears.
OVA 1 (Episode 3.5) 01x26