The battle at Wall Maria is over for now, and the remaining scouts finally make it to Eren's family basement, where they find journals left behind by Eren's father. These journals lead us into a rewind to Eren's father's childhood where we see him growing up in a city where people like him are sectioned off and treated as less than human. We see his upbringing and his attempt to fight against those oppressing his people, only to be betrayed by someone he never expected.