Life within the walls always seem normal, safe and protected from what roams beyond it. What lives behind the walls are people classified as Seekers, Scholars and Origins decided by taking a series of test and challenges when the kids turn 13 years old. Except for Astraea Sinclaire, a prodigy in all but she's destined to be an Origin. Determined, she decides to learn her way to be something more with the help of her two closest companions Daria and Xienna, but what lies within these walls are not always what it seems.