Twenty-nine-year-old Reina Amatsuki thought she was ordinary until a supernatural creature called a Hollow bows before her instead of killing her. Taken into the custody of the secretive Astral Order, Reina meets Ren Kurose, a deadly Starborn Hunter assigned to protect her… and execute her should she become a threat. All because something ancient is awakening inside Reina. Later she learns that she's connected to Aurelia, the lost Seventh Starborn and embodiment of Possibility, blamed for destroying the other six Starborn over a 1000 years ago. But as forgotten memories begin returning, Reina discovers history may be wrong. The Starborn were once a family. Aurelia may not have betrayed them. And something far worse than the Starborn is returning. As people and even entire futures begin disappearing, Reina must uncover what happened 13 centuries ago before she loses herself to Aurelia, while Ren is forced to fulfill his orders, and Possibility itself is erased from existence.