Cleo goes into hiding after a mysterious death at Yasiro Academy, and she and her friends set out to uncover the spy who must be working within the school´s ranks. Meanwhile, Xaius Octavian continues his assault on the galaxy as his complicated origin story, and how he went from being Cleo´s best friend to a ruthless dictator, is revealed. In the end, a space battle and dramatic confrontation between Cleo and Octavian will change both of their lives forever.