One night, a tragedy, that lead her to prison. After spending many years in that Hell, Ro is freed. She was offered to train in the Roxwell Academy because of her exigent skills, a chance for her to know the truth behind her friend's death. However, things turned around for her. She soon learns the truth, that she's the killer of that night tragedy, causing chaos within the academy. And that she's from seven thousand years ago, carrying a heavy mission in her hands. Not only her, but with the seven others.