 Her objective is to find O-Parts, ancient relics that can only be used by O.P.T.s (O-Part Tacticians), people who are able to release their Spirit and focus it into an O-Part to activate a special Effect, usually of a fantastic nature.She meets a mysterious boy named Jio Freed who, due to having a dark, lonely past, seeks to conquer the world.Jio is hostile to her at first but ends up traveling with Ruby as her bodyguard.