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In this story, we’re treated to a twisted, gothic-horror remix of the classic Cinderella story as re-imagined by a shounen author for a shoujo audience, where we find, in the end, that nothing comes free, and if it sounds too good to be true, well, there’s usually a catch. (You’ve never seen Cinderella like this!)
Growing murder rates have forced the Japanese government to resurrect a Meiji-era penal code called "Death by Retaliation," allowing criminals to be executed in the same way their victims were killed. Within a special police task force, nine Assistors—executioners who are also victims of crimes—carry out these retributions with fervor and sincerity.
In the not too distant future, mankind battles over O-Parts, relics from an ancient civilization. It takes a special kind of person to unlock the full potential of these remnants from the past, and a unique breed of humans known as O.P.T.s (or O-Parts Tacticians) become a force to be reckoned with. Unfortunately, O-Parts can be used for good or evil purposes. Jio is a young boy with a tragic past who only trusts one thing in the world: money. Little does he suspect that he is actually a very powerful O.P.T., and inside him sleeps a demon of incredible ferocity. He meets up with a girl named Ruby, and together they decide to embark on a dangerous quest to discover as many O-Parts as they can. Will Jio help Ruby realize her dream of becoming a world famous treasure hunter? More importantly, will Ruby help Jio realize his dream of--world domination?!