Reika used to like games... until her body became the playing field.

Yukio Mimura came from a wealthy HouseHold and never wanted for anything. Kind and gentle, he obediently fulfills his dying father's final request: find a previously unknown cousin and allow him to live in the HouseHold mansion. But his cousin Hayato has other ideas for the HouseHold's mansion, its fortune, and especially Yukio's girlfriend Reika?

Woefully unaware of his HouseHold's sadomasochistic history, Yukio is d to agree to a sexual competition to avoid the exposure of the HouseHold's dark secrets. A competition where Reika has become the playing field: the first to break her sexually is the one who gets both the mansion and the money.

Caught in the middle of a bizarre ritual between her current boyfriend and his sadistic cousin, it is Reika who will ultimately decide the winner of this twisted competition: the one who can take her to the extremes of ecstasy, or the one who loves her.