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