Rio is asked to train a new recruit named Anya Helsing to be a dealer. Anya is quick to point out that Rio owns a "Gate", one of thirteen rare cards that are wagered in battles with other "Gate Holders" to determine the strongest dealer in the world. Although her dealer skills are quite good, she is rather clumsy, causing some chaos in the casino. Meanwhile, a Gate Holder named Elvis comes to challenge Rio to a Gate Battle set on a giant roulette table. Although Elvis has confidence is his prediction of numbers, he ultimately loses to Rio when a bandage he was wearing on his finger comes off while throwing the ball, allowing Rio to guess correctly and win his gate.
ハワードリゾートに新人ディーラーのアーニャがやって来た。
アーニャの教育係を担当することになったリオの目の前で、アーニャは見事なカードさばきを披露する。
だが彼女は、常識外れなほどのドジっ子だった……。
一方その頃、リゾートのカジノに現れたのは、美女たちをはべらせたキザ男のエルビス。
彼は、世界で13枚しかないレアカード、“ゲート”の1枚を持つ“ゲートホルダー”で、おなじくゲートホルダーであるリオに、ゲートを賭けたゲートバトルを申し込む。
