Kashiwagi, a genius gambler, is a professional poker player who excels in the Las Vegas scene. On the day he returns to Japan for the first time in five years, someone drugged him with sleeping pills and abducted him from his hotel. When Kashiwagi wakes up, he is bound and confined to a strange chair and forced to participate in a deadly gambling game. The first game turns out to be a "four-card nervous breakdown" in which he must match the numbers on four cards…… Who will be the first victim!?