 Fortunately, Kaiji comes across Kōtarō Sakazaki, a man who tells him of a pachinko game known as the Bog in a high-stakes casino where Kaiji can win over 500 million yen.Kaiji agrees to help him beat the Bog.However, the casino is owned by Teiai, and the Bog has been rigged in several ways by the manager of the casino, Seiya Ichijō, and his men to ensure that it won't pay out.