Two men have just arrived at a place called Quindecim and cannot recall how they got there. A young woman immediately greets them and leads them to a small bar, where a bartender is waiting. They are informed that they must take part in a game selected at random by roulette and will not be allowed to leave until it is finished; refusing would result in dire consequences. Along with the game's rules, the two men are told to play as though their lives depend on it. The selected game is billiards. However, it involves more than just pocketing pool balls, as the two are about to discover that the outcome could mean life or death.