I Inherited a Billion Netherworld Coins and Started a Business in the Mysterious World

The Mysterious World was originally a place where the great sages of antiquity imprisoned humanity’s sins. They believed that the world’s sins existed in a finite amount, and that if they were all confined to the Mysterious World, the human realm could enjoy lasting peace. As for humanity, everyone is forced to take part in a game on the day they turn eighteen, and afterward they are randomly drawn into further games. Some become powerful figures, while others become meals for the mysterious beings.