Hyakkaou Private Academy is home to sons and daughters of some of the wealthiest and most powerful families in the world. In regular schools, students learn math, science, literature, and physical education, but enrollment at Hyakkaou Private Academy teaches lessons through gambling, where money and even people’s futures are put on the line in games to teach these wealthy heirs the art of strategy and deception. Among the most talented and strange is one Yumeko Jabami who doesn’t simply play for money but for the thrill of the game.

Imagine for a moment, all is dark and then, suddenly, you find yourself stepping out of an elevator into a bar and lounge area where you are greeted by a bartender. He introduces himself as Decim, arbiter of Quindecim, the room you now stand in. You will be sent to compete in a death-defying challenge to save your own life but unbeknownst to you, you and your competitor, another person, are both already dead. What you are fighting for is not your life but your soul, teetering between the realm of reincarnation and total oblivion. This is the challenge all souls must face when they die.