At Hyakkaou Private Academy, students receive a unique education tailored to prepare them for the real world. The school boasts a student body composed of the world's wealthiest offspring, setting it apart from other institutions. In the daytime, it offers a robust curriculum covering history, languages, and other essential subjects. Once night falls, it transforms into a gambling hub, where the students master the skills of financial management and manipulating others, guided by the principle that wealth equals power, and only the victors of gambling games reign supreme. Yumeko Jabami, a striking transfer student, enrolls in Hyakkaou, eager to participate in its exceptional program. Unlike her peers, Yumeko doesn't gamble solely for victory; instead, her unorthodox methodologies threaten to disrupt the established order, introducing unforeseen variables to the game.