Unlike many schools, Hyakkaou Private Academy prepares its students for life in the real world. Because many of the pupils are children of the world's wealthiest individuals, the academy possesses quirks that set it apart from all others. During the day, it functions as a normal school, teaching subjects such as history and languages. However, at night, it transforms into a gambling den, instructing students in the art of handling money and manipulating people. Money equates to power; those who emerge victorious in the games rise to the top of the school hierarchy. Yumeko Jabami, a transfer student who appears naive and beautiful, is ready to attempt Hyakkaou's special curriculum. Unlike the others, she does not play to win, but for the thrill of the gamble, and her borderline insane approach to gambling might just introduce too many new variables to the table.