Hyakkaou Private Academy, unlike many other schools, prepares students for life after graduation. Because many of the students are the children of the world's wealthiest people, the school has its unique quirks that distinguish it different from the others. Throughout the day, it is a conventional school, teaching history, languages, and other subjects. At night, however, it is transformed into a gambling den where kids are taught how to deal with money and influence others. Money is power, and the winners of the games climb to the top of the school. Yumeko Jabami, a naïve and charming transfer student, is ready to put Hyakkaou's innovative curriculum to the test. She differs from the others in that she does not pander to the crowd.