Winning is not what draws Yumeko Jabami to the gambling table. The seemingly naive transfer student craves the thrill of taking a chance, making her an unpredictable addition to Hyakkaou Private Academy, where success at games determines a student's standing.
Many of Hyakkaou's pupils come from extraordinarily wealthy families. Their conventional daytime lessons in subjects such as history and languages give way at night to gambling, with money management and the manipulation of others becoming part of their education. Money confers power, and the most successful players occupy the top of the school's hierarchy. Yumeko is eager to take part, but her reckless approach sets her apart from students focused on winning—and could disrupt the order their games sustain.