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Hyakkaou Private Academy, a prestigious private school. Here in this academy, students are divided into social strata. Standing above all others is the student council, who rules over the students with their Gambles. It's heaven if you win, and hell if you lose. Those adept at gambling are the envy of all, while the weak are left to suffer the madness of the academy. One girl transfers to this academy. Her name is Jyabami Yumeko.
Hyakkaou Private Academy. An institution for the privileged with a very peculiar curriculum. You see, when you're the sons and daughters of the wealthiest of the wealthy, it's not athletic prowess or book smarts that keep you ahead. It's reading your opponent, the art of the deal. What better way to hone those skills than with a rigorous curriculum of gambling? At Hyakkaou Private Academy, the winners live like kings, and the losers are put through the wringer. But when Yumeko Jabami enrolls, she's gonna teach these kids what a high roller really looks like!
Himoto Sora is a transfer student with a sense of justice and dreams of becoming a knight. Upon arriving at Utopia Gakuen, she learns of a virtual reality-like game played by the male students in which they use girls as weapons in battles for status and treat them as commodities. Seeing one of these girls being abused she steps in and through some sort of error unwittingly becomes the first female participant of the game.