良家子女聚集的名门学校，私立百花王学园。君临这所被赌博所支配的学园顶点的是，支配弱者的人生、甚至对政界财界都拥有影响力的绝对支配者，学生会。然而，学生会长桃喰绮罗莉，突然宣言了学生会的解散及总选举。
选举的规则是一人一票。全体学生都被给予了登上学园顶点的机会。这是追求混沌与愉悦的绮罗莉一念之下带来的选举战。不止如此，与此同时新的威胁也随之而来。那就是，百喰一族——绮罗莉与梦子也位列其中的人们。蛇喰梦子以及与她有着深厚友情的铃井凉太、早乙女芽亚里、皇伊月这4人，在这次策划的总选举中，即将展开赌上各自信念的战斗。
是在弱肉强食的学园中成为“饵食”，还是吃掉其他人成为生态系的“捕食者”。千钧一发的选择会使得内心无比动摇的“究极选举死斗”就此开始！

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!