"Kakegurui" is set in Hyakkaou Private Academy, an elite school where students are groomed to become future leaders of society. However, the institution operates under a unique hierarchy determined by gambling. Wealth and status are secondary to gambling prowess, as students engage in high-stakes games to climb the social ladder. Those who lose accumulate crippling debts, becoming "house pets" who are subjected to humiliation and servitude.

The narrative centers on Yumeko Jabami, a transfer student who quickly disrupts the school's established order. Yumeko is a compulsive gambler with an unorthodox approach to games, driven not by greed or ambition but by the thrill of risk itself. Her arrival challenges the dominance of the Student Council, a group of elite gamblers who enforce the school's rules and maintain their power through manipulation and intimidation. The council is led by Kirari Momobami, the enigmatic and ruthless president, who oversees the gambling system with a detached, almost whimsical demeanor.

As Yumeko navigates the school's cutthroat environment, she encounters various opponents, each with their own specialties and psychological tactics. Among them is Mary Saotome, a cunning and ambitious student who initially views Yumeko as a rival but later becomes an uneasy ally. Ryota Suzui, a former house pet, serves as Yumeko's guide and confidant, providing insight into the school's dynamics. Other notable characters include Midari Ikishima, a deranged gambler obsessed with self-destruction, and Yuriko Nishinotouin, a calculating strategist who values logic above all else.

The series explores themes of power, manipulation, and the psychology of gambling, with each game serving as a battle of wits and wills. Yumeko's unpredictable nature and willingness to embrace chaos often give her an edge, but her opponents are equally resourceful, leading to intense and unpredictable confrontations. The stakes escalate as Yumeko's actions draw the attention of the Student Council, culminating in a series of high-stakes gambles that test her limits and challenge the school's oppressive system.

"Kakegurui" blends psychological drama with high-stakes gambling, creating a tense and engaging narrative. The characters' motivations and strategies are central to the story, with each game revealing new layers of their personalities and the school's dark underbelly. The series maintains a focus on the interplay between risk, reward, and human nature, making it a compelling exploration of the extremes to which individuals will go for power and survival.