Yuriko Nishinotouin, a third-year Hyakkaou Private Academy student, leads the Traditional Culture Research Club and previously served on the Student Council. Her long brown hair, tied with a vibrant red bow, complements her signature white-and-red floral kimono—a deliberate rejection of the standard uniform, signaling her commitment to tradition. Though her eyes remain typically closed, they reveal brown hues on rare occasions. Maintaining an aura of poised elegance, Yuriko cloaks her cunning behind polished manners, luring rivals into her rigged gambling spectacle, *Life and Death*. Participants bet on numbered swords drawn from a cup, unaware of her subtle cheats. While unflappable in most scenarios, insults or challenges—particularly from adversaries like Yumeko Jabami, who exposed her deceit—pierce her composure, igniting quiet fury. Unpredictable disruptions fray her control, prompting frantic negotiations or appeals to alliances to evade defeat. Born into a noble Heian-era lineage, her family’s clout secured her Student Council seat, a position she wielded to shield her club from the academy’s merciless hierarchy, where defeated students face "livestock" subjugation. This duty compelled her to join high-stakes gambles during the council elections, though setbacks like Midari Ikishima’s Rock Paper Scissors Poker victory and poisoning by Miyo Inbami and Miri Yobami eroded her influence. In *Kakegurui Twin*, set a year prior, her club’s festival game garners acclaim while the Ougatou twins threaten her council standing. *Kakegurui Midari* delves into her mastery of antiquities, showcasing her gamble with Midari to protect a historically significant teabowl—a testament to her cultural reverence. Yuriko’s arc balances her cultivated refinement against hidden fragility. Though meticulous in strategy, opponents who unravel her schemes force desperate measures. A fleeting alliance with Midari during Rei Batsubami’s election auction underscores her pragmatism. Despite humiliations and near-downfalls, her actions remain anchored in preserving her club and heritage, even at personal cost.