Yuriko Nishinotouin, a third-year Hyakkaou Private Academy student, commands the Traditional Culture Club while balancing her tenure as a former Student Council member. Her presence radiates elegance, draped in a white-and-red floral-patterned kimono, a vivid red bow securing her long brown hair. Though her eyes remain delicately closed, rare glimpses reveal warm brown irises. At 163 cm, her traditional attire starkly contrasts with the modern uniforms of peers, embodying her unwavering reverence for Japanese heritage. Beneath her poised exterior lies a strategic mind adept at psychological manipulation. She orchestrates "Life and Death," a seemingly benign gambling game concealing calculated deceptions like magnetic interference by dealers. While her methods secure dominance, they crumble under acute scrutiny, exposing vulnerabilities. Publicly unflappable, private turmoil surfaces when unpredictability threatens her control, driving her to broker deals or exploit alliances to shield her authority. Descended from a Heian-kyo noble lineage, Yuriko’s council seat was purchased through familial wealth rather than merit, a pragmatic choice to shield her cherished club from the academy’s ruthless hierarchy. Members revere her for genuine loyalty, as she tirelessly guards them from the dreaded "housepet" fate, prioritizing their safety over personal ambition. Her resolve is tested in pivotal confrontations. After narrowly defeating Mary Saotome, Yumeko Jabami unravels her deceit in "Life and Death," leaving Yuriko clinging to victory by chance—a humiliation that fractures her confidence, prompting withdrawal from council duties. During the presidential election, a reluctant pact with Midari Ikishima to thwart Rei Batsubami backfires when Midari defeats her in Rock Paper Scissors Poker. Subsequent poisoning by Miyo Inbami and Miri Yobami lands her hospitalized, underscoring her fragility beneath the regal facade. Spin-offs delve into her past: *Kakegurui Twin* reveals her early council days, where the Traditional Culture Club’s festival game earns acclaim, while the Ougatou twins menace her position. In *Kakegurui Midari*, she risks everything to preserve a historic tea bowl, battling Midari in a gamble that mirrors her devotion to cultural legacy over self-preservation. Yuriko’s narrative weaves moral duality—cheating to uphold tradition, allying with rivals like Midari despite disdain, and challenging Kirari Momobami to protect the academy’s eroding order. Each choice underscores her conflicted ethos: a guardian of heritage navigating a world where survival demands compromise.