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Yuriko Nishinotouin (西洞院 百合子)Rank: Student Council of Traditiom Culture Research Society. 

A third-year student, member of the student council, and president of the Traditional Culture Research Club. Yuriko is a calm, well-mannered yet manipulative character. Her true nature is that she dismisses those she deemed as not worthy of her time, and is utterly persuasive.

She is shown to be a poised and graceful lady. Though once provoked, she emits a dark expression and can get easily angered by simple goading, as shown by Yumeko during a gamble called 'Life and Death'. When proved otherwise, Yuriko's calm demeanor can quickly arise into a distressed and panicked state and will attempt to defend herself.

 She challenge Yumeko and won, but Yumeko knew that she was cheating.
(Source: Kakegurui wikia)