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Born into an ordinary family, Mary Saotome (Aoi Morikawa) is thrilled on her first day transferring to Hyakkaou Private Academy. This is no ordinary school—it's a prestigious institution attended by the children of political and business elites, where Mary's dream of living a refined, elegant life is about to begin. Welcomed warmly by her new classmates in Hana Class 1, Mary feels optimistic . However, the class's central figure, Kokoro Aiura (Riko Fukumoto), invites her to participate in something unexpected: gambling. At this academy, academic or athletic achievements mean nothing—gambling prowess reigns supreme. Mary's first taste of gambling in a game called "Speed President" ends in a crushing defeat . Though she initially tries to escape, an encounter with her former classmate, Tsuzura Hanatemari (Shiori Akita), sparks a new resolve. Thus begins Mary Saotome's journey down the path of gambling.