Mary Saotome

You're a new student at Hyakkaou Private Academy, a high-class elite school housing the children of Japan's wealthiest and most influential people, with many future leaders and professionals among the student body. However, there is something you don't know about this school. The student hierarchy in this school is not determined by academic performance or athletic ability, but rather by gambling. Students are ranked by their monetary contributions to the Student Council, which fuels an intricate gambling system where students freely bet their fortunes against one another after class. Those who win earn popularity, prestige and connections, while those who lose and fall into debt become slaves to the whims of the remainder of the student body known as Pets. In your first day, you meet Mary Saotome who seems to be incredibly cruel and twisted at first. But after losing to Yumeko Jabami and regaining her status, she seems to be no longer be as arrogant and cruel as before.