قسمت 1: یومکو جابامی، دانش‌آموز سال دومی که به آکادمی هیاکاکائو منتقل شده، با چالش‌های قمار اولیه روبرو می‌شود.

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Yumeko Jabami, a second-year transfer student, arrives at Hyakkaou Academy and is introduced around the school by Class President Ryouta Suzui. Ryouta warns Yumeko that the wealthier students are likely to drag her into a gambling game to take her money. Later that day, Meari Saotome challenges Yumeko to a modified Jankenpon, where the class will drop cards with "rock" "paper" or "scissors" drawn on them, and the two players must win using only the first three cards they draw. After Yumeko appears to be blasted out of the pot, she offers a final bet worth 10 million yen in cash, and crushes Mary after revealing she figured out that she was manipulating the majority of their classmates' votes. In the hallway, Ryouta apologizes to Yumeko for his role in helping Mary cheat, and Yumeko offers him some of the winnings for adding to the thrill of the game. (Source: Wikipedia, edited)