Yumeko Jabami, a second-year transfer student, arrives at Hyakkaou Academy and is introduced around the school by Class President Ryota Suzui. Ryota warns Yumeko that the wealthier students are likely to drag her into a gambling game to take her money. Later that day, Mary 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, Ryota 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.

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Yumeko is challenged to a game of Concentration by Itsuki Sumeragi, the daughter of a toy company CEO. Itsuki uses two decks of cards made by her father's company and wins 20 Million Yen from Yumeko in a close match. Yumeko demands a rematch to get it back and Itsuki accepts under the condition that she bets her fingernails and toenails. Itsuki deals from her two decks again, confident that her cheating style of using heat-activated patterns in the cards will help her win. However, Yumeko picks up on her scheme and wins on the first turn, remarking that Itsuki would have won if she used fresh cards. Afterwards, Kirari and her student council members gather with the objective of eliminating Yumeko. Yumeko finds herself invited to the club room of the Traditional Culture Research Society, just as Mary loses a high-stakes bet.

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Yuriko Nishinotouin, a member of the student council and president of the Culture Club, challenges Yumeko to the "Life or Death" game she just defeated Mary at. In this game, players bet on numbers on where swords in a cup will land, potentially winning or losing 30 times the amount they bet depending on how the swords land. After the first game ends in a draw, Yumeko goes all in, deducing that Yuriko has been cheating by having the dealer wear magnets on her hand to affect the movement of the swords. Just as Yuriko becomes panicked over the thought of potentially ...

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In leau of payment requests, both Yumeko and Mary receive "Life Schedules" from the student council, which dictate their entire lives including who they will marry if they do not clear their debts. Later, a boisterous male student named Jun Kiwatari attempts to force himself on Yumeko, but is turned away after beautician Midari Ikishima tries to rope him into a game of Russian roulette. Later, the student council announce a Debt Exchange Game, in which groups of four play a game two-card Indian poker to try and exchange their debts, with the winner losing their debt ...

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Jun is put under further pressure as Yumeko and Mary deduce he is using Nanami to cheat for him. With the game now becoming a battle of bluffs, Jun becomes desperate as he stands to obtain a large debt if he doesn't end up in first. Jun manages to move up to first but becomes panicked again when it looks like Nanami will overtake her and tries to coerce her into folding. After some provocation by Yumeko, however, Nanami rebels against Jun's orders. At the end of the match, Mary ends up in first place while Jun ends up in last, as it is revealed that they had switched ...

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Yumeko has still not paid her debt. The student council conclude Yumeko wants to challenge the student council president, Kirari. Mary is invited by Kirari to join the student council with the implication she is not allowed to refuse. Midari challenges Yumeko to a game to guess which cards are played by the dealer, and the winner gets to point one of two revolvers at the loser and pull the trigger with neither of them knowing which of the guns 6 chambers contain a bullet. Yumeko agrees but insists the game only last 3 rounds, Ryota must be the dealer, and the loser ...

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Seconds before Midari fires Yumeko reveals she sabotaged her gun, then immediately admits she is lying and the gun is unloaded. When questioned about her reasons Midari reveals she blinded her left eye as payment for losing against the president and now only gambles when the risk is pain or death. In the second round Yumeko correctly matches every card. She chooses a revolver and fires, having chosen the revolver that weighed less due to being unloaded. For the third round both Yumeko and Midari choose to load 2 bullets. Yumeko reveals Midari has been cheating by ...

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The president departs from the academy, leaving the rest of the council unsure how to deal with Yumeko. Council member Yumemi Yumemite, head of PR and a YouTube idol, announces she will be the next to challenge Yumeko. Itsuki Sumeragi, who, after losing to Yumeko, is in danger of being disowned by her father, offers to become loyal to Yumeko if Yumeko defeats the president, becomes the new president, and gives Sumeragi her place back on the council. Yumemi bets Yumeko 50 million on the outcome of an on stage idol championship competition and if Yumeko loses, Yumemi ...

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Yumeko and Yumemi play games designed to test idol skills, such as dancing and singing. Yumemi allows Yumeko to win several games so there appears to be a risk she will lose. For the 6th game they have to guess the birth month of members of the audience. Yumemi, having memorized the birthdays of her entire fan club, believes she can easily win, but the audience member chosen is Mary. Yumemi panics as she realizes Yumeko is able to manipulate dice and had rolled the dice to pick Mary specifically and easily wins the entire game. Yumemi allows Yumeko to play the ...

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Kaede becomes convinced Yumeko is simply a gambling addict he can easily beat. The masked vice president Ririka insists on dealing the cards for the match. The game is modified Poker where the last player to bet a chip can decide whether a stronger or weaker hand wins, no player is allowed to fold, meaning each round will have a definite winner. Yumeko bets her 310 million to buy 31 poker chips. Kaede bets 1 Billion and gets 100 chips. Yumeko wins the first round causing Kaede to factor in her love of risk taking. When Yumeko discards a strong hand Kaede responds by ...

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Kirari announces she will no longer support the other family heads. Yumeko and Kaede keep betting until Yumeko runs out of chips again, however, Sumeragi continues to buy her more chips until Kaede bets 100 chips to force her to stop from lack of money. Yumeko suggests Sumeragi bet her life, i.e. to receive a life schedule. Sumeragi refuses at first but after seeing Yumeko's cards she rips out her own fingernails and willingly bets her life. Based on Sumeragi's family wealth Ririka declares Sumeragi's life schedule to be worth 10 Billion. Kaede challenges the decision...

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Council member Runa Yomozuki acts as judge of their match. It is decided the loser of the match will be expelled. The game is Tarot, using 22 cards valued from 1 - 21 of which 3 will be chosen by Yumeko, Kirari and Ryouta. If a card is facing Yumeko she gains those points, but if it faces away from her she loses the points. If they pick the Fool card valued at Zero Yumeko wins instantly, but only if the Fool is facing her. If it is facing away she loses instantly. If the round ends and Yumeko has any points she wins, if she has less than zero points she loses.

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