Reigning class gambling champion Mary attempts to hustle unsuspecting transfer student Yumeko Jabami into a high-stakes game of rock-paper-scissors.
Mary is relegated to the lowest levels of the gambling hierarchy after her loss. Student board member Itsuki challenges Yumeko to a game of pairs.
To regain her status, Mary duels student board member Yuriko in a game of "life or death." With Mary's crushing defeat, Yumeko offers to play next.
Yumeko and Mary square off against two others in a game of Indian poker after being given a chance to minimize their colossal gambling debts.
Kiwatari continues to lose as Yumeko and Mary bluff their way through the game, but the final outcome all comes down to Tsubomi.
Yumeko must face Beautification Committee Chair Midari in an ESP card game involving Russian roulette before playing the student board president.
Deeply engaged in their deadly ESP card game, Midari tells Yumeko about her heated match against student board president, Kirari.
In Kirari's absence, pop idol sensation Yumemi offers to play against Yumeko, asking her to wager total control of her life.
With her pop idol career on the line, an enraged Yumemi seeks to ruin Yumeko after a scandalous voice recording is used as a bargaining chip.
Yumeko's odds are stacked against her when she challenges the well-funded student board treasurer, Manyuda, in an original game of poker.
Itsuki, no longer wanting to be under Manyuda's control, offers to bankroll 100 chips after Yumeko goes all-in and loses on the previous hand.
Yumeko and student board president Kirari both wager self-expulsion from the academy as Ryota becomes the key to the final outcome of their game.
Mushibami heiress Erimi challenges Yumeko and Midari to a cruel game of chicken featuring a sadistic finger-slicing contraption.
The Momobami clan is thrown into disarray when Kirari proclaims that the winner of the election will also take over as leader of their family.
With election committee chair Runa Yomotsuki presiding, former Vice President Ririka pits Momobami clan members Miyo and Miri against an eager Yumeko.
Mary, playing in place of a poisoned Yumeko, orders Ryota to show his cards, but a confident Miyo tries to convince him to keep his cards to himself.
To gain more chips and popularity, Yumemi ropes Yumeko into forming an idol unit with her, but the entry of a true Hollywood star raises the stakes.
Outperformed and outwitted by Kawaru Natari in the first round, Yumemi goes all-in for the second round, only to end up broken and vulnerable.
With Kirari rapidly amassing votes, Yumeko and other top-ranking players gamble amongst themselves to either boost their chip count, or lose it all.
Accused of betrayal, Yumeko threatens to throw the whole game -- but is she bluffing? To test Manyuda and herself, Itsuki takes a major risk.
Livid at Yumeko, Sayaka challenges her to a game putting “everything” on the line: no chips, no election ranking, just everything they each hold dear.
Inside the Tower of Doors, Sayaka uses logic to advance ahead, while Yumeko’s curiosity and love of gambling inspires her to take an alternate route.
When a select group of contenders are invited to bid in a "100 Chip Auction," Yumeko changes the game rules by offering the unimaginable.
A vengeful Rei declares she will win the election and take over both the school and the clan itself, but Yumeko stands in her way.