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Kaiji and Kazuya face off against each other in a high-stakes game of "One Poker," a modified version of standard poker.
One day, when Hidaka Kishi is going to school with his close friend Kimiko, he notices a strange new song on his music player: "Who Killed Cock Robin?" Little does he know, a murderous game is beginning, with him as the target--the Cock Robin. Fourteen other players (called 'birds') are all competing to kill him, in exchange for making their wishes come true. However, one of the birds, Saedano Minami, seems to have other plans. To Hidaka's confusion, she decides to protect him, but what is her ultimate goal? How will Hidaka survive this deadly game?
Itou Kaiji is as pathetic a person as they come; a man who gambles his days away, only winning enough to lose significantly more. He hates himself, is riddled with envy for others, but is ultimately too weak to think of a way out of his massive debts. Then one day he is approached by a strange man who offers him what seems the solution of a lifetime – to take a short journey on a ship called Espoir, during which time he will be given the chance to win more cash than he can dream of in a card game like no other. Ever the desperate, Kaiji takes the gamble of his life; however, the game turns out to be far darker than he expected and the hard lessons pile on thick and fast. Now stuck in a closed world of unsavory characters willing to do anything to destroy him, can Kaiji gather enough courage to outwit them all?
After Kaiji's showdown with Chairman Hyoudo at Starside Hotel Kaiji is forced into labor at an underground mine. With meager wages each day, he will work for decades unless he doesn't do something. Now Kaiji must wager his earnings in underground Chinchirorin gambles for a ticket to the rest of the world. But even if he surfaces, he only has one chance to pay back his enormous debt, and that is by challenging the "unbeatable" Pachinko machine, The Bog.
The overwhelming victory against the 'Bog' has been like a dream. Itou Kaiji, now free of debt but without a penny is leeching himself in Mr.Sakazaki's new house, despite all the flirtings (extreme torment for Kaiji) from Sakazaki's daughter, Mikoko. Sakazaki attempts to kick Kaiji out, even by offering a farewell 'we never knew each other' money of 3 000 000 yen. While Kaiji ponders himself on the decision, he is visited by Miyoshi and Maeda, two of his 'allies' he had saved from the last part of the series.
There are gamblers out there who even bet their lives as ante. But to secure the integrity of these life-threatening gambles, a violent and powerful organization by the name of “Kagerou” referees these games as a neutral party. Follow Baku Madarame a.k.a. Usogui (The Lie Eater) as he gambles against maniacal opponents at games – such as Escape the Abandoned Building, Old Maid, and Hangman...
Alice Ryouhei, now a grown adult and married to Yuzuha, who is expected to give birth to their first child any day now, suddenly finds himself back in the Borderlands, the land between Life and Death, after getting into an accident. Will he be able to make it out of the Borderlands once more...?