While mahjong is a game that is often played with family and friends, it is also a game that is played in the darkest corners of society. Nangou is a compulsive gambler who has accumulated debt over three million yen. In a last ditch attempt to clear his record, he decides to wager his life on a game of mahjong with the mafia. Unfortunately, as the game progresses, Nangou only moves further from the prize and closer to death.
When all hope seems lost, the game parlor is suddenly intruded upon by Shigeru Akagi, a young boy on the run from the police. Desperate to turn the game around, Nangou hands the game over to Akagi after teaching him a few of the rules. The mafia can only smirk as Akagi sits down to play. However, they soon come to learn that Akagi is a natural born gambler. An imposing figure who does not fear death. One who is destined to become a legend.
[Written by MAL Rewrite]

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 3000000 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.

No matter how much time passes, and no matter who they are, the love one has for their parents does not change. A heartbreaking tragedy about the memories a son has of his late father.

The continuation of the Kaiji series, picking up immediately after the end of One Poker Hen.

Spoiler (mouse over to view)One Poker has been concluded, with Kaiji emerging as the victor and claiming the 2.4 Billion Yen as a prize! But now, a new problem arises... how can the Asian Trio take it with them with Kazuya's Black Suits gathered right outside the entrance of the warehouse?!

The 6th part of the Kaiji series.

1. Tobaku Mokushiroku Kaiji

2. Tobaku Hakairoku Kaiji

3. Tobaku Datenroku Kaiji

4. Tobaku Datenroku Kaiji - Kazuya Hen

5. Tobaku Datenroku Kaiji - One Poker Hen

6. Tobaku Datenroku Kaiji - 24oku Dasshutsu Hen

After awakening from an eight-year-long coma, Kurosawa must face the trials of homelessness.

Ukai Rei saves three troubled teens from a Suicide Website, and together they choose to work as modern-day 'Robin Hoods' of society. However, Rei's friends are caught by an underworld gang whose heist the group had foiled. In order to rescue them, Rei is forced to enter a gambling competition hosted by a rich, rotten old man who is looking for a talented gambler to be his rep player in an upcoming gambling tournament for millionaires from all over the world. The reward money? ONE TRILLION YEN.

Note - This story is directly continued in its sequel.

This is part 2 of Gambling Emperor Legend Zero, picking up a few years after the cliffhanger ending of part 1.

One incredibly tough kid tries to clear his name. He’s no murderer, and he’ll do whatever it takes to prove it…

From Kotonoha:
Takeda is diagnosed with cancer and feels that he has nothing to live for. His wife also had had cancer, had died of it in fact, and his only daughter has been missing for fourteen years.

One day, when he is about to attempt suicide, the phone rings. It’s the police, and they inform him that the dead body of his long lost daughter has been found, that it appears to have been a homicide. Takeda is crushed but resolves then and there to spend the remaining days of his life hunting down his daughter’s killer.

The time left for Takeda to live equals the time left to put the murderer behind bars. Life is a heart-wrenching story about a father’s willpower and his search for the truth.

In the aftermath of the disclosure game that won two Mahjong anomalies, the villainy "17 steps" game. Kazuya sets forth a gamble of 1,200,000,000! How will Kaiji survive?!

One shot collection of Fukumoto Nobuyuki.

Set in 2002, 3 years after the death of Akagi Shigeru, this sequel to Ten - Tenna Toori no Kaidanji chronicles Hiroyuki's quest to follow the late Akagi's advice and live life freely even if it means complete failure.

A collection of short mahjong-centric stories by Fukumoto Nobuyuki.

Katagiri Yuuji is a divorced, single, lazy gambling addict whose only real activity is playing Pachinko. He does it well enough to get by, but his life is more or less empty... until a young girl named Miura Satomi appears, who is a big fan of his. A classic story by Fukumoto about Pachinko, attraction, and the thrill of gambling.
(Source: MU)

Japan, 1995. After graduating from high school, Itō Kaiji moves to Tokyo to get a job, but he fails to find steady employment because the country is mired in its first recession since World War II. Depressed, he festers in his apartment, biding the time with cheap pranks, gambles, liquor and cigarettes. Kaiji is always thinking about money and his perpetual poverty frequently brings him to tears.

Kaiji's unrelenting misery continues for two years until he is paid an unexpected visit from a man named Endō, who wants to collect an outstanding debt owed to him in Kaiji's name. Endō gives Kaiji two options - either spend ten years to repay this outstanding debt, or board the gambling ship Espoir ("hope" in French) for one night to clear the debt. Using a con, Endō pressures Kaiji into accepting the deal, believing he will never come back from the voyage.
--Wikipedia

The manga is divided into three parts:
Part 1: Volume 1-13 (Complete)
Part 2: Volume 14-26 (Complete)
Part 3: Volume 27-39 (Complete)
Part 4: Volume 40-? (Ongoing)

Morita Tetsuo's life changes when he meets Hirai Ginji, who works in the unknown and mysterious 'back world' of society full of villains.

Tenma is a Middle Schooler who loves playing Mahjong. He doesn't know exactly why, but the freedom it brings him fills his chest with pride. One day, his friends run into some trouble with University Students from Kantou, and it's up to Tenma to save the day!

Itou Kaiji is a bum who steals car emblems and slashes tires on what seems to be a regular basis. This routine changes one day when he is paid a visit by a man in a trench-coat. Once the two get talking, it seems that the visitor (Calling himself Endou) is a debt collector. The reason for his visit is an unpaid loan which kaiji had previously co-signed for a work-mate (Furuhata Takeshi). The original loan was 30000 yen and once Takeshi had disappeared, the loan then fell on Kaiji.
Kaiji is then told of a way to clear the interest compounded debt (which stood at 3,850,000 yen), which involved getting on a boat with others in his position. Once on the boat the debtors would then have to gamble with loaned money, which would end with a few winning, and others getting into deeper debt and having to work to pay of their debts. After some coercing kaiji accepts a position on the boat, in order to clear himself and make a bit of money as well...
(Source: AniDB)