Twilight
After saving Akagi from a meaningless death, Yasuoka and Ohgi want to put him up against monster whose been causing the recent string of mysterious deaths, in a high stakes game. The monster that he will go up against is Iwao Washizu and his background is revealed. After spending two weeks with the Inaba group Akagi finally receives the call for the match worth 20 million but there seems to be some frightening house rules put in place.
Aired 11/01/2006EP 15 - Twilight

Akagi
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 a debt of 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.
(Source: MAL Rewrite)