Legend of Mahjong: Akagi
Mahjong Legend Akagi: The Genius Who Descended Into the Darkness
Tohai Densetu Akagi -Yamini Maiorita Tensai- (Japanese)
One stormy night, Nangou is playing a game of Mahjong with the local yakuza. Soon, he finds himself on a losing streak. If Nangou loses, he will have to pay with his life. Suddenly, a young teenage boy, Akagi Shigeru, barges in, drenched from the rain. After watching a couple of games, he offers to replace the struggling Nangou. At that moment, a new legend was born.
an extended description!