Akagi.

About Akagi

Akagi: Yami ni Oritatta Tensai is a Japanese manga series written and illustrated by Nobuyuki Fukumoto. First published in 1991 in Takeshobo's weekly magazine Kindai Mahjong, it is a spin-off prequel to the author's previous work Ten. It revolves around Shigeru Akagi, a boy who defeats yakuza members well versed in mahjong at 13. He returns to the game six years later, carrying a mythical status and still impresses his opponents.