Touhai Densetsu Akagi: Yami ni Maiorita Tensai

On a stormy night in Tokyo, Nangou is losing a mahjong game in which his life is the collateral for his debts to the yakuza. A mysterious boy named Shigeru Akagi arrives, and the desperate gambler gives him his seat despite the newcomer barely knowing the rules.

Akagi compensates for inexperience with piercing intuition and a willingness to take risks that unnerves seasoned opponents. His talent draws him deeper into the gambling underworld, where reading fear and exposing deception matter as much as the tiles, and every confrontation tests how far he is willing to go.