HERO: Akagi no Ishi wo Tsugu Otoko

Overview

Set in 2002, 3 years after the death of Shigeru Akagi. Hiroyuki Igawa, following the advice Akagi gave him on his deathbed, runs into his old friend Ten while visiting his grave. Hoping to put his own abilities to the test, Hiro challenges Ten to a game of mahjong, but Ten disappears right as their match reaches its climax, and thugs looking for him wait right outside the parlor. They take Sawada hostage, and Hiroyuki is given only a week to find the seemingly abducted Ten.

Source: AniList