Akagi

When several man are deceased with blood loss extracted from their arm by a serial killer, Yasuoka identifies one of them, Hirayama Yukio, the fake Akagi. It leads him to invite Oogi, the second in command of the Inada yakuza group, and tell him about his suspect. Yasuoka says Akagi is the one who could defeat the murderer, who is a mahjong player that kills his defeated opponents. Inada says there is someone similar to Akagi playing chou-han on Kurata, a subgroup of Santou, which is also the header of Inada group. There, they find Akagi who almost dies from a sword cut after gambling with yakuza members. After rushing him to a hospital, Yasuoka and Oogi talk about the case to Akagi, requesting him to play a match against the murderer. (Source: Wikipedia)