Mahjong Demon 4: Mahjong Proxy War.

Kabukicho, Shinjuku. Shoichi Sakurai meets a man who goes to a mahjong parlor from 9am to 5pm and realizes that there is something missing in his mahjong. Next, a soba restaurant owner from Karuizawa who lost his land because of mahjong appears before Sakurai. Sakurai teaches him mahjong when he asks for his help, but...