Don: Gokudou Suikoden
Genres: Drama
Type: OVA, Episodes: 2
Aired: Jul 1, 1992 to Sep 9, 1992
Studio: J.C.Staff
Source: Unknown
Rating: R+ - Mild Nudity
Synopsis:
Takekichi and Masakazu are two tough guys who are forced to go underground when they lose their boss in a turf war in this modern update of the classic Chinese novel "Water Margin". 

(Source: The Anime Encyclopedia)