English Title: Simple 2000 Series Ultimate Vol.21: Kenka Jōtō! Yankee Banchō ~Shōwa 99-nen no Densetsu~Retro-future beat-'em-up featuring Japanese street gangs in the vein of River City Ransom, only in full 3D. Too bad it's only 1-player. I can't actually say how the game plays, because a solid ten minutes with it just got me a bunch of cutscenes and running around a street with no enemies. Must come back to this one later...
Japanese Title: SIMPLE2000シリーズ アルティメットVol.21 喧嘩上等!ヤンキー番長 〜昭和99年の伝説〜
Publisher: D3 Publisher
Released: Nov. 11, 2004
Product Codes: SLPM-62558 / JAN 4527823992801
Got a PAL release with the laughable title Street Boyz.