西門城裡的兩大幫派，以GUCCI（楊謹華 飾）為首的峨嵋幫與剛從國外回來接掌幫務的西門堂主PORSCH（吳辰君 飾），兩人看似仇人，事實上，卻有著血濃於水的親姐妹關係，原來，PORSCH和GUCCI是同父異母的親姐妹。卻在同一個地盤上，註定爭個你死我活。

Due to a combination of bad writing, unnecessary and distracting directorial gimmicks (split screens, black & white, slow motion, etc.) and very inept subtitling, "West Down Girls" is almost completely impossible to follow, but I think it has something to do with the rivalry between two girls who are members of opposing street gangs, and the arrival on the scene of a third girl who is the childhood friend of one of them and the sister of the other. The (very few) action scenes are a complete mess. The film is basically an over-the-top melodrama and makes very little sense. I was too frustrated to even enjoy the beauty of Cheryl Yang and Annie Wu.