Mieko Kaji, who would go onto fame as the malevolent Sasori ("Scorpion") and vengeful Lady Snowblood, cut her 70s exploitation teeth in "The Stray Cat Rock" series. The first installment was Stray Cat Rock:Delinquent Gilr Boss / Alleycat Rock: Female Boss (1970) directed by veteran Yusaku Hasebe, which is about a girl group led by Kaji that sees a charismatic motorcycle riding singer, Akiko Wada, join their gang. The get in tussles with another girl gang and have a knife fight that is broken up by the rival's yakuza punk boyfriend, Tatusya Fuji. There's a subplot with Kaji's boyfriend who is trying to fix a boxing match of his childhood friend Kerry and is killed when Kerry refuses to take a dive. Good exploitation fun, especially in the groovy 70s club with live music and go go dancers on pedestals. Furthermore, there are many location shots in the streets and subways(!) of Shinjuku station-which hasn't changed much in 50 years.