Ako is a biker who runs into girl gang the Stray Cats about to have a knife fight. After intervening to save them, she joins the gang and befriends their leader Mei, slowly climbing the ranks to become a leader. Meanwhile, Mei's boyfriend is trying to join a far right nationalist gang called the Seiyu Group, and tries to convince his friend to throw a boxing match for them. Ako and Mei unwittingly convince said friend to win the match, starting a Mob War between the Stray Cats and the Seiyu Group.
This film received four sequels:
- Stray Cat Rock: Wild Jumbo (1970)
- Stray Cat Rock: Sex Hunter (1970)
- Stray Cat Rock: Machine Animal (1970)
- Stray Cat Rock: Beat '71 (1971)
This film contains examples of:
- Bifauxnen: Ako is easily mistaken for a boy in her biker garb, due to being a short-haired Tomboy.
- Big Bad: Mr. Hanada, a gangster who declares war on the Stray Cats.
- Chickification: Toshio starts the movie as a vicious sadist who tortures Yuka for fun, and ends as Katsuya's pleading girlfriend who is last seen in his bed.
- Cold-Blooded Torture: Toshio decides to burn Yuka's chest with a blowtorch For the Evulz.
- Disc-One Final Boss: The film starts with the Stray Cats battling a rival gang led by Toshio, but she's knocked out 30 minutes in, after which her boyfriend is revealed to be working for a bigger gang led by Hanada who become the main threat. Toshio herself basically becomes Katsuya's pleading girlfriend near the end.
- Fan Disservice:
- Yuka's shirt is torn open by Toshio, who proceeds to burn her with a blowtorch.
- Mari is naked while being violently interrogated by the Seiyu Group.
- Greater-Scope Villain: Mr. Konto, Hanada's boss, only appears briefly to berate Hanada's hotheadedness and is never seen again.
- Japanese Delinquents: A Trope Codifier for the sukeban or girl gang subgenre of delinquent films.
- Karma Houdini: Nothing happens to Toshio after she tries to massacre the Stray Cats and tortures one of them with a blowtorch.
- Mob War: The Stray Cats enter two of these over the course of the film, first with an unnamed rival gang Mei used to be in and then with the far-right Seiyu Group.
- Non-Actor Vehicle: The lead is played by pop star Akiko Wade, who also does the soundtrack.
- The Pirates Who Don't Do Anything: The Stray Cats are mentioned as being involved in crime, but it's never made clear what sort beyond the occasional street brawl.
- Politically Incorrect Villain: Some nationalist rhetoric is spouted at the Seiyu Group's introductory meeting, but it never comes up again in the film itself and just seems to be a way to make them more unlikable.
- Right-Wing Militia Fanatic: The main villains.
- Thematic Series: None of the Stray Cat Rock series are connected, being wholly unrelated films connected by being about female delinquents, starring Meiko Kaji and being distributed by Nikkatsu.
- Throwing the Fight: The Seiyu Group task Michio with convincing his childhood friend Kelly to throw a fight so they can win 40 million yen from in gambling. The Stray Cats unwittingly ruining that starts the war between the two gangs.