The fourth and final of the first Female Prisoner Scorpion series, this movie has Meiko Kaji coming back to portray Nami Matsushima - the Scorpion - one more time. However, director Shunya Ito was replaced by Yasuharu Hasebe, who worked with Meiko on the Stray Cat Rock series. Scorpion remains on the run after the last film, starting things off the same way, with a lone voice screaming her name.
This time, our heroine is found by the police - including her new nemesis Hirose - in a wedding chapel. Despite handcuffing her, she's able to escape and makes her way to find Kudo, a political radical who now works in a sex show club. He's covered by scars from multiple run-ins with the police, so he has no problem keeping Scorpion hidden.
However, one of the girls in the club, upset that Kudo had rebuffed her advances, finds the detective's handcuffs in Kudo's room and calls the police. They show up and beat Kudo until he finally gives in and sells out the Scorpion. Yep, she falls in love with him, even gives her body to him willingly unlike every other time in this series and he still lets the cops know where she is. He even leads them to her. Bad move, Kudo.
Soon, Nami is back in prison and sentenced to death. Despite a guard who reaches out to her and asks her to open her heart and ask for forgiveness, Scorpion finally reappears. That's my main issue with this film. Despite opening with an awesome sequence of Scorpion in her trademark trenchcoat and black hat, the rest of the movie is all about Nami reacting and running instead of being the master manipulator that we know that she can be. That said, by the end of the film, she comes back to who she should be all along, escaping the prison with the help of the warden, murdering the detective who won't give up on capturing her and then returning to find Kudo, getting her revenge. She tells him that she didn't stab him. Instead, it was Nami, the woman who fell in love with him. Now, she is only the Scorpion.
This is the final film that Meiko Kaji would play Scorpion, but in 1976, Yutaka Kohira would direct New Female Prisoner Scorpion: #701. He followed that up with New Female Prisoner Scorpion: Special Cellblock X. Evil Dead Trap director Toshiharu Ikeda also presented Scorpion Woman Prisoner: Death Threat in 1991, a new version of the story.