Anyone who has seen some of Godfrey Ho's cut-and-paste movies knows that any genre of film was fair game for these. He added ninjas to action movies, horror flicks, rom-coms, police thrillers and just about anything else he could get his hands on. Here, the original movie is a rape-revenge flick and the result is one of the sleaziest Godfrey Ho films I've ever seen. It is pure grindhouse material!
At the beginning of the film, three man attack a couple camping in the woods, raping the woman. The woman's husband, who is an Interpol agent, leaves her as she is now "tainted". As time passes, the woman (named Nancy) decides to seek revenge on the three rapists by tracking them down, seducing them and then killing them one-by-one.
By pure coincidence, the rapists happen to be members of a criminal gang responsible for counterfeiting money. As a result, the ex-husband is also chasing them down as part of his job. Nancy declares that she going to kill him after she takes care of the rapists as punishment for divorcing her. Despite this, he still wants to help her as he believes he can atone for his mistake by doing so.
Added into this already insane story is the fact that the leader of the gang is a secret ninja, and so are some Interpol agents, and throughout the film both groups are training so they can fight each other. This is rather disappointing for Godfrey Ho standards as most of the time, there is a lot of ninja action, but here they mostly just stand around saying there's no need for them to do anything because Nancy is taking care of the killing for them. This means there is even less connection between the two stories than in most of these movies.
The ending of the Nancy story is absolutely nonsensical and defies all logic. You will not see it coming because there is absolutely no foreshadowing of the major twist that occurs - seriously, watch it for yourself and be dumbfounded. The ending of the ninja story, on the other hand, is as standard as can be, as the good ninja fights the bad ninja one-on-one, with predictable results.
Objectively, the film is pretty bad and probably doesn't even deserve 5/10, but as a strange grindhouse-style viewing experience it's unbeatable.