Each of the three films starts out the same with a definition and entomology of a Kunoichi, or female Ninja, going back to China. The three films are soft core films and have very little to do with actual Ninja fighting. The first film, "Ninja She-Devil," I found to be the most erotic and you might opt to watch it last for whatever reason. They movies are not connected and can be watched in any order, the older of the films being the third in the set.
The duty of the Ninja is to be captured and groped
On three separate discs.