This is one of Nikkatsu's Roman Poruno (Porn) series movies. This was as explicit as they can go in sexual expression on movies in the '80s Japan. Now this movie is available in region 2 DVD as is many of Nikkatsu's Roman Poruno series movies.
Ran Masaki plays the role of a beautiful (and I'd say she really is beautiful) school teacher who is recruited by another teacher played by Izumi Shima. Not knowing that she's really walking into a trap, she starts her new career at a high school in a remote mountain town. Soon she gets involved to save a girl student who got captured by delinquent male students. She is challenged to fight a kendo (Japanese sword fighting) match with one of the student while wearing nothing under her protective gear. Not knowing that she's being captured on a video, she gets gang raped by the boys. Next day, she's invited to the house of the girl that she tried to rescue. This was the beginning of the real trap. Soon she's drugged, and is captured in a torture chamber, designed to give sexual abuse.
This is one of many Oniroku Dan's SM movies that Nikkatsu produced at somewhat regular intervals. Frontal nude was illegal in Japan back then, so there are no really hard core sexual scenes in this movie. These days, this movie is not even categorized under "Adult Video" in the Japanese video sites. Things really changed in 25 years. Where they lacked in explicit expression, they've made up in quality production, and many of the Roman Poruno series movies really has good plot and acting featuring good actors.
Watch it for Ran Masaki's debut performance for Nikkatsu. She really looks good.
