This movie begins with a young woman running in fear from a couple of sex traffickers. They easily catch her and lead her to a room which has another woman hanging in chains from the ceiling. That woman is "Rei" (Maiko Tono) who is an agent for a special law-enforcement agency called "Zero Section". At any rate, while in the process of being raped the other woman manages to once again break free and tries to escape again. This gives Rei the diversion she needs to free herself and, even though the other woman is killed, she manages to take out all of those present in the room. We are then informed that this was part of her plan all along. Yet even though she has still not caught or killed everybody involved in this pervasive sex-slave operation she is informed that another new case now has top priority. Specifically, a group of terrorists have obtained a deadly virus which they plan to use on Tokyo and with the help of a bio-chemist named "Sara" (Megumi Yamanaka) her new assignment is to apprehend or kill all of those involved before they have a chance to put their plan into motion. However, there is one small problem with Rei which concerns not only a loss of her memory but also a powerful weakness that overcomes her whenever a certain piece of music is played at a loud volume. She believes she knows who is responsible for this but she has some concerns about facing this person again. Likewise, she also has an important assignment that needs her full attention. Now rather than reveal any more I will just say that this turned out to be a pretty good addition to the series with several sub-plots which worked quite well together. Admittedly, with two pretty actresses like the aforementioned Maiko Tono and Megumi Yamanaka, one would have thought there might have been a scene or two of an erotic nature thrown in but unlike most of the other films in this series it was omitted. I also didn't quite care for the ending but that's the way it goes I suppose. In any case, I thought this was a decent movie and I have rated it accordingly. Slightly above average.
