Women in Prison

Entry number 37 in the Nikkatsu Erotic Films Collection, is a rather grim, bloody take on the WIP genre, with a great perf by Erina Miyai. She plays Ryoko, who gets sent to the clink for attempted murder after stabbing her two timin' man with a pair of scissors. Aside from some lez shenanigans, this one eschews most of the genre tropes, and instead hits you with some plot twists and depressing reveals. Oh, but there is one scene where an inmate puts a cat's tongue to use that you hafta see.

The Impulse dvd looks to be tape sourced but is definitely watchable.