I saw this movie as part of a double feature in a movie theater I believe in Itabashi area of Tokyo around 1978. The other movie I think was Momojiri Musume, and that was the movie I actually wanted to see.
I was amazed at the audacity of the character to climb up the wall of a condo to rape a woman. Then after that it was non-stop sexually themed violence throughout the movie. The movie left an impression on me that I haven't forgotten through the years.
I couldn't remember the title of the movie, but I've seen it recently again. The ballerina girl I thought was Izumi Shima, but it wasn't. Each of the movie's character has a shabby poetic- ness to them. Nikkatsu's Roman Poruno series movies usually has a happy go lucky style to them, but this movie is unusually dark for this series.
One of a kind sex movie that goes beyond mere porn due to its audacity. It's definitely worth checking out if you can find it.