A lot of sex, not a lot of story. The main character was (deservingly) made a fool of in his high school class. He leaves the class then imagines each of his classmates and teacher in separate stories. Each separate story begins with the classmate introducing themselves briefly and then it develops to a sex scene usually including rope bondage with the sex which definitely qualifies as rape or assault. In one case an enema is included.
Be aware that it "Appears" that much of the sex may be unsimulated and there is more nudity than previous pink films. "Appears" because there is a heavy mosaic (blurring) over any genitals and action so you can't actually see anything! In Japan in 1986 you couldn't even show a single pubic hair and genitals still in 2023 need to be fogged/blurred although at a much lesser amount than in 1986.
There are more sex scenes than in most pink films. I didn't find most here that exciting except to see what happens next. It's the What's Next that kept my interest throughout.
If you aren't interested in the sex scenes or bothered by scenes of violence towards a woman then you won't want to watch. But if that specifically is what interests you then you'll enjoy this movie.