I wasn't aware that this was a retelling of an actual rape murder in Italy and so I felt there was a lack of context for much of what happens, which sort of colors my review.
The first two thirds of the film follow a group of Catholic school boys -most of whom look to be in their mid twenties with receding hairlines- and their families, observing their caricaturized machismo behavior and sexual frustration through a bleak lens, portraying all of them as shady, violent deviants in the making. The director seems to be making the argument that all the boys are capable of the crime by showing us glimpses of their toxic bro culture and unsavory views on women, but it's done in such a broad way that we never really engage with any character in particular. One boy narrates the film, but there is no real protagonist and nobody to root for, bar the two female victims who appear in the final 30 mins.
Many of the plot points feel random and irrelevant to the over-arching narrative. For example, a lot of time is spent setting up one of the boys as being gay, but this never leads to anything. In another scene there is a traumatic accident involving the narrator's younger sister, but it just comes and goes without a sense of why this event is significant, or what imprint it has left on the characters.
The final third is a drawn out re-enactment of how three of the boys lure two young women to a house, imprison, rape and murder one of them. It's disturbing and believably acted, but my lack of context led me to feel like it came out of nowhere. The ending left me with a hollow feeling and while I appreciate it brought the victim's true story to my attention, the film didn't convince me of any of the sub textual points it was making about religion or masculinity. It was overall very scattered and confused.