Noisy Requiem is the most well-known movie of the few directed by underground director Yoshihiko Matsui, who showed the script of this film to his friend, director Shuji Terayama, who said that if it were ever to be made into a film, it would evoke scandal. Terayama died before Matsui made the film, which took five years to make (it's even dedicated to a crew member who died before it was finished).
This film takes place in the slum-like, poverty and insanity-ridden streets of Osaka filled with marginalized outcasts whose sexual perversions and shocking understandings of love are presented on screen. It's an uncompromising and shocking look at alienation which mixes the dirty industrial setting with an ethereal, melancholic mood. The filthy B&W scheme is contrasted by the absolutely beautiful melancholic soundtrack by Shigeo Suganuma, mirroring the thin line between love and violence between the film's characters. It also establishes a remarkable marriage of gritty realism and surreal shock factor.
A bit too long and sprawling at 150 minutes, but this is one of those movies that you never forget. It is incredibly shocking, violent and transgressive with a harrowing, depressing atmosphere. Fun fact: that rooftop was actually set on fire by Matsui and his crew.