Japanese horror films were really popular at the late 1990s. Most of the horror films were related to supranatural stuffs, like ghosts, curses, etc. Even some of them, like Ring and Ju-On was expanded into high-profits franchise.
However, Sion Sono brought Suicide Club as a very different 'color' to Japanese horror cinema at that time. Instead of making some ghost flicks, Sono made Suicide Club, a realistic horror about the darkness of the society at that time. Sono combined the story of thought-provoking mysteries of and his critic to the ambiguities and absurds of the dark and toxic society, into Suicide Club, a great experience of realistic satirical-horror, that able to 'gave' a really big question mark inside the audiences' head until the end of the film. The gore elements, 'blood sprays' and breathtaking soundtrack also gave me the usual vibes of 'Sion Sono's Bizarre Adventure'.