Jisatsu Circle is a horror manga that combines its suicide culture and a theme seen in many Japanese horror material: the "cycle" of a deadly legacy to others. 
 If you are just new to Japanese horror fiction, then Jisatsu Circle (or Suicide Club) is a really, really weird material to read. The gore may be too much. But there are numerous titles which are much weirder and gorier than this. What gives Suicide Club a slight edge over the others is its tone of an unknown evil lurking, perhaps in the subway, or in a computer screen at midnight, or in each tattoed earlobe. I have had the same feels while watching The Ring. 
 But besides that, Jisatsu Circle from a technical standpoint is pretty much a straightforward story of an unending cycle of suicide, with a subtle commentary about Japan's Internet and prostitutuon cultures. Halfway through the story, everything is revealed and unlike other horror stories, there's no twist at the end.