Hello

http://www.mangago.zone/read-manga/dark_heaven/

It starts out light but actually has a very complex plot the more you dive in. It's the kind of story that gets you thinking "oh so he was the one who did that" then it blows your mind. Full of murder scenes, torture, so much smut and discusses a lot of social issues. I don't want to spoil much but it's a great read if you can pull through 80-something chapters. Art is beautiful too.
I may be biases because I just finished it but it's definitely worth your time if you haven't read it yet !

Blood bank also comes to mind but it's pretty popular so you may have come across it before.

Thank u so much and yess i don't mind if it's more than 80 chapter actually i love long ones....and yesss i finished blood bank and it's one of my favourite mangas ε=ε=(ノ≧∇≦)ノ

Tell me what you think of it after you're done ! >w<

Got it!

I just don't know what to say...i was about to stop reading it many times because it got so dark and complicated but still continued reading it....was so happy with the ending and satisfied with it...but really this manga should get more attention cause it really does deliver a lot of meaningful messages to us.....thank u so much for recommending it(⌒▽⌒)

I'm so glad you like it ! This is the first time I recommend something and it really makes me happy that you enjoyed it ><