Reading this manga made me lose hope in humanity. The story is very weird and of course being a horror you can expect some (many) splat scenes popping up at times.It was so different from what I usually read that it fascinated me greatly! It shows you the worst side of humans, it can be shocking and a bit disturbing, but sometimes it's useful to read stuff like this and reflect on our nature (I know that we aren't all that bad but sill).
The most interesting thing though for me was the relationship that the two main characters had with each other. It was the best part of the story.
Mukuro Chandelier