Any dark manga recommendations?

So I asked a question on the forum for the same one but for books. Now I'd like to focus on manga (simply because I love it).

By 'dark', I don't mean full on horror. No, no. No consistent blood battles, flesh and gore, ripping...no... //shivers

I like the occasional blood which gets you like : O but not all the time, y'know?

I like the gloomy setting and the kind of slow build up on the story.

If you still don't know what I mean (because it's quite difficult to describe) it's like "Black Butler" or "the girl from the other side"

I'll add attachments. :biggrin: