I spent three days last week catching up with all 195 current chapters of Yofukashi no Uta (aka Call of the Wild), and loved it.
I just happened across it on the latest updates page at Mangadex, and read a few chapters and was impressed, and read a few more, and pretty quickly I couldn't put it down.
From the synopsis, it seems like it should be nothing special - insomniac boy wanders the streets at night, meets a cute girl vampire, hijinks ensue.
It's so much more than that though.
First and foremost, it's intricately plotted. All the way through, there are little details that are just sort of casually and naturally mentioned that are going to end up being crucial plot elements 20 or 50 or 100 chapters down the line. It's getting near the end now, but it's not a normal manga ending, where it's just been going along, alternating between story arcs and filler, and suddenly it's cobbling together something that might sort of serve as something like an ending. Instead, it's drawing together the last few elements of a story that literally started in chapter 1. That's such an unfortunately rare thing in manga.
And the characters, like the plot elements, are each there for a reason, and are each more than they initially appear to be. And again, it's not just that the mangaka made an eleventh hour choice to have a character do some particular thing. They were always heading toward whatever they turn out to be, and a lot of the context for it was already there - we just didn't see it, since the details were just slipped in naturally along the way.
And as if that wasn't enough, the art is terrific. It's sort of rough and stylized, but it fits the setting and the characters and the overall tone of the manga just about perfectly.
Definitely one of the best manga I've read in years.