Shousetsuka no Shitsukekata
I wouldn't recommend this if you are looking for an actual romance. The novelist is a manipulative bastard and the editor lets him get away with far too much. It's very interesting from a psychological standpoint though. (and, you know, sexy times) edit: WOW AND I THOUGHT THE FIRST STORY WAS WIERD. all of these are very... dysfunctional relationships. They all have happy endings (as far as that goes) but uh... just make sure to read the tags first, okay?
Chasing the Sun
I know what you're thinking, but no, there are no vampires in this. (the mc's main love interest does dress up as one during a comic con, though!)
Bloody Sweet
Unlike the last manga I added, this one //does// have a vampire. The most puppy-like vampire in the history of writing, but still a vampire. The bullies make me want to set something on fire, and seem a bit unrealistic (then again, I've never had to deal with much bullying, so I wouldn't know.) but other than them, the story so far is pretty interesting!
Kajou Mousou Shounen
This is really interesting, I wonder where the writer will take it.
Ore to Omae no Stalker Boushihou