Stuff that others haven't recommended (I think):
Two and Two by Yoshitomi Akihito - one of the most unique love triangle mangas, specially the ending (I hate love triangles, but I was not able to hate this one)
Sweet Little Devil by Nanzaki Iku - Mature content rather short chapters.
First Love by Suga Atsushi - another short one, romance manga.
Unchanging Days by Aki Eda - Yet another short one, romance manga.
The Real Her by Imamura Youko - Nobody suggested this one? /sad. It's my favorite romance. (on-going series, ending soon)
Roommates by Tamamusi - Romance, has a tiny bit of mature content.
Arcadia ~Flowers of Paradise~ by Mizuno Touko - short supernatural romance, mature content.
I Fell in Love For the First Time by Asagi Ryuu - Smutty mature content, Asagi Ryuu does some pretty good romance with mature content, unfortunately the mature content is... rather umm... There are lots of fluids...
I Want to be Honest by Asagi Ryuu - Same mangaka, same warning ^ additionally: It's about 2 different couples who, near the end, suddenly have an orgy... yea... xD
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Not sure on how you stand about non-originals, but theres a few doujin series that I recommend (don't need to know the original series, they stand on their own quite well, as is most of the cases):
MariAli by Ichinose - (Touhou Project doujin) gets a bit too angsty maybe, pays off quite well IMHO since it does not last long
We Went On Our Honeymoon by Ayukko - (Madoka doujin) cute short story, just about em going on a honeymoon...
NicoMaki - Dating Life by Nebukuro - (Love Live doujin) Romance, mature content on the last chapter, quite nice.
last edited at Oct 12, 2014 12:00AM