Ok..
Fruits Basket -- not romance but its one you might like.-seen it was ok
Gift ~ Eternal Rainbow~never seen
Happiness-lol

Ichigo 100%-seen loved it
Happy Lesson- havn't seen these...
Happy Lesson Advanced
Happy Lesson Final (Happy lesson isnt intense romance but still nice series)
Magikano-seen didn't really like
Tonagura-seen it was ok
(Gift, and Happiness are probaly closest to what you want.)
yeah probably gift
this is going by your list.. so idk how much of it you have seen lol.