Can someone suggest a romance manga?

I would suggest 你 to read Fushigi Yûgi Genbu Kaiden.The plot is awesome and the romance between Takiko and Uruki is great.The main character is Takiko and she's strong,smart,good hearted and beautiful and Uruki is a really good looking guy too(who also has other positive traits as well).Here's an art of Takiko and Uruki from the manga.

Paradise 吻乐队（Kiss） is a really short 5 日本漫画 series...
if 你 like it then there's Nana 由 the same person
and Cantarella is another really good series

Akagami no Shirayukihime, aka. Snow White with the Red Hair. The girl with the red hair and the guy with the white hair are the main characters, and I can assure you, Shirayuki has a very strong will and Zen is definitely good-looking!