I finished this manga a few months back, and I am just now making a review out of it.

The story is about a girl named Nanami Takahashi, who enters high school and falls in love with a popular boy named Motoharu Yano . She eventually gets to date him and as time passes by dating him, she learns about Yano's past and his problems of being unable to move on.
As the story progresses, it does indeed get hard for her, for she never fell out of love for Yano in the future.

All I can say is out of all the shoujo and romance manga I've read in my life so far, this has got to be my number #1 absolute favorite. It feels realistic and not at all dreamy. It's a happy, yet painful ride, but the read is absolutely worth it.