It's been a long time since I last read a manga which is that good. Well, that's because of a few reasons.
First of all, I'd say that the drawing has something bewitching. It's not an accurate drawing but it somehow looks like art, like a painting. It reminds me of TOUME Kei's drawing. ( Sing Yesterday for me, Laments of the lamb, The Hour of the Mice... )
As for the storyline, no supernatural things, no action, no horror but a crude slice of life. It's not a " Soap Romance " as you often read or watch. To me, in this manga, NINOMIYA Hikaru shows both the pleasure and the harshness of Life.
Speaking of the sex scenes, in my opinion, they're really romantic ; Nothing to do with a hentai slaughter...
Finally, as it has already been said, I think that the characters are well developed and are very lovely in their own way.
To put it in a nutshell, it would be a pity not to read this manga especially if you like romance !
PS : Don't mind about my rating, i'm really severe with it.
PPS : Sorry for the bad english... Actually i'm a frog-eater...