I think the title says enough, but I'm looking for some romance manga that has a relationship between a nerdy guy or shy and quiet guy and a pretty (and maybe outgoing) girl. Bonus if she's oblivious to how he feels, but it's not necessary!

Maybe Suki tte Iwaseru Houhou?

Iris Zero?

Suzuka? he's not exactly quiet or nerdy, more like ordinary and average.

[img]http://img267.imageshack.us/img267/4466/princesswallpaper2560x1.jpg[/img]

"In a world where most people would be crazy, then it would be normal to be crazy and crazy to be normal... but then again, if you were normal, then you would be crazy... isn't it crazy what a paradox a little craziness can create?"

Haha, what about Train Man: A Shojo Manga?

there are plenty of 'quiet' guy with sudden girlfriend series.

Sekirei for instance.