I've read Umi ni Sora and loved it~
Please check out my manga list on mal before recommending anything!!!
http://myanimelist.net/mangalist/PsychoKitteh

This is probably going to be moved.

Present (kurata uso)*
Love me softly
dusk, orange, the blooming flowers*
forever girls
graffiti*
oniyuri-san and himeyuri-san
urbane
fall in love (morinaga milk)
the structural formula of first love*

• = ones I really liked