If you liked
Kimi no Iru Machi, check out
Suzuka. It's by Seo Kouji; the same author.
I also found
Onani Master Kurosawa an enjoyable, yet somewhat sad, read.
Edit:
Also check out
GE ~Good Ending~ and
Pastel. Can't believe I forgot those two.
Follow the links to read the descriptions, then decide if they are for you.
Hope these help.