Love Allergy anything that is really close to it
Realistic
character growth
realistic obstacles
depth on character thoughts
both male and female situations (its ok if the story has female lead, of course i am expecting much more including all the points i listed)
hmmm good quality art (unique if possible)
iono female/male can be stubborn ....make the story longer

THANKS A BUNCH and please art quality really a must for me i can't take anything that doesn't look "MODERN HUMAN" or Realistic

= Stress is what we Live FOR =

/===CODE OF CONDUCT===~\
|A Life For A Life|

Kare Kano
Suzuka - realistic except for the part that a lot of girls fall for a loser like Yamato
Bitter Virgin
Mars
NHK ni Youkoso! - not sure if it's what you're looking for
Nana

I also recommend you to watch the anime Kimi ga Nozomu Eien

Diamond Head (highly recommend)
You're So Cool
Akuma de Sourou
I second Mars
Chizumi & Fujiomi and other Hikawa Kyoko works (they're realistic but definitely not drama if you're only looking for deep issues)
Living game

Can you turn into a leopard?

Besides the ones mentioned, you can read...

Clover by CHIYA Toriko
Kisu, Zekkou, Kisu
Kimi ni Todoke
Cipher
BOYFRIEND (Souryo Fuyumi)

These aren't exactly like Love allergy but have a touch of reality in them. As you can see, the main theme is romance.
Many SOURYO Fuyumi mangas are like that.

Mainly Josei can answer to your needs..

[img]http://i221.photobucket.com/albums/dd199/vivharv/Gokusen-1.jpg[/img]