A Short Review:

Story: It's telled by the main character and follows his "stream of consciuosness", and follows the problems, loves, enjoyements of your 20ties. It seems sometimes over reality, but reality is usually worse. Not too complex nor boring, but funny, sad and makes you think: it will stick you on the chair. Not common

Art: to be a manga is very detailed, in particulars that usually are left to the readers (as backgrounds etc.), sometimes seems that something is missing. It's not Berserk, but it's very good.

Sound: good timing in writing them, but it depends on your fantasy too

Character: there are no flat character, every one has got a really good characterization, they all develop during the story (they are few, like your friends in real life). They are "really realistic", even if there are some idealization (you'll find out)

Enjoyement: If you are old enough you'll love this manga, if not, try to read it now and when you are older.
P.s.: try to read it with your hands on the desk!