I will try to not spoiler too much and keep everything in general.
In short the manga starts strong with a depressive atmosphere and shows some very interesting characters and developments. Sadly the MC is the worst and drags the story down big time. I enjoyed the beginning but the closer the story got to it's end the worse the series became and left me with a bad aftertaste.

Story:
The story starts with the MC running away from his troubles at home to Tokyo where he found work with his particular problem. In Tokyo he encounters lots of different people with for better or for worse different secrets (not all of them are bad some quite nice :D).
This leaves the MC with the chance to mature bit by bit but sadly he does not. He matures for a single moment only to revert back to how he used to.

Characters:
The Characters feel all fresh and enjoyable aside from the MC and his childhood friend and brother. They are not all good people but bring something to the table with their own problems and ways of dealing with them but the MC drags them down big time.

Enjoyment:
I had my own depressing times and therefore can relate to the sad tone which the story shows in the beginning. I enjoyed it and all the characters until everything became repetitive. The MC never betters himself. As the manga came closer to it's end it simply became worse and worse and my enjoyment was gone. I was hoping that the story takes a turn for the better but it never did.

The ending (generalized without too much of a spoiler):
The ending is a open one and brings nothing to a close. It leaves me depressed and I wonder if the manga was axed and had to suddenly come to a close which would not be surprising