It's very grim, and I like that. It really doesn't feel like anything good is going to happen to them at all. The brightest light of positivity that this manga has is just a normal girl with a job...
Honestly would like to see some more bad ending stuff. This is the kind of manga that would have that sort of thing. I don't really agree with the 7 flat rating of this manga, but I can see why it would have it.
I would recommend it, but it's not really entertaining in the way that you feel good reading it. I don't know how to explain it.