Read Octave in one go yesterday. Octave is one of those stronger yuri stories that are actually dramas and not just romances, pretty well regarded.
It's pretty merciless, too. I was not expecting it, but it's particularly good at exploring weakness and failure. Left me in a pretty poor state of mind to be honest. I wouldn't say it is particularly "real", because much of it feels like the delirious perspective of a truly weak person, but it feels very human as well.
Overall not a good read if you're depressed. One of the strongest mangas i've read, otherwise.