I recommend this manga to every yuri/ girls love manga lover. Unlike many other shoujo ai manga, the characters in this piece are very well written and their actions are understandable. It's very refreshing to have a non-high school girls love story. Even the side characters are very interesting and I want to know more about them.
Also the art is amazing!! When I first saw the series at the book store I thought there are way to many speech bubbles and I wasn't really convinced to buy it. But later on I did anyways and I'm so happy about it since it has turned out to be one of my favorite series. It really looks amazing, the layout is just a bit confusing sometimes.
Edit: This has only gotten better and better with every volume. You almost never see characters who are so human and so real. It is so impressive how the author manages to set exactly the mood, the characters feel. Volumes 5 & 6 have a much darker tone, but the author does this in such a realistic way that's not edgy or cringy. These feel like real people from the real world, they just look 2D.