Finally got around to reading this and I gotta say, I feel so badly for Ruki. Maybe it's because she's the character that most people can self-insert with, but man.. seeing her getting cucked by Remi broke my innocent yuri-loving heart. I really enjoyed this manga for the most part other than the fact that Shuninta really stressed the 'Remi-is-a-bad-person-and-will-steal-your-girlfriend' trope. There's never really an explanation to her character other than the fact that she does what she wants when she wants.
Overall this was a good manga, but I can see why people would dislike it. A lot of people who mostly read lighthearted yuri probably won't like it that much. It took me a bit to get accustomed to the serious tone. The way (most of) the characters were depicted was really nice and thought-out.