Probably one of the best school life series on here at the moment. That is, if you accept what some found to be incoherent writing, which also could be interpretated as a slight slice of life tinge. To be fair to the author, there is plenty of interaction between Yurine and the other couples from which Yurine profited immensely. I'm still not sure whether or not I really like Ayaka and the tsunderays she beams down. The story picks up after the first two chapters, which have their focus on the main couple (is there actually a main couple? Moe and Mizuki are fierce competition).
On the rose garden arc: I got the notion what Towako does is not only about the garden they built together, which they are inevitably going to leave behind one way or another, but about her relationship to Yukina in general, which is asymmetric what with Yukina's high social standing, Towako being the employee's relative and the fact that she probably sees herself as totally dependent on Yukina. Whereas Yukina could only be dependent on her if she requites her feelings (which seem to be of a romantic kind - thus compounding the whole situation). Having surmised her chances to be low, she was trying to burn all the bridges to Yukina to live off the preserved memory of Yukina.
I don't think the whole thing was her being possessive and 'yandere', but angst-driven and desperate. I was glad Yukina turned out to have a big enough heart to forgive her and loved her back.