I didn't like romance type genre but then again reading a lot of review pulled me into watching this anime but I'm really glad I watched it and as for my favorite arc at first I was satisfied with morishima haruka's arc it was both entertaining and good. After that I felt the rest was not as interesting as the first but up until ayatsuji's arc it was far off from my expectation to be blunt the rest was interesting in its own way but quite predictable.
Ayatsuji>Haruka>Nanasaki>kaoru the rest was quite average in my personal opinion
Please don't flame me for making judgement as I have said it's based on my opinion