I didn't like Marika in the beginning. But I have really enjoyed the last couple chapters with Hachiouji and her. It's much better than the stupid idol/oshi worship arc.
I don't mind yuri; what I didn't like about her is how forceful she was about making Sawa the prince (I also hate Oota and the other fans for the same reason). So, I like that she let Sawa be free by approaching Hachiouji.
Also, I'm sure she had viewed him positively if we look at the chapter where he confessed. So, it's not like she was trying to date someone she didn't like. More like she chose the 2nd person she favored. And based on the doujin, it seems like her interest in him going to grow even more.
I picked up this manga because I like the artist's other works so much. In fact, I like Marika's appearance so much. But the oshi plot really turned me off. But now I'm enjoying this more.
Btw, this arc kinda reminded me of the lesbian girl and the persistent bf from Nijiiro Days.