The confessions aren't taken seriously, likely because the girls DON'T KNOW HER. You wouldn't accept a confession from someone who knew nothing about you (and vice versa) other than your name and face, would you?
I never get this, though it seems to be the most common element of shoujo. "Your face is pretty, have my babies." or "Your face is pretty, so my social status is increased by being with you."
Funnily enough, the latter is only true for non-main characters. If you're a main character, the actual outcome is "Your face is pretty, so everyone is jealous and wants to beat the shit out of me."
So her asking Miu to break up with Fujiwara, as if she had a better chance, just makes me roll my eyes.
This event makes me think that it's only going to last 4-5 chapters. That seems like a catalyst to "Oh, wait. This isn't fake, I'm in love. I don't want to break up."
For a tall, sporty character, I think Kase is far superior to Fujiwara. Actually, for any tomboyish lead, Kase is the most superior in my opinion.
http://dynasty-scans.com/chapters/kase_san_ch04#11
vs.
http://dynasty-scans.com/chapters/the_princesss_mirror_ch02#7
Back to the actual story, though. I wondered about the boyfriend part. From other Morinaga works it seems that "girlfriend" is used, so it's most likely not just the viewpoint of Morinaga on lesbian gender roles. I'm not going to analyze that part given that there are only two chapters – I want to see how the relationship terminology changes before I make my judgement.
Actually, I just dislike hard analysis until the entire piece has been read through, first.
I wonder if there is some emulation here given that Kase-san has been doing well in Hirari? It always seemed to me that Morinaga preferred very feminine characters reflecting a refreshing lack of gender roles, so I was surprised by the addition of a story with a boyish girl and the "boyfriend" terminology.