I want to like this, and it's interesting and different, but why, why, WHY do they always have to "become pretty?" Can't it ever be that they find happiness and confidence without having to physically change? I hate this sort of thing so much. Whenever there's an "ugly" girl as the main character, generally people are just cruel constantly, then she gets super hot and everyone is nice, and no one ever gets their comeuppance for being crappy. It's just reinforcing the idea that women are only worth how attractive they can be to others.
I say that assuming that's what happens. I will be shocked if she doesn't suddenly become beautiful because of the doctor. I'll change my rating if she doesn't, but since she probably will, I'll tentatively keep reading.
Koi no Kiseki