I've read up to the latest raw released of this series and the heroine's situation is totally opposite of what is stated in the summary (except the lover part I guess... and the childhood friend).
Anyway this is another childhood friend unrequited love story BUT at the same time it is not your typical childhood friend love story because the author (thanks goodness) decided to replaced what you usually detest on those stories and replaced it with good stuff.
As of chap11, I'm really loving this. Koharu is lovable. I like that she doesn't dwell much on the negative part of her unrequited love but she tries her best to find the positive part on it. The main hero Natsuki is also a great guy, we might not know if he loves Koharu or not (that's not a fault, everyone is free to love whoever they want, that not a crime, don't hate him for it!) however he had proven multiple times that Koharu is a very important childhood friend. The side cast are also wonderful and interesting.
What I like most in this series is that the pacing is good, the story doesn't dwell much on the usual drama this type of stories faces but shortens it and takes on a positive root. I really can't tell how this story will end, the author has shown so many possibilities with the plot and right now I'm just looking forward to the next released.
I recommend this to people who likes this type of stories because you will enjoy reading this! And to people who read this type of stories in the past but got tired of all the cr*p the heroine normally has to take from the hero and now stays away from it. Don't worry Natsuki is awesome, he acts the way a friend is supposed to act, he really cares for Koharu.