If My Heart Had Wings – Amane Pilled
I can say with 100% certainty that Mochizuki Amane is the best character inside this visual novel. No one else even comes close in comparison and quite honestly, I’m surprised you’re unable to do her route without having gone through Kotori’s first. Perhaps the writer understood that Amane was the peak, and forbade us mere readers from experiencing it early, because everything would have been downhill from there.