Seems like Nayuki is the only girl in the series who'll end up getting shafted (in the sad sense). Every other one so far got her issues fixed by Super-Yuuichi, and Ayu seems to be "the one" in the end, with all the flashbacks and focus on her.
Apart from Ayu's dramatic parts, the 2 scenes that stood out most to me were
I'm starting to wish that Yuuichi ends up alone... Isn't it sad Nayuki?