Binged read this the past 2 days. Probably my favorite Harem manga. There isn't really any trash girls imo, and my rankings of them as who I want to end up with MC keeps switching throughout the show. Based on tropes, Itsuki seems to have the best chance, although the author can do a full asspull and end with Yotsuba (even with the least character development) by having her be "watching him and supporting him over all this time." That kiss scene on episode 68 seems to be something Itsuki, Miku, or Ichika would pull. My current ranking is Miku > Itsuki > Nino > Yotsuba > Ichika, although Itsuki and Nino are basically neck to neck for me.
I also think that line "I started to think she was special" doesn't really hold any candle since he did say afterwards he can't tell who she was after all.