I think the introduction of a second girl was inevitable. For the MCs ideals of a woman to be definitively challenged we needed a girl who matched his ideal girl to contrast what he has with Fuyuki, I'm usually annoyed when a second girl pops up in series like these but as many times as the MC...
I was hoping this wouldn't turn into a love triangle situation. I'm sick of that kind of thing. Sometimes, you just want to see two people growing closer together.