Hahaha! Rick Astley was to the point here!
Well, honestly, if she doesn't feel that way, then everything is futile. They can start dating, even marry and start a family, but that all...willl only bring them more and more pain later. That's why I hope she will find the courage to say that, right now, in the next chapter. I know that Ishigami is good boy, and he will stop after he went this extra mile and still got rejected. And this is even good that he went extra, to have no regrets and all...yeah, truly it is, moment emotionally accessible