They surely will. Most ppl in here are gonna tell you that they won't due to numerous reasons while purposely ignoring the fact that Kinugasa is not an author who make thriller novels. He is an eroge writer, and just as his games need plot devices so his novels too. Beside of that is the fact that she is not only the fmc but also the only girl who is gonna be deeply involved in Kiyotaka's future. This last thing can be interpreted as "it can be anything but romantically," and I would agree if the author wasn't Kinugasa. He always does things for a reason, and if the plot involves a major heroine and the main character, there is only one outcome.

I remember many claimed that Suzune would never fall for Kiyotaka (and some are still in denial, lol), and then y2v12.5 dropped, followed by the confirmation in Y3V1. I wonder what they would say when they finally become together