I hate to say this but sadly we all know who's gonna become a couple with Fuyuzora. Chisaki x Fuyuzora is unlikely gonna happen. Unless... the author would decide to take a risky move and that's Yuuna passing on- which I highly doubt it would happen, cuz you know the title of this manga says it all. But I'm gonna say it's gonna be a harem ending.
But honestly tho I've never seen something crueler than this story in a romcom manga. I mean.. living a happy life for literally eleven years but turn out it was all just a dream? nani the fuck author? is he planning something for her?
God damn it. Just....just make it a harem end. Usually I want one girl to win but this just makes me sad/angry. Kogarashi seems like the kind of dude to actually treat his harem well so....just go that route author.