I think now the authors have a thing to select the heroine who didn't have the most romantic time with the MC (in this case Yotsuba had WAY less interactions with MC than the other sisters) but well, looks like its not ending soon, probably he visit all the room after this and he select someone else, maybe the escene where nino, ichika and miku where, was after this.
But if not, glad for Yotsuba. First come first serve (?) :u
Also when did the last page was? i don't remember that letter to Nino or it just a joke from the TL?