I've been on the Nino train since chapter 1( she's my favorite, I love her peronality), but lets be honest here, she won't win. I also hightly doubt first girl will win in this manga, so the bride won't be Itsuki. Miku is just way to shy to win at this point ( she needs to get over her shyness and fast). Ichika is not going to win either. Futaro doesnt like being toyed with as shown in previous chapters. The one I think will win in the end and become Futaro's bride is Yotsuba, why? She's the only one not actively trying to get with him and talks to him normally. They also seem to have really good chemistry together. This is just my opinion from reading up to the current chapter so far