IMO-The anime might have a different ending due to the fact of the hair. In the anime, the Brides' hair is red unlike Yotsuba's or Miku's (season 2). It might be just because they all have something close to red. Also, we know Yotsuba likes him but she hasn't tried to progress their relationship there could be a 3rd season wrapping up their relationship and showing how it happens but I personally want it to be Miku or Ichika.