I'm still triying to understand why is there so many people saying that the other quints conceded... The only one that SEEMS to have given up is Ichika, while Nino doesn't, nor Itsuki (Yotsuba isn't even triying, tho). The fact that all of them come together to help Miku is only because they knew that most likely she would run away if she didn't have any support, but that doesn't mean that they have given up. The scene with Nino seeing the two together, for example, is just so it could be seen how she actually would feel bad if she wasn't the winner.