i couldn't figure out who one of the white Red haired girls on the left were. it could be Evigishki Gustkraken but im not 100% positive
I think it's Noellia. The hair looks different, but that one long bang down the center is still there, and the hair is long enough for Noellia's hairdo (it wouldn't make sense to have your done like that in the hotspring anyways).