Well, if not her, guess the only one it could be really is Kaguya. I mean, Kaguya really is the one with whom Mokou can spent the rest of her life with. It would be sad if the wedding idea was just a joke at first, but again they can still marry even then.
Once again...So is it true that Mokou's getting married, Kaguya?You don't have to finish! I understand!Counselor 2Umm, Keine, the truth is that-I wish you and Mokou an eternal life of happiness...!Why are you asking me?Ah, but the news didn't write who the other person is.So this is what she meant by she's busy recently.Ah...Wai-... Why am I the one getting married to her?!