So... one of the other girls will accompany and guide the family around?
I can see a battle royale for the "I can introduce myself to my future in-laws" role...
Yuri might be the one ending up doing it. Or it could be chosen by rank as well and the 4th ranked girl (which could also be Yuri as we don't know her rank) will be tasked with that job. A-ko would be out then (she's rank 12)... but it wasn't even written that the guide will be from class 2-E either, so she could be from another class.
I can also see Ruri planning to volunteer and take revenge that way... well, but if guards from another class are allowed, I am betting that Kaede steps up as well - she went for the exchange first, so she could clearly try and pull such a stunt.