well, Sharena, when sent to greet, says "oh, another Askran kingdom........ how is the me here?" something like that, so I imagine they will react positively.
I'm assuming that they will 'mysteriously disappear' and then Anna and the Summoner will find them as bunnies with the other two, and then they'll rejoin us after the Festival.
Pokemon GO
Fire Emblem Heroes
Fate Grand Order
Dragonball Legends
Dragalia Lost
IV Calc
Heroes