Nation A and Nation B have been going out for a while- although other nations think they’re in a relationship, no one really knows for sure. For some reason, Nation B gets amnesia and can’t remember anything about Nation A (or anyone else for the most part). Cue Nation A trying to get Nation B to remember themselves and get Nation B to refall in love with Nation A. Can be filled in AUverse if filler can make it work, otherwise it’d be prefered if this stayed in canonverse. Fems are welcome as is smut
Bonus One: Filled with a pair of nations that have (historically or otherwise) know each other for a long time. (As in since childhood)
Bonus Two: Filled with Franada (Canada asking who everyone is instead of the opposite amuses OP) or DenNor (OTP+UST+Lots of history)