Instead of theorizing about who would win or survive in the modern world (which obviously modern humans would win), I would be more interested in the Girls' reaction to the modern world. To think about how their ways of thinking would directly clash with the modern world.
How Regina would see the extreme logging of forests, resurrecting extinct animals or what would completely traumatize her, how chicken nuggets and factories are created that would leave Timfale as a village.
Licalys and Virindise's way of thinking of having sex indiscriminately, when it is already frowned upon here.
Elliete to see how people question their own faith when they do not know their origin or see how this world does not present deities in sight. (I did not know how to express this idea but I tried to present it as well as possible).
Yakuu seeing a country similar to her home region, or seeing how people so pathetic to her would literally create a giant-killing weapon with something so small for its size (obviously referring to the atomic bomb).
Croixille with racism between humans just because of skin difference.
but for me, Naya could very well act like this:
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Madea: Naya. Those things coming towards us, I don't think they are edible.
Naya: Stop worrying. don't you see they are like little birds heading towards this big kitty, listen, they even make a funny hissing sound. just let me taste them just once so you can see I'm right.
Naya receiving a flock of missiles after opening her mouth.
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