
Arrietty taking a liking to the fairy as a girl of similar age and height, but with magic and the ability to fly, filled with a ton of survival and wildlife knowledge, meanwhile Crysta taking a liking to Arrietty being from the town of man even if she spent a large amount of it hiding from the humans.
Of course, being a 'Not' Fairy, Arrietty is still vulnerable to living danger, but luckily since Crysta is a respected fairy, she can bail the Japanese girl out of danger at a moments notice.