Tsuru no Ongaeshi

The tale of Tsuru no Onagaeshi and her ability to transform from a crane into a human is similar to other world myths about divine creatures that can do so. It seems to be a similar formula; the animal transforms into a human (mostly female), has strange peculiar habits, falls ill most of the time, and always produces an object that becomes a source of wealth for the person they marry.
Though not visible, this doll has some spotting on her face which suits her character fine as the crane maiden always has an illness of some sort. One could suspect from a mythological perspective that a divine entity and the source of it's immortal power can only be contained so long in a vessel of flesh. It seems to be an inevitable consequence, they want the flesh and to walk amongst mortals, then they will experience everything that comes with it. Sickness, pain, weakness, and other vulnerabilities that degrade the flesh come with the price. In a corporeal form does the divine experience the full extent of love and hate; happiness, bliss, ecstasy, sorrow, sadness, anger, passion, and importantly regret.
Though one would think that these tales would be a lesson for mortals, if anything I think the moral lesson is to be also learned by these divine beings. Be of the flesh, experience the consequences of the flesh and all that comes with the mortal experience. That is the gist of what I take away from such legends.....