The world is an infinite Tree, so everyone needed wings or claws. The people had wings. The beasts had claws. Miyako had neither.
And she Fell: down the Precipice, away and further yet away from the bottommost civilization, because of a winged bully's prank gone wrong.
Accompanied only by the mysterious immortal raven Kotengu, Miyako resolved to herself that she would make things right. If they allowed her to Fall, then maybe they wouldn't mind if she returned the favor.
Maybe, this time, she could finally cry.