Let's walk the path of Hyakki Yako, Parade of The Hundred Demons, through the creator's eyes. This Pandemonium will tell you their stories before the fall, how good became wicked.
#1 Mother of the Reborn
"Can I burn them all, mama?
All they know is hate, they turn against their own kind, selfish beings.
They deserve to be turned to ashes, return to the land of Death.
I will make them reborn and pure again."