In the summer of 1980, an explosive event hurtles eighteen-year-old Sarah Qin into the ethereal realm of Bataria, where good souls are transformed into human-sized bat spirits and are tested to be allowed into a utopian city called Valle Oroia, the Gold Valley. Bataria is an immense spirit realm containing both the utopian Valle Oroia for good souls, and the barren hell desert of Griseo Vastum, the Grey Wasteland, where evil souls stripped of their wings and demoted to rats. Sarah's ultimate destination results from her actions to these brilliant and terrifying events.