Oyadori no Ko

It’s widely known among Devil followers. Once upon a time, there was a girl possessed by the Demon. Although the Demon was expelled from her body after that, its words left. "There have to be 9 people offering to the Devil every year on the full moon night. If anyone survives 3 days after being offered to the Devil, the Devil will be back to this world. The Devil will grant this world happiness and freedom.