The Demon King & The Prophesied Girl

The Demon King, Dimitri Rae the most dangerous and brutal demon you could ever come across has been ruling over Rovana for a very long time. Life tends to get boring so Dimitri results to torturing and killing humans as a form of entertainment. This has been going on for more than a century and the humans are too weak to fight back. A prophecy states that The Demon King can be stopped by one thing and one thing only. A girl who will be eighteen years of age when she meets the King. The prophecy doesn't state how she will stop him, just that the demon King can be stopped. So every year, the humans send twenty girls who are eighteen years of age, down to Rovana, hoping one of them will be able to kill him.