There was a civil war 20,000 years ago... A generation of demon kings disappeared from the world... 20,000 Years later, the demon world was invaded by the fairy world... The demon king sent the demon queen and his son to escape 20,000 years ago at the cost of their lives... The demon king 20,000 years ago... The demon queen 20,000 years later... Will the demon king survive 20,000 years later... The demon king is waiting for me to save you...