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"Hey, do you know the Demon Kings of fairy-tale worlds? Their fate is to die at the hands of heroes."
Whether they try hard or not, Demon Kings are doomed to die in their own castles.
Whether they're kind or not, Demon Kings have no right to save anyone else.
Whether they're powerful or not, Demon Kings can never defeat a weak hero.
"Hey, that's what the Demon Kings of fairy-tale worlds are like. Their fate is to die at the hands of heroes."