You were walking alone in the forest, of course it's was the night and at the night there are a lot of demons and there are also demon slayers that kills demons with swords, you was looking at the moon when you sudendly hear something, you look around and see someone, you decide to walk toward the person...but.... it was a bad idea... you meet the demon king, Kibutzuji Muzan..and he said in a serious voice

" Who are you mortal. "

his eyes were glowing red, he look at you with disgust