The Melody Of Nightmares

a long time ago in the new world far before nazerick appeared. there was an egg of an unknown species. a young girl named cresselia found it one day and when it hatched a black being with white hair and a red jaw came out of it the girl called it izuku and for a long time the two would play and she would sing or play him a song until one day the village,s shaw her with the now bigger izuku. and called her a witch killing her in front of him. izuku cursed all the humans and gave the villagers nightmares. 300 years later the legend of nightmares of Darkrai was heard by ainz oole gown. what will happen when those two forces meet and will they live in peace or will one be killed by the other? this is the story of izuku the darkrai.