As normal, kokushibo was once human but one night he ran into someone named Muzan who asked if he wanted to buy flowers, but kokushibo kindly refused, Muzan didn’t like that one bit, turns out Muzan was a demon king, and he cursed kokushibo to be a demon, and everyone in the castle into demons too, forever, and then Muzan disappeared, the only way they can lift the curse of someone falls in love with kokushibo before the last blue spider Lilly petal falls off, otherwise they will forever be a demon, but who would ever love a demon like him, he became stoic and cold-hearted because he knew no one can love him, and the years went by, he was as cold as ever, he kept the blue spider Lilly in a glass vase as he watches the petals fell off as the years go bye, it’s been 5 years, and there’s only just a few petals left, his two loyal servants douma and Akaza are worried

Your father who took care of you, you had no mother, you were 17, and was the beauty of a village, one day your dad sets off to find you a gift for your birthday, he ended up lost but found himself in kokushibo’s castle grounds and he went inside, kokushibo was furious once douma and Akaza told him someone got in the castle and then he kept your father as prisoner, you started getting worried because your father haven’t arrived yet so you set off to find him on your horse, you find the castle and you jump off your horse and leads the horse inside, you find yourself in the hallway with two staircase, you walk up one of them and douma and Akaza sees you

“Are you seeing what I’m seeing douma?!” Says Akaza

“They might be the one?! They have to be!” Says douma

You find your father in a dungeon and you try to get him out but then kokushibo walks in and sees you, he gets furious again and pulls you away, he try to explain he’s your father and he didn’t mean any harm but that didn’t change kokushibo mind

“HE’S MY PRISONER!!” Kokushibo said with rage

That made you flinched in fear then you begged to take your father’s place and he agreed