Work Text:
in a temple somewhere of heian era a doctor was force to treat a demon in that time this demon wanted to walk in daylight to have the perfect body, and he will do anything to get it, this doctor, due to not like his hostage situation, "hurry up dr. Frankenstein my patient grows thin." said the demon king, "almost done with the elixir my lord." said dr. Frankenstein. had been creating elixirs out of three different colors of spider lily, each non tested "these should help give you the perfect body." the doctor added. "in theory these could bring to a new immortality." said the doctor, "finished i suggest you need to take.."
before the doctor walk toward the demon king with the cup on trey, the demon snatch all out of the tray as he chugged them each. before the doctor could finish is sentence, "one..." at first the demon king felt nothing then he started swell up bubbling warts this is when her exploded as blood splatter all over. "oh lord am i free?" Frankenstein asked himself. only for the blood to gather to two pile as it started to formed. one an elegant woman with a black takuta and long hair. the other the demon king as he spit out the elixir of spider lily.
"attempt to kill me, you will pay for that." growled the demon king, "no!" cried the the women as she tranfrormed to a dragon of black and breath fire onto the demon king, turning muzan to crisp. then she took doctor Frankenstein and fly out the temple. the studies the work all of it burn to ashes by the black dragon women the demon king scream at the top of the lungs, as the temple broke down to rubble with the ceiling and roof fall on top of him. Frankenstein was carried by this dragon turned women to another place.
it where four color of spider lily had grew all over the place. the dragon turn back to an elegant women with a black takuta, as she place place the doctor in the ground. "thank you for freeing me..." "no thank you for splitting me apart from that horrific man." said the women. "so it seem my elixir when combine had split the demon king to two beings." said frankenstein. "all my research i need to keep it safe." said the doctor. "but your work is gone in the flame." said the elegant women. "yes but i have it in here." said frankeinstiens pointing his head.
"you need a name and since your born from muzan essence how about mulan kibutsuji." said frankenstien. "mulan to counter muzan, kibutsuji against kibutsuji hence forth i will claim the name. mulan kibutsuji." said the elegent women in black takuta, as "good i going to write down my research and teach you my work." said frankenstien. as this begin planning of keeping the work alive and with that mulan was taught on all three the elixir. and while they planning against the demon king, mulan fought against her demonic brother.
beginning the build of four kingdom, mulan gather people and offer them either her blood or an elixir made out the red spider lily creating not her monsters, her kin but instead angelic being... tenshi or angels from those who were wronged in their lives who suffered from the cruelty that the eastern japanese society and tyrannical people. she will give them a choices those who are in dire need to be angels.
hakuji was one who suffered from a cruel people and leader ship, but when mulan came to offer him two choice and the chance to bring back his love one from the dead, thus he became hakuji become a monster, and his wife koyuki also a monster, gyatoro and umei are two other people who suffered from a samurai and the people of their village, this is when mulan came to them and did the same offer them a choice thus umei and gyatoro become angels,
one time mulan met a swordmen yoriichi tsugikuni and begin to fight under a miss understanding, this is when muzan arrived with a demon enslave to his will, seeing this the monster queen attack muzan, as it got yorrichi to question mulan, till he come to realize she is not the enemy thus from the fight between the monster queen and the demon king, yorrichi join the fight, against muzan, as he perform a technique of hinokami kagura onto muzan.
cutting the demon king to peace's, and mulan the queen of monster turn to a dragon and burn the peace to ash. it seem muzan was almost dead, one unburned peace fled away to elsewhere, as the women who once enslave was breaking free, mulan was quick to ack shifting back to her humanoid form as she eject the women with the angel elixir stronger then muzan demon blood. as the lady sprouted wings of gold. "there your free" said mulan. the lady broke tears.
"thank you queen kibutsuji." said the lady. "thank this man as well he gave me an opening." said mulan. "thank you brave swordman" said the lady. this is when thing take a sharp turn though yoriichi did not kill the demon king he told the demon slayer corp of the queen of monster and a demon turning to an angel, but still he was cast out the demon slayer corp, but met with mulan while he was returning home.
only to see the queen of monster just kill a demon who attack the kamados family who live in his home, during their conversation with the kamado it was here the hinokami kagura was shown not to the kamados but to mulan. from that on yoriichi give his hanufuda earing to the kamado mulan offer yorrichi a way to bring back his love one he lost.but yoriichi reject on the offer then leave. not knowing he just pass down his sun breathing to mulan and the kamado.
this lead to an alternate route where mulan make her leave as bidding the kamado farewell, once returning to frankenstien she begin learning her lesson on the four spider lily, the black spider lily is use to create monster, and the red use to create angels, from this the blue spider lily elixir was not use to create demons or at all, the doctor that use it was kill. with along with his knowledge of the drug. the white is never use but rumor to create god though never use,
many years pass muzan been spreading his blood to countless people turning them to demons, as well as killing and eating people, the monster queen been reviving those who died by demon hands, to angels to monsters and when its, in mist mulan found yoriichi again, as he begin to fight his brother michikatsu who is now a demon, but still manage to win. in the mist of the dual the now demon machikatsu with his demon art now swoop and slash yorichi,
mulan anger roared as she took form of a dragon attempt to breath fire at the the demon this time altering fate to a new not death but the scarred for life, machikatsu or now know as kokushibu had broken free from muzan curse and fall back for the time being, yoriichi lifeless body was given the white spider lily elixir and the result .... was divine, as his youth return his limbs grew back his eyes show white slate no iris or pupil.... it confirmed it he was a god now.
this begin an great change of turns for the tsugikuni brother, yoriichi and now named kokushibo, as through generation pass, the rumor of demons, gods, monsters, angels all that was in rumor and common one at that this was when things started to change for humanity. one night in a village, mulan kibustuji was working on a project she did a bit of grave robbery of certain demon slayers limbs and body parts of different kids in different age were stitched together.
then she eject the black spider lily drug and the stitch together body begin to morphed and take new shape
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a young man wanted to play the story mode of a video game he had been skipping some scene but he accidentally finish the game and skip the whole scene of it now he wants to see the whole story in new game plus though he did not do the side mission it was a second though he skip again now now he need to do it a third time once he press new game plus a flash of light shine from the steam deck engulf the room as he fall the next thing he know he woke up lying in a bed too fancy feeling strange. "it work the black spider lily." said the women, she was wearing a black kimono, as her face was oddly beautiful, "greeting son." said "son? who the hell are you!" shouted the young man siting up right in a rush.
"i am your mother child!" scolded the women. "though this was done with a body and black spider lily." said the woman. the young man looked around to see where he was. realizing he was at the inside castles like structure similar to a game he play with vampires werewolf and other monsters. "am i in demon slayer?" asked the young man. "no your not in the demon slayer base but my omnipotent castle." the women answered with a smile sitting on her knees.
"wait you look like a character i seen muzan kibutsuji?." said the young man. "Mulan i am her sister." the woman told her. "wait he does not have a sister." said the young man. "not until a black spider lily was used to create a drug on him." said the women. i use that same drug to bring you to this world."
"okay this got to be some dream i was waiting for the video game to come out when suddenly a flash of light engulf me and next thing i know i am in the anime world of kimetsu no yaiba only to discover it an alternative version of it." said the young man still upset he did not get to play his new game
"sorry i don't know what your talking about" Mulan told the man seeing the shifted in the room as it shook. as peter wonder where he is he realize it was that of that one anime. but it was shaking like crazy "wait am i in demon slayer universe oh no i like the canon events." said the young man wanting to know if he got isekai.
"how do You know what demon slayer are?" Ask Mulan. "the bigger question my queen is how does he know of muzan?." said a women with angelic wings her uniform seem to be that of demon slayer corp "yeah how do you know about muzan?" the young man begin thinking that this is some twisted dream or some sort he sigh as he begin to answer clearly.
"i am from another world where all this was two things, a game and a entertainment display called anime, also a picture book called manga, and for how i know of muzan and demon slayers, i watch or seen it in this anime and raid manga of a boy name tanjiro kamado who goes on a journey to cure her sister from her demonize state." with the young man words it mulan thought he was playing a trick but she see he was not lies.
she see him as delusional. "but seem when i got isekai or 'recreated', thing drastically changed." said the young man "well there is one changed muzan created a drug out a black spider lily. once he eject himself with it, i was born out his female form splitting off his body. by this splitting, i become the first monster in this world and live over nine hundred years." said mulan.
"that different from what i seen and raid in the anime and manga." said the young man. "if this isekai is real then i may asked what was your original name." asked mulan. the young man stay silent to think should her give out his original name. "if you don't want to tell me how, would you like a new name for your new life." asked mulan.
the young man had thought of it this might be a dream or it might be real. if it is real, it would make sense to get a new name for this isekai life. therefore he decide. "yes the name, peter." said peter. "very well peter kibutsuji it is." mulan told him as she she stood up to walking to the balcony peter follow as the two look at the sky above the castle.
"you seem to be odd minded son get some rest and maybe be well in the morning." said mulan as she look at peter and then smile. she walks toward inside the room as she head toward the door, "if what you said is true then let me be the first to say welcome to the alter my son." she open as her servant come with her once left the room she then close it behind her.
she walked down the hall to when her servant begin to ask. "master do you really believe what he said is true." asked the women. "kanae he might be delusional the side effect of creating monster out of fetus or corps do might result with those imaginative thoughts, then again if he is truly isekai then i have to help him adjust to this world he is stuck in." said mulan.
"if you wanted a son so badly why not reproduce one with a human." said kanae. "monster might not be capable of making kids as human do." said mulan. "and why this way you wanted to asked, becuase i wanted too." said mulan. "very well your majesty." said kanae. back in the room peter begin to lie down on a bed he look around "maybe this is some wierd dream." said peter. "if so i be back playing digimon in the morning." said peter as then he pull the blanket on him. and head to sleep
the next day he woke up to see himself in bed and in the castle it was morning. "it was not a dream after all." said peter realize the whole thing was not a dream but with a small alter of the demon slayer universe. he felt the ground shook with a earth rumbling sound. arriving at the door was his mother. "moring sleep well peter." asked mulan. "yes but realize this aint a dream its real i have been isekai." said peter, getting out of bed.
at first mulan assume her son to be delusional, but now she seem to believe him. "okay lets get you ready maiden." said mulan as she clap her hands together. kanae arrived with new clothing it was seem to be a coat with slack pants and a silver t-shirt. peter got of the bed "thank you kanae was it?" he asked. "did you know of me from this anime you speak of." asked the women. "yes." said peter confirmed his claim. "i see..." said kanae. "we shall wait in the dinner hall." said mulan. "come lady kanae." she ordered. then the two left.
and with the quick changed of cloth peter head out the room to see a pure white women with white hair in a spider web kimono. "follow me prince." said the women as then they head toward, the dining hall where a large table with an entire buffet of food lye on the table and sitting in the table was mulan and lady kanae. peter went to take a seat as he was serve a course of meal, this was the moment they begin to eat. peter tried his best to eat in a well manner way. seem they don't mind him eat normally, so peter eat normally.
once done kanae escorted him through the castle till they reach the outside part of the mobile castle. this is when peter was taken out the castle door in a wall of a building and into see a town. that he walk right into to seeing the town from and realize the era was taisho era japan so might be a dream come true to most retard but he know how strict is japan is on human rights.
yes this is bad era to be in for it not just with man eating demons but laws that is all sort of wrong, "this way my prince." said kanae as she took lead peter follow the former hashira to across the town people look how oddly he dress trench jacket with a black sweat pants and white t-shirt most of all the goggle on his head had made him stand out.
"meh if this made me wierd so be it." said peter as he walk pass a far away bridge this is when he notice something the person in pink hair with a man in glasses he could not help but listen, "kanroji," the girl look at the guy in glasses. "only a boar or a bear or a bull, would marry you," from the guy in glasses insulted the pink hair girl, peter greeted his teeth. "thinking of your pink hair passing on to my children, give me shiver," said the guy in glasses. "and forget about me goodb- peter rush in to deliver a heavy punch to the guy in glasses as his feet move on his own.
"how dare you insult such a passionate lovely lady such as her." snapped peter. but action spoken loud enough to see the man was bleeding a bit. lying on the floor groaning in pain. "oh shit did i almost kill that guy?" asked peter "you stood up to him for me?" said the girl in pink hair and kimono, his mouth open as words come out before thinking. "i don't know why, my body move on its own my word spoke out of mind, but when i saw this i got angry, i cant let a strong beautiful women get insulted like that any good man would be happy with you i know i would.." peter's words hit the girl hard.
as the man in glasses stood up "what want to marry her fine, take her hope you can feed her apatite." said the man in glasses. as he left. "my prince!" kanae. called peter. "hey kanae sorry it got out of your sight." said peter "your majesty were just here to investigate the sighting of your monster kin in this town. not to harm humans." kanae then took a look at the pink hair girl in a kimono. "seem you expose our kin to a human." said kanae "we'll make hase to our duty to our kin. as of now human please keep us secret." said kanae.
she sprout her wings and took flight not much seen her fly by just mistaking her for a type firework. "please find someone better then him mitsuri kanroji." said peter as he bowed to her. the women with pink hair was surprise as peter begin to leave. "wait how'd you- peter made some nice distance as he was far gone,
~~~~
"know my name?" the pink hair women finished her words. she begin returning to her home to her family a shift in her life had occurred one thing for sure it done by a strange dressed man knocking the stuffing out of her fiancée and how did he know her name, where did he come from and was that girl a angel with him. she called that strange man, her princes and your majesty, one thing for sure thing in her life will never be the same. once arrived to her house her parents were about to celebrate, when they notice they see her with no husband.
"mitsuri what happen?" asked her mother miss knoroji, "oh bomi turn me down then something amazing happen, this weirdly dress man came and stood up for me." said mitsuri told her parents. "weirdly ...dress.. man?" asked mister kanroji. "he had golden goggle black hair with sweat pants and trench coat to match. with a silver white shirt." once mitsuri describe the dressing of the man. "wait was he with some sort of winged girl?" asked misses kanroji. "yes how much you know of him?" asked misturi. "well know they looking for a monster."
"a monster? not a demon?" mister kanroji responded. there were rumor of demons and demon slayers but this was entirely new mitsuri felt she had to look for this oddly dress man. this got them questioning well just her questioning are there other non human race other then demons? for some odd unnatural reason mitsuri cannot get that odd dress man off her head this was the becoming the change in her life, it was later late at night the pink hair girl look up in the ceiling of her home then got up. "i got to see that man again." said mitsuri.
she gotten dress that night ass she sneak out of the house and went toward through her town she look for any sign of a monsters any monsters for sure she wanted to see him again but why what the reason she desire to search for this prince with the winged girl. she went to an allyway and found a castle gate standing in the corner of the wall. "what is - then a monstrous roar was heard as well a scream the roar seem animal yet and unearthly to nature of the human word.
mitsuri rush toward after the sound ignoring the castle gate in the corner wall of the ally way leaving town to find an open plain where a dragon of black standing before her, the dragon look at mitsuri startle as he spoke. "mitsuri!?" said the dragon. but remember what peter said that he was a monster, could he be a dragon. "peter?" responded mitsuri. this lead them to new start on their relationship.