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12 stories
Iruma-kun older sister ♡ by Lunalotusa
Lunalotusa
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hizuki shoku a 15-year-old girl has been isekai into Mairimashita-iruma kun by truck-kun. When opening her eyes she was a 7-year-old child in an abandoned house. read more to find out what happened and how she met our main character iruma and became his older sister plus see if she will have any love interest(s). ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Warning English, is not my first language Grammar mistakes will happen often I'll be following the manga instead of the anime. Released in Aug 2022.
that time I got reincarnated as iruma's twin sister!? (but as a female rimuru?) by Elyzzamae15
Elyzzamae15
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This story is about a kind and mysterious girl that died in our world by the one and only truck kun... Where she meet two gods... the god of reincarnation and power and goddess of wish and beauty... Both gods where sad for her death.. But because she's the first person that didn't judge and got mad at them ...they give her a gift....and they let her choose where she want to be reincarnated in but wait What if she becomes iruma's twin sister but as....rimuru!? In this au: iruma and rimuru are siblings and are also half human and half demons as their real father is delkira but got separated from him since birth due to an event that happens in the past when delkira first appear in the human world now they must face their journey together (Rimuru and iruma siblings au) (Soulmate au) Rimuru x ??? Iruma x Ameri family: father:delkira older sibling:rimuru younger sibling:iruma grandfather: sullivan secretary/servant: opera
WTDSIK x Harumi Suzuki  | Iruma's Big Sister | by Elyzzamae15
Elyzzamae15
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This story is about a kind and mysterious girl that died in our world by the one and only truck kun... Where she meet two gods... the god of reincarnation and power and goddess of wish and beauty... Both gods where sad for her death.. But because she's the first person that didn't judge and got mad at them ...they give her a gifts....and they let her choose where she want to be reincarnated in Let's join harumi in her journey in this new world filled with adventure and lots of fun interaction
Iruma Twin Sister by Mizuki_TheGamer
Mizuki_TheGamer
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I got some inspiration from one of the wattpad story "welcome to demon school fanfiction" I try to make my own story... I hope your guys like it.. This story goes like this... There was a girl who was born in the human world. Her father was the angel that fall from heaven as he was turn into a demon and her mother was a human but with witch power. Both her parents die when she was still young and start living all by herself until she was caught by the priest. After that her life change for the better when she teleport herself to demon world and meet with Iruma became...his twin sister? What happen next? Read the story if you want to know it... This is only a fanfiction...I do not own any of the character in this story accept for the hybrid girl ♡♡♡Well enjoy your reading♡♡♡
Into the Netherworld || Naberius Kalego x Reader Fanfiction by whosliyaa
whosliyaa
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Suzuki Hanako, a 23-year-old university student, found herself on a tuna fishing boat in the middle of the ocean, far from the typical summer vacation. She was working alongside her younger brother, Iruma, as part of a grueling job forced upon them by their parents' selfishness. Their parents, refusing to work and living off their children, had pushed Hanako and Iruma to labor for their survival. Hanako, though able to leave this life, stayed for her brother's sake, unwilling to abandon him to bear the burden alone. *** Mairimashita Iruma-kun is a series that belongs to Nishi Osamu This is a Welcome to Demon School Iruma-kun Fanfiction Naberius Kalego x OC(or Reader) Really liked the anime and manga. So I thought let's write a fanfic with my favourite character in it. It's my first time writing a fanfic, so it's not going to be perfect but I hope you liked it. Also it's probably going to be more of a slowburn/slow type of fanfic.
Just your Δνεгαςε Demon (Welcome to Demon School! Iruma-kun x Reader) by September_Gail
September_Gail
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Updates on Fridays [Book One] Y/n Naberius the adopted Daughter of Kalego Naberius.... Due to Kalego being busy with his Teacher work at Babyls.... Y/n get babysits from Opera due to their Senpai-kohai relationship... And owns the title as Sullivan's so-called-daughter.... What might happen if Y/n meets Iruma? The adopted human Grandson of Sullivan.... Will they be friends? Or be enemies? Let us read more about the future adventures of both Y/n and Iruma! ========= Disclaimer: I do not own Mairimashita! Iruma-kun! him mjn •~•~•~•~•~•~❤🌺❤~•~•~•~•~•~• Thank you @Hayami_Minato for making our beautiful book cover.
Hell's Greatest Danger (NaberiusKalego×F!Reader) by Marshieew
Marshieew
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I DO NOT CLAIM NOR OWN ANY OF THE CHARACTERS!! They all belong to the queen Osamu Nishi my favourite mangaka of all time <33 The ONLY thing I own in this fic is the drawings and the selfinsert oc I made. I DREW them MYSELF by HANDS so please don't trace my arts or I'll be very angry :3 Man I dunno what drove me to write this during new year.. Children pls keep away. Everyone under 16 bcs this thing is filled(a bit..maybe) with impurities. Keeping it short, Reader is Iruma's sister in this fic. Trying to survive with him in the Netherlands as a half demon. (before you judge, they're not related) Also trying to keep a distance from a certain demon teacher after enrolling in Babylys as some strange force keeps on pushing the two together. Notes: -CHILDREN SERIOUSLY KEEP AWAY PLEASE. I don't wanna be the reason someone lost their innocence- -Im a manga reader so there might be lots of spoilers if you're an anime watcher..(yes I read all those hundreds of chapters) -Contains smut with warnings ahead so proceed with caution. -Not an Age Gap relationship dw. -I know you're gay. Idk what's your issue for liking this zero blood flow dude but I love this man so much and if you do too then enjoy my new year nonsense
DEAR DEVIANT by hisokababe_4me
hisokababe_4me
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✨ Welcome to the Netherworld, where demons rule and one human girl will turn everything upside down. ✨ Y/N Suzuki, the twin sister of Iruma Suzuki, was dragged into the demon world alongside her brother. Sold by their neglectful parents, they find themselves adopted by the powerful Demon Lord Sullivan. While Iruma tries to blend in, Y/N? She's got fire in her heart, secrets of her own, and a strange pull toward the cold, enigmatic man forced to become her familiar-Kalego-sensei. This is a story of fate, identity, and forbidden bonds in a world where humans are feared... and love may be the ultimate rebellion. 💥 Slow-burn romance 💥 Jealousy, politics, and emotional twists 💥 Kalego x Reader | Iruma's Twin AU | Canon-Accurate Timeline Disclaimer: Mairimashita! Iruma-kun and all its characters (Iruma Suzuki, Kalego Naberius, Sullivan, Asmodeus Alice, Clara Valac, Ameri Azazel, Opera, etc.) are created by Osamu Nishi. I do not own the rights to the original series. This fanfiction is a transformative work made for fun, not profit.
A goddess at Babyls?!  (Extremely slow updates) by JustJinnie132123
JustJinnie132123
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Ji-Ji Suzuki, is a new teacher at Babyls. she's beautiful, strong, and can demand order in her classes. She is also, loud, brash and Iruma's older sister. Everything that Kalego despises. How will this dimension story unravel? Yo, author here. i cant write for shit so uh, ill take any critism cuz imma need it, last time i wrote anything was like 5+ years ago so heh. also like i get bad grades on this shit too so, grade me as well yall. I will be following the manga/anime, so if you havent read chapter 93+ or watched episode the end of season 2 (aka the 44th episode) then uh spoilers. also might use some japanese words, such as senpai and kouhai cuz idk the names of those in english without it sounding off. (The story is going to be rewritten.)
Watch Out demon school! Y/n Is coming thru! by FluffyCloudsKittens8
FluffyCloudsKittens8
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If you could live in a world filled with magic would you? Well that's what happened to our protagonists. Iruma Suzuki a hardworking and sweet boy as well as Y/n Suzuki a laid back actor, find themselves in this situation. So now the twins have to survive in a fantasy world. This may seem great at first but this world is filled with man eating demons who value power above everything. So can they survive in a world were humans are delicacies? Most characters in this story belong to the manga Mairimashita iruma kun made by Osamu Nishi.