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This was supposed to be a romcom! Just how did this turn into a drama!? by Happypeppyreader
Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga)
25 Jan 2026
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Summary
Narnia Naberius has a clear objective: get access to the human child hiding in plain sight at Babyls. It is an affront to reality, that an insignificant, weak being has gone undetected for so long AND was actively concealed by high ranking demons on top of it! Hence he can’t just barge in and sink his teeth into his prey. No, he has to go a more delicate route about it. How to get around the Guard Dog, who guards his charges diligently? You distract him with a more pressing issue…
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Nocturnal Blossoms and Spectral Violets by ibi909
Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime), 原神 | Genshin Impact (Video Game)
25 Jan 2026
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To try and explain, this is a fanfic based on both Mairimashita! Iruma-Kun (Osamu Nishi) and Genshin Impact (Hoyoverse). I'll explain more in the first chapter, but maybe try it out and see if you like it?
You don't need to know how both worlds work as I'll try my best to explain it all in the fic!
(This is an OC insert fanfic, and there will be changes to the main plots of both Mairimashita! Iruma-Kun and Genshin Impact.)
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The Lost Puppy by Zlatik_art_noname
Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime)
24 Jan 2026
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I don't think I'll write much, it's a work doomed to be abandoned – I'm so sorry
Iruma is half demon. He discovers this by accident, and reality refuses to spare him. The spiral is spinning too fast and events are gaining momentum.
Series
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Welcome To Vampire School! Iruma-kun by Agaap_pilled
Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime)
24 Jan 2026
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Summary
Iruma Suzuki, an unfortunate 14 year old boy with crummy parents finds himself lost. But, when he helps an old, near dying vampire, he suddenly finds himself in quite the prediciment. He's become the vampires grandon! How could this have happened, and what's worse is that he has to live knowing if others find out his secret, he's dead (literally)
Or
A Welcome To Demon School! Iruma-kun vampire AU!
Series
- Part 1 of Vampire AU
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In The Name of "Love" by Agaap_pilled
Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime)
24 Jan 2026
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Summary
Eiko Oni, a new student at Babyls already finds herself head over heels for Iruma. But, what happened when she feels like others are going to steal HER Iruma.
Or
Yandere!Eiko with a side of IruEiko and AmeEiko
Series
- Part 1 of Yandere AU
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Half Demon by DekuNo
Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime)
24 Jan 2026
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Summary
“I’m pregnant.”
The words were like a spear through the chest. “What?”
“I’m carrying a demon child.”
Kalego sat up, head spinning. “That shouldn’t be possible.” They were entirely different species after all.
“And yet, it is.”
Or: Iruma’s mom summoned Kalego as her familiar first and Iruma is Kalego’s son—a half-human, half-demon cambion. 15 years later and Kalego never thought he’d get the chance to meet him until a certain blue haired boy gave a speech at the Babyls opening ceremony.
Series
- Part 1 of Half Demon
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It's a love story, baby just say yes! by tiny_as_a_firefly for jnhcv
Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime)
23 Jan 2026
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After graduating, the soulmate trio continues to hangout and spend time together, despite all the new responsibilities each of them have. Especially with Iruma as the demon king and (finally) dating Ameri. But Clara finds out a secret Iruma has been keeping! When she confronts Iruma, she learns what he had been hiding, all she needs to do now is figure out how to help him out.
UPDATE:
THIS FIC IS COMPLETED!! -
Role of a Guard Dog by sn_sp6
Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga)
23 Jan 2026
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Summary
Naberius Kalego just wanted a peaceful break before he had to go teach his very abnormal class… Then Iruma appeared.
Next thing he knew, everything seemed groggy and was blacking out.
Then he woke up without any idea who he was, except that he was a blue-haired boy’s familiar.
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Or: an amnesia fic with our favourite demon teacher as the victim
Edit: Tags may be added as we continue!
Series
- Part 1 of iruma army
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A Real Reason. by Chix_pii
Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime)
22 Jan 2026
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Summary
Evidols Lindy and Beeber coincidentally meet at a festival where Lindy gives Beeber a few words of advice.
Idk it's just a story of Beeber liking Lindy and stuff.
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The Ground We Walk On. by GarnetJPH
Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime)
22 Jan 2026
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Summary
“Iruma,” Kalego said firmly as he grabbed the boy’s wrist to stop him from running any further, “I need you to answer me truthfully. You’re not in any trouble, so take a deep breath,” His voice was uncharacteristically gentle as he slowly guided Iruma back to the couch. Once Iruma was sat, Kalego crouched down and gently held his hands, “Iruma,” He said quietly, “Who grounded you?”
The teenager blinked in surprise at Kalego’s words. Grounded? He looked around at all the other teachers, expecting them all to be staring at him like he was a buffet waiting to be eaten. Instead, they all stared back at him with pity and horror written all over his face. He slowly turned his attention back to Kalego, who was patiently waiting for an answer.
“Excuse me,” Iruma whispered, his heart still hammering in his chest, “W-what…What is grounding?” He asked.
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What if Iruma is removed from Sullivan's custody and put in the care of his grumpy homeroom teacher and the teacher who supposedly experiments on students? How will Iruma continue to hide the fact that he's human while also making his teachers understand he wasn't tortured?
[AKA: Grounding fic make brain go brrrrrrrr]
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People Change!....Wait they can change that much?! by Crazy_Cockatoo
Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga)
19 Jan 2026
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Summary
Iruma Suzuki is doing.... fine after the whole museum facade spending time with his friends will help his mild depression and bad aches right?
OR
Yall be more careful with blood....
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Wanted to try my hand at a demon blood fic and wow...
What have I made. -
Chaos with the misfits and co. by Agaap_pilled
Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime)
19 Jan 2026
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Summary
Chaos.
No set schedule with this, I'll update it whenever!
Series
- Part 1 of The Mishmash Mairuma collection
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Red String(s) of Fate by Meeparino
Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga)
19 Jan 2026
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Summary
Clara hums melodically, “Red Strings of Fate~ ♫ Soulmates! ⋆｡♪ Lovers dancing under starry moonlight! ₊˚♬”
Iruma scrunched her eyebrows even further, “Soulmates?” Iruma questioned. Clara tilted her head in confusion, “You don’t know what soulmates are, Iruma-chi?” Clara asked in wonder.
“Clara, don’t be rude! Not everyone is in a rush to know their partner so early in life!” Asmodeus retorted.
Iruma, of course, knows about soulmates! He’d worked with an author before– this troupe is usually used in fiction– but for it to actually exist… He cannot believe it! Well… The more that Iruma thinks about it, the more clarity it dawns upon him: Demons are also considered myths, or in other terms, fiction in the human world! And here they are sitting next to him. So, why should he be surprised that soulmates exist?
=
Or my take on red strings of fate!
Will add tags if I decide to add more chapters with different pairings (No promises)Chapter 1: Love trio (True pairing) - Hurt/Comfort. Mainly Iruma's POV
Series
- Part 1 of Soulmates AU
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The Lilith Prophecy by vixennj
Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime)
16 Jan 2026
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The sixth incarnation of Lilith, abandoned by her clan, was taken in and raised by Sullivan. She sets off to study at Babyls Demon School—and will later teach there—facing love, rivalries, and other unexpected conflicts.
Suitors from all corners of the Netherworld compete for her heart, but her true challenge lies in fulfilling the Lilith Prophecy.
Featuring Kalego Naberius x OC, inspired by the Music Festival Arc: Lilith’s Red Carpet.
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Flightless boy by Alittlwweirdo
Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime)
16 Jan 2026
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Summary
What was meant to be a normal day, atleast by Iruma's standards, got turned completely upside down.
And all because of Balam's touchy habit.
Expecting to be eaten the moment he was discovered, he instead got horrified looks, and one question stood out, which resurfaced horrific memories.
(Grounded Iruma AU but he also had horns)
"Just stay still for me, okay Iruma? You're such a good boy!"
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Bluejay and the Bats by XxMelon_puddlingxX
Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime), Batman - All Media Types
15 Jan 2026
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Summary
Bruce rarely goes on work trips, as Bruce Wayne. But as Batman he goes on plenty. So when a work trip came up to go to Japan he thought he would skip out on this one like he did all the others, but something felt like it was calling to him. So he did something out of character and went. It was a trip to check up on the Japanese branch of Wayne Enterprises. Bruce has been to Japan before, it was as Batman so he had to act like he’s never been here. So to keep up appearances Bruce wandered around to the city, soon coming up to one of many forests in the area. It was there he saw something out of the ordinary, a blue haired child that couldn’t be more than 6.
The Child's name is Iruma.
(An AU where Iruma Suzuki is raised by Bruce Wayne at a young age and as the youngest child. Thus, changing multiple things.
I'm still bad at summaries.)
Series
- Part 1 of Batfam unique crossovers
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metamorphosis. by El_The_Abberation
Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga)
13 Jan 2026
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Summary
Against his better judgement, Iruma meets up with Kiriwo and ends up getting drenched with a strange potion.
Things start going downhill from there.
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A personality swap fic but start it off bordering on crack and gradually devolve into angst -
A New Start: The Beginning of a Beautiful Life! by SleepyLilacFox
Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime)
12 Jan 2026
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Fanfic for Welcome to Demon School Iruma-kun! Gender-bent, half demoness- Irumi!
This teen is no other than Irumi Suzuki. Why is this young teen here in the first place? Well, poor misfortunate Irumi was raised by two horrible excuses of adults. They were selfish with their only goal was to have a comfortable, lazy life. Even if it meant forcing their child to shoulder all the consequences. And those consequences have been steep! But no matter how much the young girl has tried, has worked, or sacrificed herself. It was never enough for those selfish humans. And in the end, they sold her. Not to any mortal man, no but to the great devil, Sullivan. Within this new, strange and foreign land- how will she adapt and stand up to these new obstacles in her life? And is this all in the turn for the better? How is it now that she is learning all this stuff???Series
- Part 1 of New Beginnings
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Day 7: Anniversary. Two Celebrations. by Xime444
Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime)
10 Jan 2026
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After the music festival, Iruma plans heartfelt gifts for his friends—but Asmodeus’s is different. A simple framed memory turns into a quiet confession, and what begins as friendship gently shifts into something warmer, marking the start of a love they hadn’t dared to name before.
Series
- Part 7 of Fluffuary2026
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A missing piece for a puzzle by Barbeque11
Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime)
09 Jan 2026
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Balam Schichiro and Naberius Kalego were powerful demons who wanted to become a proper parents. However, due to some things, it wasn't that easy for them. They've been looking for a fledgling for a long time, but they haven't been successful at all. Will they be able to find their lost piece in the end?
Or: Two demons in love searching for the right pup until the universe decided to bring them one on a silver tray.