Lord Sullivan (Mairimashita! Iruma-kun) - Works

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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)
08 Dec 2025
Tags
- Creator Chose Not To Use Archive Warnings
- Balam Shichiro/Naberius Kalego
- Balam Shichiro & Naberius Kalego & Opera
- Opera & Lord Sullivan (Mairimashita! Iruma-kun)
- Naberius Kalego & Suzuki Iruma
- Balam Shichiro & Suzuki Iruma
- Asmodeus Alice/Suzuki Iruma
- Balam Shichiro
- Naberius Kalego
- Opera (Mairimashita! Iruma-kun)
- Lord Sullivan (Mairimashita! Iruma-kun)
- Abnormal Class | Misfit Class (Mairimashita! Iruma-kun)
- Asmodeus Amaryllis
- Suzuki Iruma
- Suzuki Iruma's Parents
- Teachers of Babyls
- The Thirteen Crowns (Mairimashita! Iruma-kun)
- Alpha/Beta/Omega Dynamics
- Animal Instincts
- Cinnamon Roll Suzuki Iruma
- Hurt/Comfort
- Adoption
- Blood and Injury
- Panic Attacks
- Found Family
- Fluff
- Child Suzuki Iruma
- Parental Naberius Kalego
- Parental Balam Shichiro
- Other Additional Tags to Be Added
- Implied/Referenced Child Abuse
- Child Neglect
Summary

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.

Language:

English

Words:

13,993

Chapters:

6/?

Comments:

88

Kudos:

295

Bookmarks:

63

Hits:

3,165
Here we go again by blauji

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)
08 Dec 2025
Tags
- Creator Chose Not To Use Archive Warnings
- Bars Robin/Suzuki Iruma
- Suzuki Iruma
- Bars Robin
- Opera (Mairimashita! Iruma-kun)
- Lord Sullivan (Mairimashita! Iruma-kun)
- Barbatos Bachiko
- Angst
- Misunderstandings
- Fluff
- Mpreg | Male Pregnancy
- Married Couple
- Happy Ending
Summary

Iruma has been behaving strange and the people around him are worried. Robin falls due this into a panik.

Series
- Part 3 of Irumas and Robins family
Language:

English

Words:

1,065

Chapters:

1/1

Comments:

2

Kudos:

3

Hits:

69
Da(ddy)li Dantalion - "Your Name is Just Another Word For 'Dad'" by BadAssFemaleFighter

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)
08 Dec 2025
Tags
- Graphic Depictions Of Violence
- Dandalion Dali
- OC child
- Suzuki Iruma
- Lord Sullivan (Mairimashita! Iruma-kun)
- Naberius Kalego
- Balam Shichiro
- Morax Momonoki
- Opera (Mairimashita! Iruma-kun)
- Dali Becomes a Father
- Dali is Summoned
- Dali Adopts A Human
- Teachers of Babylus
- Demon Parent and Human Child
- References to Child Abuse
- Found Family
Summary

Dali Dantalion was about to consult Iruma on his quiz scores when he falls into a summoning circle. He returns with a human child in his arms. With the help of five demons and one human student, he slowly but surely becomes attached to the boy.

Series
- Part 7 of Iruma's Mishaps and Tender Moments in the Netherworld
Language:

English

Words:

2,517

Chapters:

1/?

Kudos:

10

Hits:

128
Bound by Fate - "Becoming a Demon's Bride" by BadAssFemaleFighter

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)
07 Dec 2025
Tags
- Graphic Depictions Of Violence
- Naberius Kalego/Original Female Character(s)
- Naberius Kalego
- Suzuki Iruma
- Original Female Character(s)
- Lord Sullivan (Mairimashita! Iruma-kun)
- Opera (Mairimashita! Iruma-kun)
- Balam Shichiro
- Babyls Staff (Mairimashita! Iruma-kun)
- dadlego
- Iruma has a loving mother
- Past Sexual Abuse
- Past Child Abuse
- Suzuki Asuna
- Strangers to Friends to Lovers
- Emotional Healing
- Shared Trauma
- Protective kalego
- Scars
- Kalego can't catch a break
- Iruma is a half-demon
- Family Fluff
- Pure Cuteness
- Parental Naberius Kalego
- Soft Naberius Kalego
Summary

Kalego never expected to be summoned by a human, or be forced to impregnate a woman who was in the same boat as him. Several months later, Kalego is reunited with his fellow prisoner who is just about to give birth. What follows is a series of obstacles as Naberius Kalego and Suzuki Asuna navigate parenthood and adjust to each other's lives in the Netherworld.

Language:

English

Words:

32,455

Chapters:

9/?

Comments:

44

Kudos:

319

Bookmarks:

83

Hits:

6,826
Life outside security by Enji_Kaiju

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)
07 Dec 2025
Tags
- Creator Chose Not To Use Archive Warnings
- Shichiro Balam/Naberius Kalego/Opera if you REALLY squint
- Balam Shichiro/Naberius Kalego
- Opera & Suzuki Iruma
- Lord Sullivan & Suzuki Iruma
- Opera (Mairimashita! Iruma-kun)
- Naberius Kalego
- Balam Shichiro
- Suzuki Iruma
- Lord Sullivan (Mairimashita! Iruma-kun)
- Bars Robin
- Babyls Staff (Mairimashita! Iruma-kun)
- Opera becomes Kalego's worst nightmare
- They/Them Pronouns For Opera (Mairimashita! Iruma-kun)
- Opera is rank Tet
- Because I thought it would be funny
- I Wrote This Instead of Sleeping
- The Author Regrets Everything
- The Author Regrets Nothing
- Opera has dyed hair
- fluff?
- Pregnancy
- Vomiting
- & is platonic BTW and / is romantic
- just in case you didn't know
- Probably Accidental OOC
- I lied you don't need to squint at all
Summary

Opera knew they felt off. So they went to see what was wrong, when they were hit with it. They were pregnant.

And not only that, they were put on leave from being a security devil.

So, while they waited for their child to come, they had to find out how to live outside of their usual work as a bodyguard.

Or

Opera becomes bored trying to figure out how to live like a normal person

Language:

English

Words:

5,591

Chapters:

5/?

Kudos:

3

Hits:

55
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)
07 Dec 2025
Tags
- Creator Chose Not To Use Archive Warnings
- Balam Shichiro/Naberius Kalego
- Naberius Kalego/Opera
- Balam Shichiro/Naberius Kalego/Opera
- Naberius Kalego & Naberius Narnia
- Abnormal Class | Misfit Class & Naberius Kalego
- Baal/Naberius Narnia
- Kalego & Other Charecters (M/F) one sided
- Naberius Kalego
- Naberius Narnia
- Balam Shichiro
- Opera (Mairimashita! Iruma-kun)
- Lord Sullivan (Mairimashita! Iruma-kun)
- Abnormal Class | Misfit Class (Mairimashita! Iruma-kun)
- Baal (Mairimashita! Iruma-kun)
- Teachers of Babyls
- Friendship/Love
- Asexuality
- Demisexuality
- Nonbinary Character
- Fluff and Humor
- Comfort
- Drama & Romance
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…

Language:

English

Words:

24,776

Chapters:

7/?

Comments:

15

Kudos:

41

Bookmarks:

8

Hits:

812
The Journey of the Throne: Life as a Male Omega in the Netherworld by Blue_2523

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)
06 Dec 2025
Tags
- Creator Chose Not To Use Archive Warnings
- Graphic Depictions Of Violence
- Naberius Kalego & Suzuki Iruma
- Naberius Kalego/Suzuki Iruma
- Asmodeus Alice & Suzuki Iruma & Valac Clara
- Suzuki Iruma
- Lord Sullivan (Mairimashita! Iruma-kun)
- Opera (Mairimashita! Iruma-kun)
- Balam Shichiro
- Morax Momonoki
- Barbatos Bachiko
- Bars Robin
- Raim (Mairimashita! Iruma-kun)
- Orias Oswell
- Murmur Tsumuru
- Ipos Ichou
- Ifrit Djinn Eito
- Marbas March
- Buer Blushenko
- Stolas Suzy
- Morax (Mairimashita! Iruma-kun)
- Past Child Abuse
- Child Abandonment
- Cinnamon Roll Suzuki Iruma
- Child Suzuki Iruma
- Bottom Suzuki Iruma
- Soft Naberius Kalego
- Tsundere Naberius Kalego
- Omega Suzuki Iruma
- Alpha/Beta/Omega Dynamics
Summary

The Suzu clan was the first to bear a child born of both human and demon blood. From that union came a new demon type known as the Omega. Unlike the brute strength of Alphas or the vast numbers of Betas, Omegas were different. They were gentle, cherished by all, and natural-born nurturers. Any pack led by an Omega was destined to flourish—its members strong inside and out, its cubs healthy and resilient.

The Suzu clan’s patriarch once rose to become Demon King. His reign was remembered as an era of Eutopia. Yet after two centuries of service, he relinquished the throne and entered a deep slumber, conserving his strength to prolong his life as a demon. But that very act became the seed of the catastrophe later called the Promised Day.

This is story of Iruma, born in the "Kalego Era"—a rare male Omega. Though he had the body of a human, in the Netherworld he would awaken his instincts, ambitions, and desires, alongside his classmates. (ABO, KalegoxIruma, Groundic fic, SURE WHY NOT?!!!)

Language:

English

Words:

5,379

Chapters:

5/?

Comments:

24

Kudos:

105

Bookmarks:

20

Hits:

1,146
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)
06 Dec 2025
Tags
- Graphic Depictions Of Violence
- Suzuki Iruma
- Balam Shichiro
- Babyls Staff (Mairimashita! Iruma-kun)
- Opera (Mairimashita! Iruma-kun)
- Lord Sullivan (Mairimashita! Iruma-kun)
- Suzuki Iruma's Parents
- Ami Kirio
- Grounding | Removing Wings (Mairimashita! Iruma-kun)
- Psychological Trauma
- Flashbacks
- Iruma is not okay
- Demon Suzuki Iruma
- Blood and Injury
- Child Abuse
- Iruma's parents are massive scumbags
- child mutilation
- Graphic Description
- Angst
- Emotional Hurt/Comfort
- Panic Attacks
- anime/manga spoilers
- This slowly turns into fluff
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!"

Language:

English

Words:

7,563

Chapters:

13/?

Comments:

26

Kudos:

178

Bookmarks:

40

Hits:

2,111
Rotting flowers by Rue_16

Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga)
06 Dec 2025
Tags
- Graphic Depictions Of Violence
- Lord Sullivan & Suzuki Iruma
- Opera & Suzuki Iruma
- Abnormal Class | Misfit Class & Suzuki Iruma
- Balam Shichiro & Suzuki Iruma
- Abnormal Class | Misfit Class & Balam Shichiro
- Abnormal Class | Misfit Class & Naberius Kalego
- Suzuki Iruma & Original Male Character(s)
- Naberius Kalego & Suzuki Iruma
- Asmodeus Alice & Suzuki Iruma
- Suzuki Iruma
- Raim (Mairimashita! Iruma-kun)
- Lord Sullivan (Mairimashita! Iruma-kun)
- Opera (Mairimashita! Iruma-kun)
- Naberius Kalego
- Asmodeus Alice
- Valac Clara
- Abnormal Class | Misfit Class (Mairimashita! Iruma-kun)
- Sabnock Sabro
- Babyls Staff (Mairimashita! Iruma-kun)
- Original Male Character(s)
- Azazel Ameri
- Horror
- Psychological Horror
- Survival Horror
- Implied/Referenced Child Abuse
- Past Child Abuse
- Canonical Child Abuse
- teachers who care <3
- Metaphors
- Body Horror
- Inspired by Dreams
- Dreams
- No Smut
- No Romance
- Confusion
- Nosebleed
- Not actual blood
- Crying
- Self-Hatred
- Secrets
- Overthinking
- They/Them Pronouns For Opera (Mairimashita! Iruma-kun)
- iruma suzuki centric
- Difficult Decisions
- Hallucinations
- Suicidal Thoughts
- Flowers
- Hes not okay
- the teachers are cool
- Slow To Update
- Out of Character
Summary

Flowers take a while to bloom, once they’re the beautiful colours and shapes they are easy to neglect and damage that beauty.
Iruma Suzuki, 15 years old, has spent his whole life figuring out things himself. He doesn’t need help, that’s pathetic.
But maybe the darkness has different ideas, maybe that guilt, that horror is shoved into a jar. But that jar has cracks and a loose lid, allowing the very thing that breaks Iruma. The thing that causes his flower to wilt and crumble.
NO SHIPS.
OC IS MAINLY FOR PLOT.

Language:

English

Words:

6,932

Chapters:

10/?

Comments:

26

Kudos:

81

Bookmarks:

12

Hits:

1,647
The Start by IzzzNa

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)
05 Dec 2025
Tags
- Graphic Depictions Of Violence
- Demon King Derkila & Suzuki Iruma
- Asmodeus Alice & Suzuki Iruma & Valac Clara
- Opera & Suzuki Iruma
- Lord Sullivan & Suzuki Iruma
- Suzuki Iruma
- Opera (Mairimashita! Iruma-kun)
- Lord Sullivan (Mairimashita! Iruma-kun)
- Demon King Derkila (Mairimashita! Iruma-kun)
- Asmodeus Alice
- Valac Clara
- Naberius Kalego
Summary

What if Iruma is Delkira's son??

Series
- Part 2 of Iruma's life as Delkira's son
Language:

English

Words:

3,878

Chapters:

5/?

Comments:

10

Kudos:

89

Bookmarks:

17

Hits:

1,571
In Some Devilish Business by Anonymous

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)
05 Dec 2025
Tags
- No Archive Warnings Apply
- Creator Chose Not To Use Archive Warnings
- Suzuki Iruma & Reader
- Opera & Lord Sullivan & Suzuki Iruma & Reader
- Asmodeus Alice/Reader
- Suzuki Iruma
- Lord Sullivan (Mairimashita! Iruma-kun)
- Asmodeus Alice
- Valac Clara
- Opera (Mairimashita! Iruma-kun)
- Naberius Kalego
- Sabnock Sabro
- Ami Kirio
- Andro M. Jazz
- Isekai and Transmigration
- Found Family
- Gender-Neutral Reader-Insert
- Reader-Insert
- Other Additional Tags to Be Added
- Fluff
- Suzuki Iruma Has a Twin
- no beta we die like men
- There’s romance I swear - Freeform
- But mostly fluff
Summary

“You’re… different.” The disembodied says to you beyond the void of darkness that surrounds your entire being. It hums thoughtfully, “But still so… human…”

You’re not supposed to be here. You’re supposed to be dead, roadkill on the side of street and yet, you are alive and well.
-

In which, after a harrowing experience with a vehicle you shall not name, you find yourself in an entirely new world, many years into the past and fighting to scrape by with a new brother by your side. Things take an interesting though, when your so called “adoptive parents” sold your eternal souls to a demon from the Netherworld.

Language:

English

Words:

23,685

Chapters:

5/?

Collections:

1

Comments:

9

Kudos:

46

Bookmarks:

12

Hits:

575
The daughter-in-law of the head of the demonic patrol — Prince of the Netherworld by Tina_Kim

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)
05 Dec 2025
Tags
- Creator Chose Not To Use Archive Warnings
- Azazel Ameri/Suzuki Iruma
- Azazel Ameri & Azazel Henri
- Azazel Henri & Suzuki Iruma
- Suzuki Iruma & Original Female Character(s)
- Demon King Derkila (Mairimashita! Iruma-kun)/Original Female Character(s)
- Suzuki Iruma & The Thirteen Crowns (Mairimashita! Iruma-kun)
- Asmodeus Alice & Suzuki Iruma
- Suzuki Iruma & Belial-Berry Razberry & Leviathan Leiji
- Asmodeus Alice & Azazel Ameri
- Suzuki Iruma & Original Male Character(s)
- Suzuki Iruma
- Azazel Ameri
- Azazel Henri
- Lord Sullivan (Mairimashita! Iruma-kun)
- Opera (Mairimashita! Iruma-kun)
- Original Female Character(s)
- Naberius Kalego
- Balam Shichiro
- Naberius Kalego's Uncle (Mairimashita! Iruma-kun)
- Naberius Narnia
- Lord Belial (Mairimashita! Iruma-kun)
- Lady Levi (Mairimashita! Iruma-kun)
- Demon King Derkila (Mairimashita! Iruma-kun)
- Belial-Berry Razberry
- Leviathan Leiji
- Asmodeus Alice
- Abnormal Class | Misfit Class (Mairimashita! Iruma-kun)
- The Thirteen Crowns (Mairimashita! Iruma-kun)
- Intersex Suzuki Iruma
- Demon Prince Suzuki Iruma
- Demon King Derkila is Suzuki Iruma's Dad
- Mention of Demon King Derkila
- Iruma is ok wearing women's men's or unisex clothing
- Sullivan Is A Good Grandpa
- Temporary Changes to Gender or Sex
- Bottom Suzuki Iruma
- Top Azazel Ameri
- Male Azazel Ameri
- Trans Azazel Ameri
- Henry Is A Guardian Grandpa
- Suzuki Iruma Has a Big Brother(s)/Sister(s)
- Alternate Universe - Canon Divergence
- Mpreg | Male Pregnancy
- Pregnant Suzuki Iruma
- Non-Sexual Intimacy
- Resolved Sexual Tension
- Sex Toys
- Tender Sex
- Pregnant Sex
- Demon — Freeform
- This Fandom Needs More Fluff and a Kindness in Storyline
- Ukrainian fandom Mairimashita Iruma-kun
- Don't Like Don't Read
- I Can't Believe I Wrote This
- Maybe I Edit Tags
Summary

Дві червоні смужки

Серце закололо і все потемніло в очах

Коронований демон Азазель ледь не отримав інфаркт коли побачив позитивний тест на вагітність. Він зумів дихати спокійно лише коли виявилося, що це не його дочки. Вона не стала скарбничкою їх родини

Але щастя тривало не довго. Знайшли кому належить титул "Скарбниця дому Азазель", тож тепер на вухах стоїть весь патруль

Language:

Українська

Words:

5,086

Chapters:

3/?

Comments:

4

Kudos:

6

Bookmarks:

2

Hits:

186
El Secreto de la Bestia Real by Gatu

Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga)
05 Dec 2025
Tags
- Creator Chose Not To Use Archive Warnings
- Amduscias Poro/Demon King Derkila
- Asmodeus Alice/Suzuki Iruma/Valac Clara
- Demon King Derkila (Mairimashita! Iruma-kun)
- Suzuki Iruma
- Opera (Mairimashita! Iruma-kun)
- Amduscias Poro
- Lord Sullivan (Mairimashita! Iruma-kun)
- Valac Clara
- Asmodeus Alice
- Six Fingers (Mairimashita! Iruma-kun)
- Naberius Kalego
- Naberius Narnia
- Balam Shichiro
Summary

Iruma pensaba que su vida en Babyls no podía ser más complicada… hasta que descubre, en los registros secretos de la Royal One, la existencia de la Bestia de la Corona, la demonio de seguridad que acompañaba a Delkira y desapareció junto a él.

La curiosidad de Iruma lo llevará a atar cabos con el Anillo Glotón —un objeto que alguna vez pasó por sus manos— y, sin saberlo, se convertirá en el blanco de quienes buscan a toda costa traer de vuelta al antiguo Rey Demonio.

Porque mientras para unos ella fue la amante del Rey, para otros sigue siendo la bestia que guarda su mayor secreto.

Language:

Español

Words:

23,430

Chapters:

17/?

Comments:

3

Kudos:

23

Bookmarks:

4

Hits:

536
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)
05 Dec 2025
Tags
- Creator Chose Not To Use Archive Warnings
- Rape/Non-Con
- Balam Shichiro & Naberius Kalego
- Suzuki Iruma & Suzuki Iruma's Parents
- Naberius Kalego & Suzuki Iruma
- Opera & Lord Sullivan & Suzuki Iruma
- Suzuki Iruma
- Naberius Kalego
- Balam Shichiro
- Opera (Mairimashita! Iruma-kun)
- Lord Sullivan (Mairimashita! Iruma-kun)
- Child Abuse
- Implied/Referenced Child Abuse
- Abusive Suzuki Iruma's Parents
- Angst
- Fluff and Angst
- Child Suzuki Iruma
- Demon Suzuki Iruma
- Half-demon Iruma Suzuki
- Evil Cycle | Wicked Phase (Mairimashita! Iruma-kun)
- Suzuki Iruma in their Evil Cycle | Wicked Phase
- Other Additional Tags to Be Added
- Tags Are Hard
- this was supposed to be a one-shot
- but I seem to have gotten carried away–
- Past Child Abuse
- Alpha/Beta/Omega Dynamics
- Non-Traditional Alpha/Beta/Omega Dynamics
- but that's not the main thing
- Iruma has long hair because it's a style
- Irumean Freedom
- There is art in the first chapter
- I'm very proud of this
- I Wrote This Instead of Sleeping
- I am posting the first chapter at my own risk.
- I'll see what comes of it in the morning. Have a nice day everyone.
- Not Beta Read
- We will die like Iruma's sanity
- English Is Not The Author's First Language
- They/Them Pronouns For Opera (Mairimashita! Iruma-kun)
Summary

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
- Part 1 of My brain is rotting from this story. I like it
Language:

English

Words:

96,772

Chapters:

12/?

Comments:

127

Kudos:

200

Bookmarks:

27

Hits:

4,866
The Demdols of mystery and mischief, Irumi and Itazura! 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)
03 Dec 2025
Tags
- No Archive Warnings Apply
- Opera (Mairimashita! Iruma-kun)
- Suzuki Iruma
- Lord Sullivan (Mairimashita! Iruma-kun)
- Mar (Mairimashita! Iruma-kun)
- Crocell Kerori | Kuromu
- Fluff
- Attempt at Humor
- Idols
- They/Them Pronouns For Opera (Mairimashita! Iruma-kun)
- Opera becomes the netherworld's Miku lmao
- Mentioned Hatsune Miku
- Brief balam and kalego cameo
Summary

Kerori was the netherworld's most popular Demdol, Kuromu.

But moreso, she was also a massive Demdol fan herself.

And Irumi just... had so much wasted potential!

Iruma gets roped into Kerori's desires to put him on stage, without her. He feels lost, and doesn't know what to do.

When a certain mischievous cat-demon offers to go up alongside him.

Language:

English

Words:

881

Chapters:

2/2

Comments:

1

Kudos:

30

Bookmarks:

2

Hits:

177
Chaos with the misfits and co. by Kodafreak

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)
03 Dec 2025
Tags
- Creator Chose Not To Use Archive Warnings
- No Archive Warnings Apply
- Asmodeus Alice/Suzuki Iruma/Valac Clara
- Agares Picero/Gaap Goemon
- Allocer Schneider/Andro M. Jazz
- Agares Picero & Crocell Kerori | Kuromu
- Balam Shichiro & Naberius Kalego
- Naberius Kalego & Opera
- Bars Robin & Naberius Kalego
- Ix Elizabetta & Shax Lied
- Asmodeus Alice & Sabnock Sabro
- Balam Shichiro & Opera
- Purson Soi/Shax Lied
- Crocell Kerori | Kuromu/Gyari
- Crocell Kerori | Kuromu & Gyari
- Suzuki Iruma
- Asmodeus Alice
- Valac Clara
- Agares Picero
- Gaap Goemon
- Allocer Schneider
- Andro M. Jazz
- Crocell Kerori | Kuromu
- Purson Soi
- Caim Kamui
- Ix Elizabetta
- Sabnock Sabro
- Shax Lied
- Naberius Kalego
- Opera (Mairimashita! Iruma-kun)
- Lord Sullivan (Mairimashita! Iruma-kun)
- Bars Robin
- Balam Shichiro
- Morax Momonoki
- Dandalion Dali
- Buer Blushenko
- Camu Camu (Mairimashita! Iruma-kun)
- Marbas March
- Orias Oswell
- Raim (Mairimashita! Iruma-kun)
- Stolas Suzy
- Gyari (Mairimashita! Iruma-kun)
- Beeber (Mairimashita! Iruma-kun)
- Nenette | Nene-chan (Mairimashita! Iruma-kun)
- Rejin (Mairimashita! Iruma-kun)
- Ichigoma (Mairimashita! Iruma-kun)
- Andro M. Rock
- Abnormal Class | Misfit Class (Mairimashita! Iruma-kun)
- chatfic
- Naberius Kalego is done
- Kerori and Picero are frienemies
- chaotic Valac Clara
- Purson Soi is also somewhat choatic
- Oblivious Gaap Goemon
- Purson Soi would make for an excellent spy
- Strict Naberius Kalego
- Opera likes to bother Kalego
- They/Them Pronouns For Opera (Mairimashita! Iruma-kun)
- Lord Sullivan is a doting grandpa
- Andro M Rock bashing
- Comfort/Angst
- Shax Lied is a Bisexual Disaster
- Omnisexual Andro M Jazz
- Semi Doomed Yuri
- Will They Become Undoomed
- Find Out Next Time on Dragon Ball Z
- I Will sprinkle some actually writing from time to time
- Other Additional Tags to Be Added
Summary

Chaos.

No set schedule with this, I'll update it whenever!

Language:

English

Words:

5,556

Chapters:

2/?

Comments:

3

Kudos:

15

Bookmarks:

4

Hits:

274
Shadows of the Past by NegaDot

Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga)
02 Dec 2025
Tags
- Graphic Depictions Of Violence
- Balam Shichiro/OC
- Naberius Kalego/OC
- Suzuki Iruma/Azazel Ameri
- Naberius Kalego
- Balam Sicirue
- Suzuki Iruma
- Lord Sullivan (Mairimashita! Iruma-kun)
- Opera (Mairimashita! Iruma-kun)
- Bars Robin
- Barbatos Bachiko
- Drama
- Angst
- Romance
Summary

An old adversary suddenly appears in Babylus much to the chagrin of the faculty. This demon is ready to sink her fangs into whatever she wants and what she wants is...Kalego?! Despite his strength, this will be one Hell of a fight.

Language:

English

Words:

272,231

Chapters:

66/?

Collections:

1

Comments:

19

Kudos:

66

Bookmarks:

15

Hits:

4,099
Born Grounded by Sounny

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)
02 Dec 2025
Tags
- No Archive Warnings Apply
- Asmodeus Alice & Suzuki Iruma & Valac Clara
- Lord Sullivan & Suzuki Iruma
- Suzuki Iruma & Everyone
- Balam Shichiro & Suzuki Iruma
- Opera & Lord Sullivan & Suzuki Iruma
- Suzuki Iruma
- Lord Sullivan (Mairimashita! Iruma-kun)
- Opera (Mairimashita! Iruma-kun)
- Asmodeus Alice
- Valac Clara
- Abnormal Class | Misfit Class (Mairimashita! Iruma-kun)
- Naberius Kalego
- Balam Shichiro
- Grounding Fic
- Emotional Hurt/Comfort
- Angst and Hurt/Comfort
- Parental Naberius Kalego
- Parental Balam Shichiro
- Cinnamon Roll Suzuki Iruma
- Canonical Child Abuse
- Tags May Change
- Other Additional Tags to Be Added
- Tags Are Hard
Summary

A grounding fic with lots of highs and lows. The teachers will get some insight into Iruma's life and this will cause a domino effect. It's doesn't really resemble the original story anymore. Update: Next chapter all Misfits and all teachers will know Iruma is human. The parental tags are really going to come into play soon.

Language:

English

Words:

27,052

Chapters:

22/?

Comments:

125

Kudos:

617

Bookmarks:

124

Hits:

21,864
Human in the underworld by Racoon3

Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga)
01 Dec 2025
Tags
- Creator Chose Not To Use Archive Warnings
- No Archive Warnings Apply
- Naberius Kalego/Reader
- Naberius Kalego
- Balam Shichiro
- Opera (Mairimashita! Iruma-kun)
- Lord Sullivan (Mairimashita! Iruma-kun)
- Vaginal Fingering
- Oral Sex
- Vaginal Sex
- Non-Consensual Spanking
- Predator/Prey
- Feral Behavior
Summary

Our dear reader aka a scientist know as Lara Croft of her university accidentally opened a portal to the underworld that was sealed centuries ago.

Now living in the underworld she must face the trouble her simple existence bring

Language:

English

Words:

9,350

Chapters:

1/1

Kudos:

6

Hits:

124
Baby bird goes cheep cheep~ by Lyra_the_Kitsune16

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)
01 Dec 2025
Tags
- No Archive Warnings Apply
- Balam Shichiro & Suzuki Iruma
- Balam Shichiro & Opera
- Balam Shichiro & Lord Sullivan
- Naberius Kalego & Suzuki Iruma
- Balam Shichiro & Naberius Kalego
- Balam Shichiro
- Suzuki Iruma
- Opera (Mairimashita! Iruma-kun)
- Lord Sullivan (Mairimashita! Iruma-kun)
- Naberius Kalego
- Raim (Mairimashita! Iruma-kun)
- Stolas Suzy
- Rituals
- Baby Suzuki Iruma
- Parental Balam Shichiro
- Accidental Baby Acquisition
- De-Aged Suzuki Iruma
- Jealous Lord Sullivan
- opera holds all the brain cells
- will tag as I go
- Slow Burn
- Feather Preening
Summary

Iruma didn't answer, instead staring at the older gargoyle, tears still streaming down his face. Oh no…he didn't
“Shichiro-kun, do you know what's going on?”, Opera asked, their eyes darting between the two gargoyles.
Shichiro swallowed the spit that had been pooling in his mouth. “Um…I think…I think Iruma imprinted…on…on me.”
or
Mama hen Shichiro ends up with a baby bird

Language:

English

Words:

9,165

Chapters:

10/?

Comments:

56

Kudos:

296

Bookmarks:

44

Hits:

4,078

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魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga) (763)
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魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga) (763)
魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime) (622)
僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga) (16)
Original Work (3)
Assassination Classroom (3)
文豪ストレイドッグス | Bungou Stray Dogs (3)
鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime) (3)
転生したらスライムだった件 - 伏瀬 | Tensei Shitara Slime Datta Ken | That Time I Got Reincarnated as a Slime - Fuse (3)
Hazbin Hotel (Cartoon) (3)
魔界の主役は我々だ! | Makai no Shuyaku wa Wareware da! (Manga) (3)

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Suzuki Iruma (719)
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Asmodeus Alice (490)
Naberius Kalego (453)
Valac Clara (436)
Balam Shichiro (328)
Abnormal Class | Misfit Class (Mairimashita! Iruma-kun) (265)
Azazel Ameri (188)
Shax Lied (153)

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Lord Sullivan & Suzuki Iruma (205)
Asmodeus Alice/Suzuki Iruma (155)
Opera & Suzuki Iruma (154)
Asmodeus Alice & Suzuki Iruma & Valac Clara (141)
Naberius Kalego & Suzuki Iruma (112)
Suzuki Iruma & Everyone (89)
Asmodeus Alice & Suzuki Iruma (82)
Abnormal Class | Misfit Class & Suzuki Iruma (65)
Suzuki Iruma & Valac Clara (62)
Balam Shichiro & Suzuki Iruma (62)

Exclude Additional Tags

Fluff (129)
Angst (109)
Other Additional Tags to Be Added (103)
Cinnamon Roll Suzuki Iruma (80)
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1 - 20 of 814 Works in Lord Sullivan (Mairimashita! Iruma-kun)

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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)

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Summary

Here we go again by blauji

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)

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Da(ddy)li Dantalion - "Your Name is Just Another Word For 'Dad'" by BadAssFemaleFighter

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)

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Bound by Fate - "Becoming a Demon's Bride" by BadAssFemaleFighter

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)

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Life outside security by Enji_Kaiju

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)

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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)

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The Journey of the Throne: Life as a Male Omega in the Netherworld by Blue_2523

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)

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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)

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Rotting flowers by Rue_16

Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga)

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The Start by IzzzNa

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)

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In Some Devilish Business by Anonymous

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)

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The daughter-in-law of the head of the demonic patrol — Prince of the Netherworld by Tina_Kim

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)

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El Secreto de la Bestia Real by Gatu

Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga)

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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)

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The Demdols of mystery and mischief, Irumi and Itazura! 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)

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Chaos with the misfits and co. by Kodafreak

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)

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Shadows of the Past by NegaDot

Fandoms: 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga)

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Born Grounded by Sounny

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)

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