1 - 20 of 814 Works in Opera (Mairimashita! Iruma-kun)

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  1. Baby bird goes cheep cheep~ by

    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 Oct 2025

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    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:
    3,556
    Chapters:
    4/?
    Comments:
    18
    Kudos:
    103
    Bookmarks:
    11
    Hits:
    965

  2. El Secreto de la Bestia Real by

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

    07 Oct 2025

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    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:
    22,190
    Chapters:
    16/?
    Comments:
    3
    Kudos:
    12
    Bookmarks:
    2
    Hits:
    295

  3. Searching for the lost piece by

    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 Oct 2025

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    Summary

    "[...] A Netherworld without Iruma was not a Netherworld worth living in. "Now, Clara, let's be careful. Repeat the rules to me" Asmodeus said, his arms crossed over his chest. Clara began to list with the fingers of her left hand, "First rule, look for Irumacchi everywhere but avoid danger. Second rule, talk to humans as little as possible and stick together. Third rule... um... don't do kablam with humans?" Asmodeus sighed and shook his head, "No, stupid Clara. The third rule is not to let humans know that we are demons. Sullivan-sama was very clear about that" he replied, tiredly. Sullivan had been clear, but only in the few answers he had given them. Asmodeus looked around, fearing that someone might be watching them. They were at the edge of a countryside, which bordered a large city silhouetted in front of them. A human city"

    Basically Narnia forced Iruma to return to the Human Realm and Asmodeus and Clara set out to find him and bring him back.

    Series
    Language:
    English
    Words:
    15,974
    Chapters:
    6/7
    Comments:
    53
    Kudos:
    165
    Bookmarks:
    25
    Hits:
    2,221

  4. До цього ніхто не був готовий by

    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 Oct 2025

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    Summary

    В свій час в Пеклі панували королі різного віку, різних видів та різні періоди. Були старше тисячі років, були молодше сотні років.

    Молодих коронованих, які ще носять форму здобувача освіти ні разу не було. Але з появою одної незвичайної персони в Пеклі, стало зрозуміло одне: будь-що може бути маймовірне, але ніколи не неможливе. Тепер старшим обранцям пекла доведеться переконатися на собі, чому їхня наймолодша "колега" така відома як найнестадартніший демон Нижнього Світу

    Series
    Language:
    Українська
    Words:
    4,073
    Chapters:
    4/6
    Kudos:
    7
    Hits:
    106

  5. How did this happen? by

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

    07 Oct 2025

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    Summary

    My own take on Iruma being discovered for having a lack of wings.

    Snippets of before shit goes down.

    A somewhat crack-fic vibe (low-level)

    Alice is blissfully ignorant (of Iruma and his feelings)

    People worry (rightfully so)

    Iruma is too much of people pleaser

    Author put low effort........sorry but not really

    Series
    Language:
    English
    Words:
    10,700
    Chapters:
    10/?
    Comments:
    64
    Kudos:
    537
    Bookmarks:
    78
    Hits:
    10,991

  6. Something Unexpected by

    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 Oct 2025

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    Summary

    Suzuki Iruma has never said 'no.' Not once. He was possibly the biggest pushover in the world. From shady proposals to outright illegal deals he'd yet to find anything he would decline. No matter how badly he wanted to. It's pathetic, really. Even he knows that. So when his parents– so kind, so polite– asked him if he could please finish a summoning circle for them, he walked into their basement without hesitation.

    One glance at the word ‘demon’ and Iruma wishes he was illiterate.

    or

    alternate timeline where Iruma summons Sullivan and, much like anything he does, things don't go to plan.

    Series
    Language:
    English
    Words:
    121,882
    Chapters:
    24/?
    Comments:
    754
    Kudos:
    1,353
    Bookmarks:
    369
    Hits:
    35,428

  7. Subtractive Mixture by

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

    07 Oct 2025

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    Summary

    Opera on loving people you can't love, living for someone else's sake, and a place in the world you're desperately holding on to.
    //
    "Right under your nose, the only draw to doing this, to staying alive-- they pale in comparison to simply knowing he's safe? It wasn’t on purpose, but here you are. You care now. Is it still your life, if it’s all for him?"
    [Mafia AU]

    Language:
    English
    Words:
    892
    Chapters:
    1/1
    Comments:
    12
    Kudos:
    13
    Bookmarks:
    4
    Hits:
    54

  8. Your Cursed Hands In Mine (Hiatus) by

    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 Oct 2025

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    Summary

    You were cursed as a baby, cursed so that any living thing you touched would rot and decay until dead. The only way you could avoid killing anything or anyone was to wear gloves. After trying every other option you could think of, you decide to resort to summoning a demon, hoping it could remove the curse. The demon doesn't know how to remove your curse at the moment, but is willing to help find a way....if you become his.....son? What?

    Language:
    English
    Words:
    8,591
    Chapters:
    7/?
    Comments:
    21
    Kudos:
    68
    Bookmarks:
    16
    Hits:
    972

  9. Febrero by

    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 Oct 2025

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    Summary

    Desde que se conocen, todos 14 y 15 de febrero de alguna forma han sido memorables para Iruma y Kalego.

    Language:
    Español
    Words:
    4,591
    Chapters:
    2/?
    Comments:
    4
    Kudos:
    9
    Hits:
    82

  10. Demon or human? Both!? by

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

    05 Oct 2025

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    Summary

    What if Iruma was the demon king's son but he left him in the human world for his safety. what if Iruma knew his father was a demon and mother a human. Read and find out.

    TW!!!

    Experimentation
    Mental issues
    Abused
    Trauma
    Depression
    Trust issues

    Language:
    English
    Words:
    4,755
    Chapters:
    4/?
    Comments:
    11
    Kudos:
    293
    Bookmarks:
    42
    Hits:
    4,203

  11. Welcome To Demon School! Angel-San! by

    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 Oct 2025

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    Summary

    Erica Cassiel had been a Guardian Angel for quite some time now and although her ward lead a life that was nothing short of perilous, she would barely be able save him on account of him somehow managing to save himself. It was almost infuriating in a way. If only she could save him from his terrible life, but alas, lower angels like herself were not allowed to go that far. At least until the day Iruma was dragged to the realm of demons and she had no other option than to bend a few rules.

    Or

    Iruma gets dragged into the Netherworld and his Guardian Angel follows.

    Language:
    English
    Words:
    38,582
    Chapters:
    16/?
    Comments:
    74
    Kudos:
    164
    Bookmarks:
    37
    Hits:
    4,486

  12. Opera Backstory!! by

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

    04 Oct 2025

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    Summary

    Basically a headcanon of Opera's backstory because we don't get enough Opera stories here.

    Language:
    English
    Words:
    4,999
    Chapters:
    2/?
    Comments:
    4
    Kudos:
    10
    Hits:
    193

  13. Courting by

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

    04 Oct 2025

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    Summary

    Alice Asmodeus was someone who valued the netherworld etiquette so it was only natural to follow the proper steps when it came to courtship.
    Unfortunately, his soulmates knew next to nothing about the subject and so this duty fell onto him.

    The first step is to of course get permission from your partner's guardians.

    Language:
    English
    Words:
    5,739
    Chapters:
    2/2
    Comments:
    22
    Kudos:
    162
    Bookmarks:
    14
    Hits:
    1,137

  14. Welcome To Demon School, Oberon! by

    Fandoms: Fate/stay night & Related Fandoms, Fate/Grand Order, 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 Oct 2025

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    Summary

    “Even I think it’s ridiculous. I at least know you enough to know that it’ll be a pointless endeavor. You can’t be happy. Not in here. Not in the Proper Human History.”
    “So I will just send you somewhere else."
    ---
    During familiar summoning, Iruma summoned a guest from Faerie Britain.

    Language:
    English
    Words:
    15,473
    Chapters:
    6/?
    Comments:
    67
    Kudos:
    155
    Bookmarks:
    40
    Hits:
    2,483

  15. 奇怪的RPG游戏 by

    Fandoms: 入间同学入魔了  

    02 Oct 2025

    Tags
    Language:
    中文-普通话 國語
    Words:
    1,355
    Chapters:
    1/1
    Comments:
    1
    Kudos:
    2
    Hits:
    32

  16. [欧入]蓝色小鸟 by

    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 Oct 2025

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    Summary

    if魔手党线。
    //私设年龄差九岁//
    //主要写漫画一笔带过的九年，爱情线很后面。//

    他的头靠着我，呼吸很轻，像一只小鸟降落在我肩膀。

    Series
    Language:
    中文-普通话 國語
    Words:
    43,512
    Chapters:
    15/?
    Comments:
    24
    Kudos:
    65
    Bookmarks:
    6
    Hits:
    1,208

  17. Не всі помилки так легко виправити by

    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 Oct 2025

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    Summary

    Нарнія зумів відправити Ірумі назад до світу людей. Така новина спричинила ще більший хаос ніж той, який був. Це допомогло знайти корінь проблеми повернення до витоку, але поставила під загрозу безпеку демонічного патруля. Вони попали під недобре око трьох великих демонів пекла
    Демони старих віків відомі своєю жадібністю. Їхні скарби налічують тисячі років. Найбільша жадібність була до щирих турбот та емоцій. Троє великих прабатьків сучасного Пекла знайшли це в людській дівчинці, яка тепер була відібрана в них тими, хто мав їх захищати.
    Тепер коронованим потрібно повернути людину назад, щоб не справу з роздратованими старими демонами, яким просто хотілося побавити дівча, яке було просто краплею в морі проблем

    Language:
    Українська
    Words:
    15,536
    Chapters:
    11/?
    Comments:
    2
    Kudos:
    19
    Bookmarks:
    4
    Hits:
    518

  18. I-love-Iruma-kun battle by

    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)  

    30 Sep 2025

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    Summary

    "[...] But the demons gathered in the room, seated on the guest sofas, were no ordinary demons. They yearned for the knowledge hidden behind those short, curled-up mustaches. They would do anything to possess that knowledge in material form. Ambition was what drove demons to power, and these young demons were consumed by their own ambition. And it was for this reason that they were all gathered there that afternoon after class. Sullivan sneered, the surface of his glasses suddenly illuminated by the light of a nearby bolt of lightning, further illuminating the room. "Let us begin..." he said, "...the bimonthly "I-love-Iruma-kun battle" meeting!" The demons in the room nodded simultaneously"

    Basically Sullivan holds a meeting session between members of an unofficial Battle where they exchange photos of Iruma.

    Series
    Language:
    English
    Words:
    2,532
    Chapters:
    1/1
    Comments:
    6
    Kudos:
    29
    Bookmarks:
    4
    Hits:
    261

  19. The Lost Puppy by

    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)  

    29 Sep 2025

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    Summary

    Я не думаю писать много, это работа обречена на то, чтобы быть заброшенной– 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.

    Language:
    English
    Words:
    15,942
    Chapters:
    2/?
    Comments:
    24
    Kudos:
    48
    Bookmarks:
    5
    Hits:
    579

  20. Cerberus by

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

    28 Sep 2025

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    Summary

    Iruma Suzuki is not stressed, not angry, and not pissed of course!!! Hes not blowing up that pretty much his classes vacation is going all wrong. Everything is totally fine he is also totally not mana malnourished.

    Or

    Happy fun times and Iruma gets more family :3 ALSO CHAOS

    Language:
    English
    Words:
    4,529
    Chapters:
    7/?
    Comments:
    28
    Kudos:
    85
    Bookmarks:
    20
    Hits:
    1,865

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