Fics like By the Demon King’s Word

Based on chapter 447 of Welcome to Demon School! Iruma-kun. When Iruma’s secret is exposed and the Demon Border Patrol comes to drag him back to the human world, Babyls becomes a battlefield. Cornered, wounded, and terrified of losing the family he found in the Netherworld, Iruma reaches deeper into his greed than ever before and awakens a terrifying power within Ali-san’s ring. But Fenrir’s attack is only the beginning. As the Misfit Class, the teachers, Opera, and Sullivan are forced to choose between law and loyalty, the truth behind Fenrir’s identity threatens to destroy everything Iruma has built. And when all hope seems lost, an impossible voice returns to the Netherworld. The missing Demon King has one final judgment to pass: Iruma is demon enough.

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  2. The King Who Searched by CaleSlackerWife (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), more)
  3. You're Silence Was Your World [And Now It's Ours] by Paradox_Void (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))
  4. Neverland Curse by Caspyre (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))
  5. The Other Kind of Beautiful Flower by mofumofu (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga))
  6. The King Inside the Ring by Komneid128 (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), more)
  7. The Grounded Granddaughter by Lulabell13 (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))
  8. why have One grandson when you can have Eleven Grandchildren? (and add-ons!) by scrawly_times (呪術廻戦 | Jujutsu Kaisen (Anime), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga))
  9. Fuck It by Moony__Marvel (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))
  10. A Tomb Called Babyls by Onyxia_7002 (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))
  11. Authority of the Demon King by Alittlwweirdo (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), more)
  12. Something Unexpected {HIATUS} by Insatiable_Fool (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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  14. The Demon Who Was Not Supposed to Wake Up by ChaoticCelestialCreation (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))
  15. Tell Me—Can you see me? by Williamcipher (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. The Ground We Walk On. by GarnetJPH (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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  19. Li p’ti éfant avou l' pâpa ; How a demon lord adopted a human child. by Coton_De_Loup (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))
  20. A Wing for a Wing by BailMyQuayle (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))