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• Your Best Nightmare by ADHD_problems

  Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)  

  • Teen And Up Audiences
  • Graphic Depictions Of Violence
  • No category
  • Work in Progress

  12 Oct 2025

  Tags

  • Graphic Depictions Of Violence
  • Shinazugawa Genya & Shinazugawa Sanemi
  • Shinazugawa Sanemi/Tomioka Giyuu
  • Akaza | Hakuji/Koyuki (Kimetsu no Yaiba)
  • Douma/Kotoha (Kimetsu no Yaiba)
  • Hashibira Inosuke/Kanzaki Aoi
  • Kamado Tanjirou/Tsuyuri Kanao
  • Agatsuma Zenitsu/Kamado Nezuko
  • Agatsuma Zenitsu & Kaigaku
  • Daki | Ume & Gyutaro (Kimetsu no Yaiba)
  • Gyutaro/Kaigaku (Kimetsu no Yaiba)
  • Agatsuma Zenitsu & Shinazugawa Genya
  • Kamado Nezuko & Shinazugawa Genya
  • Akaza | Hakuji & Kamado Nezuko
  • Shinazugawa Genya & Yushiro
  • Kochou Shinobu & Shinazugawa Sanemi
  • Kokushibou | Tsugikuni Michikatsu & Shinazugawa Genya
  • Kokushibou | Tsugikuni Michikatsu/Kokushibou | Tsugikuni Michikatsu's Wife
  • Tsugikuni Yoriichi/Uta
  • Tsugikuni Yoriichi & Koyuki (Kimetsu no Yaiba)
  • Shinazugawa Genya
  • Agatsuma Zenitsu
  • Kokushibou | Tsugikuni Michikatsu
  • Kamado Nezuko
  • Daki | Ume (Kimetsu no Yaiba)
  • Gyutaro (Kimetsu no Yaiba)
  • Kaigaku (Kimetsu no Yaiba)
  • Tsugikuni Yoriichi
  • Shinazugawa Sanemi
  • Koyuki (Kimetsu no Yaiba)
  • Akaza | Hakuji (Kimetsu no Yaiba)
  • Hashibira Inosuke
  • Kanzaki Aoi (Kimetsu no Yaiba)
  • Douma (Kimetsu no Yaiba)
  • Yushiro (Kimetsu no Yaiba)
  • Tamayo (Kimetsu no Yaiba)
  • Nakime (Kimetsu no Yaiba)
  • Kibutsuji Muzan
  • Human Experimentation
  • Mutation
  • Mad Scientists
  • Kaigaku is a Good Sibling (Kimetsu no Yaiba)
  • Kokushibou | Tsugikuni Michikatsu is a Good Sibling
  • Douma is Hashibira Inosuke's Parent
  • Title from an Undertale Song
  • Shinazugawa Genya Needs a Hug
  • Alternate Universe - Modern Setting

  Summary

  Subject 015 is administered to the Kibutsuji Labs.
  But who is he really?
  And what's wrong with him?
  Who.
  Is.
  He.

  OR

  KNY experiment au where everyone gets a little trauma :)

  Language:

  English

  Words:

  931

  Chapters:

  1/?

  Kudos:

  10

  Bookmarks:

  1

  Hits:

  150