Adult Content Warning

This work could have adult content. If you continue, you have agreed that you are willing to see such content.

• Yes, Continue
• No, Go Back

If you accept cookies from our site and you choose "Yes, Continue", you will not be asked again during this session (that is, until you close your browser). If you log in you can store your preference and never be asked again.

1. 𝐻𝑎𝑟𝑣𝑒𝑦 by Shuichi

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

   • Not Rated
   • Creator Chose Not To Use Archive Warnings
   • No category
   • Complete Work

   09 Nov 2025

   Tags

   • Creator Chose Not To Use Archive Warnings
   • Agatsuma Zenitsu & Kaigaku
   • Agatsuma Zenitsu & Kamado Tanjirou
   • Agatsuma Zenitsu & Hashibira Inosuke & Kamado Tanjirou
   • Agatsuma Zenitsu & Kaigaku & Kuwajima Jigorou
   • Agatsuma Zenitsu & Hashibira Inosuke
   • Agatsuma Zenitsu & Kokushibou | Tsugikuni Michikatsu
   • Kaigaku & Kokushibou | Tsugikuni Michikatsu
   • Agatsuma Zenitsu
   • Kaigaku (Kimetsu no Yaiba)
   • Kamado Tanjirou
   • Hashibira Inosuke
   • Chuntaro | Ukogi (Kimetsu no Yaiba)
   • Butterfly Estate Ensemble (Kimetsu no Yaiba)
   • Takada Naho
   • Nakahara Sumi
   • Terauchi Kiyo
   • Kakushi Ensemble (Kimetsu no Yaiba)
   • Kokushibou | Tsugikuni Michikatsu
   • Mentioned Kanzaki Aoi (Kimetsu no Yaiba)
   • Mentioned Shinazugawa Genya
   • Mentioned Tsuyuri Kanao
   • Mentioned Tsugikuni Yoriichi
   • Alternate Universe - Canon Divergence
   • Alternate Universe - Everyone Lives/Nobody Dies
   • Except Kuwajima Jigorou
   • Agatsuma Zenitsu Needs a Hug
   • Agatsuma Zenitsu is So Done
   • Kaigaku is a Good Sibling? (Kimetsu no Yaiba)
   • Kaigaku Tries (Kimetsu no Yaiba)
   • Alternate Universe - Everyone is a Demon Slayer
   • Other Additional Tags to Be Added
   • Sibling Bonding
   • Amnesia
   • Temporary Amnesia
   • Fluff and Angst
   • Agatsuma Zenitsu-centric
   • Kaigaku-centric (Kimetsu no Yaiba)
   • Kokushibou | Tsugikuni Michikatsu-centric
   • Kokushibou | Tsugikuni Michikatsu is not good with children
   • imposter syndrome

   Summary

   To describe the relationship Zenitsu had with his senior, he only had to use one word; dead. They were two different people somehow destined to despise each other. With no way to reunite or bond with one another. For his fellow Thunder breathing user refused to form any meaningful connection between them.

   So when his 'brother's' personality had suddenly turned on itself. Zenitsu thinks that his senior had been replaced by a demon. No, he's sure of it.

   __
   This is part of my random Au - Everyone Is A Demon Slayer - which speaks for itself, everyone is a demon slayer, including Muzan (He takes the Oyakata-sama role but this isn't a Roleswap.)

   Series

   • Part 1 of Everyone is a Demon Slayer

   Language:

   English

   Words:

   37,820

   Chapters:

   6/6

   Comments:

   17

   Kudos:

   107

   Bookmarks:

   17

   Hits:

   1,891