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1. Demon slayer Muzan vs Demon king Tanjiro by RatDuckDuckYou

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

   • Mature
   • Graphic Depictions Of Violence, Major Character Death
   • Gen
   • Work in Progress

   25 Oct 2025

   Tags

   • Graphic Depictions Of Violence
   • Major Character Death
   • Kamado Nezuko & Kibutsuji Muzan
   • Kamado Kie & Kibutsuji Muzan
   • Kamado Hanako/Ubuyashiki Kiriya
   • Kamado Kie & Ubuyashiki Amane
   • Kamado Takeo & Rengoku Senjurou
   • Kibutsuji Muzan & Ubuyashiki Family
   • Kibutsuji Muzan/Kochou Shinobu
   • Tsugikuni Yoriichi & Uta
   • Uta & Kamado family
   • Ubuyashiki Amane/Ubuyashiki Kagaya
   • Kibutsuji Muzan
   • Kamado Family (Kimetsu no Yaiba)
   • Demon Slayer Corps Hashira | Pillars
   • Lower Demon Moons Ensemble (Kimetsu no Yaiba)
   • Upper Demon Moons Ensemble (Kimetsu no Yaiba)
   • Ubuyashiki Family (Kimetsu no Yaiba)
   • Uta (Kimetsu no Yaiba)
   • Kamado Nezuko
   • Kamado Kie
   • Kamado Takeo
   • Kamado Hanako
   • Kamado Rokuta
   • Kibutsuji Muzan Being an Asshole
   • Good Kibutsuji Muzan
   • Demon King Kamado Tanjirou
   • Adopted Sibling Relationship
   • Kidnapping
   • Human Kibutsuji Muzan
   • Post-Traumatic Stress Disorder - PTSD
   • Trauma
   • Demon Slayer Kamado Nezuko
   • Unhealthy Coping Mechanisms
   • Terminal Illnesses
   • Bodyswap
   • Post-Betrayal
   • Depression
   • Suicidal Thoughts
   • Tokitou Yuichirou Lives
   • Makomo Lives (Kimetsu no Yaiba)
   • Human Kamado Nezuko
   • Demon Kochou Kanae
   • Demon Rengoku Senjurou
   • Upper moon 5 Tamayo
   • The Kamado Family Lives (Kimetsu no Yaiba)

   Summary

   Three years had passed since Muzan suddenly woke up in Tanjiro's body. Surprisingly, he did not hate it as much as he thought he would. For the first time in centuries, he enjoyed the warmth of the sun, was surrounded by a loving family, and lived a peaceful life.

   Until.

   He learned that three years ago, Tanjiro had woken up in his original body and decided to make his tenure as the demon lord permanent.

   Now, Muzan's sole desire was to reclaim his throne.

   Language:

   English

   Words:

   507,965

   Chapters:

   90/?

   Comments:

   225

   Kudos:

   387

   Bookmarks:

   65

   Hits:

   16,602