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   Alone in the Night by TeaPartyCannon

   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, Major Character Death
   • Gen
   • Work in Progress

   16 May 2026

   Tags

   • Graphic Depictions Of Violence
   • Major Character Death
   • Kokushibou | Tsugikuni Michikatsu & Tokitou Muichirou
   • Kokushibou | Tsugikuni Michikatsu
   • Tokitou Muichirou
   • Kibutsuji Muzan
   • Ubuyashiki Amane
   • Nakime (Kimetsu no Yaiba)
   • Douma (Kimetsu no Yaiba)
   • Akaza | Hakuji (Kimetsu no Yaiba)
   • Kochou Shinobu
   • Gyokko (Kimetsu no Yaiba)
   • Alternate Universe - Canon Divergence
   • Kokushibou | Tsugikuni Michikatsu-centric
   • Tokitou Muichirou-centric
   • Mentioned Tsugikuni Yoriichi
   • Forgetful Tokitou Muichirou
   • Tokitou Muichirou Needs a Hug
   • Kokushibou | Tsugikuni Michikatsu is Bad at Feelings
   • Parental Kokushibou | Tsugikuni Michikatsu
   • sometimes
   • Breath of the Moon User Tokitou Muichirou
   • Morally Grey Tokitou Muichirou
   • Kokushibou is Not a Good Parent
   • Kokushibo develops fatherly feelings maybe
   • Kokushibo gives Muichiro a new name
   • Amnesia
   • Unhealthy Relationships
   • Implied/Referenced Abuse
   • Graphic Description of Corpses
   • Angst
   • Angst with a Happy Ending
   • Kimetsu no Yaiba Manga Spoilers
   • Other Additional Tags to Be Added
   • Minor Original Character(s)
   • Angst with a Hopeful Ending
   • Minor Character Death

   Summary

   Kokushibo knew it would be easier to just turn the boy into a demon now. He had already lost his family, his memory, and even his own identity; there was nothing more that becoming a demon could take from him. But Kokushibo’s theory was that only a human who was trained in the art of Breathing could become a demon capable of Breathing, and the boy was still so far from his peak of strength and maturity. Until the time was right, he would have to remain human.

   But it had been almost four hundred years since Kokushibo had last cared for a human child. Since he’d been anything close to a father. And it was very, very apparent just how out of practice he was…

   --

   One fateful night, an injured Muichiro on the brink of death is found not by Amane and the Demon Slayer Corps, but by the Upper Moon One, Kokushibo. This changes everything.

   Language:

   English

   Words:

   72,304

   Chapters:

   12/?

   Comments:

   340

   Kudos:

   526

   Bookmarks:

   84

   Hits:

   11,860

   Bookmarked by GetScared

   20 Mar 2026