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   twenty-one twenty-one by tomiawka

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

   • Explicit
   • No Archive Warnings Apply
   • M/M
   • Work in Progress

   23 Jun 2025

   Tags

   • No Archive Warnings Apply
   • Shinazugawa Sanemi/Tomioka Giyuu
   • Minor or Background Relationship(s)
   • Shinazugawa Sanemi
   • Tomioka Giyuu
   • Shinazugawa Genya
   • Kochou Kanae
   • Kochou Shinobu
   • Iguro Obanai
   • Kanroji Mitsuri
   • Rengoku Kyoujurou
   • and others! - Character
   • Twenty Five Twenty One AU
   • Alternate Universe - Modern Setting
   • Alternate Universe - College/University
   • Rivals to Friends to Lovers
   • Fluff
   • Angst
   • Hurt/Comfort
   • Slow Burn
   • Rivals to Lovers
   • Online Friendship
   • Alternate Universe - Sports
   • Other Additional Tags to Be Added
   • the "fuck that guy" to "i wanna fuck that guy" pipeline is real
   • sorry that sanemi's astronomically pathetic here i only know how to write pathetic men
   • Eventual Smut
   • Roommates
   • honestly rivals to homoerotic codependent friends slash rivals to lovers is more accurate
   • Mutual Pining
   • its mutual except they didnt know it lol
   • Yearning
   • Explicit Sexual Content
   • set in the late 2000s
   • so much Yearning its almost painful to write
   • Explicit Language
   • gratuitous use of anaphora throughout everything
   • Minor Character Death

   Summary

   This was Tomioka Giyuu, the prodigy and world champion, the youngest ever to win gold at the Olympics in all of fencing history.

   The bane of Sanemi’s existence. The pinnacle of his years. His dearly despised, most devotedly beloathed.

   And Shinazugawa Sanemi stood as his rival.

   (A Twenty Five Twenty One AU)

   [Translation into Russian now available!]
   [Translation into Bahasa Indonesia now available!]
   [Translation into Chinese now available!]

   Language:

   English

   Words:

   239,846

   Chapters:

   19/21

   Comments:

   655

   Kudos:

   1,555

   Bookmarks:

   300

   Hits:

   41,829

   Bookmarked by wasww7

   02 Feb 2026