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1. 13 Days Of Cellular Chaos - 2026 by MatchaOcha (HakuSeki)

   Fandoms: はたらく細胞 | Hataraku Saibou | Cells at Work! (Anime & Manga), 細胞の話 | Saibou no Hanashi | The Story of Cells, はたらく細胞猫 | Hataraku Saibou Neko | Cells At Work! Cat (Manga)  

   • Not Rated
   • Creator Chose Not To Use Archive Warnings
   • F/M, M/M
   • Work in Progress

   19 Oct 2026

   Tags

   • Creator Chose Not To Use Archive Warnings
   • Red Blood Cell AE3803/White Blood Cell U-1146 (Hataraku Saibou)
   • Red Blood Cell AE-3803/White Blood Cell U-1117 (Saibou no Hanashi)
   • Red Blood Cell AE3803/White Blood Cell U-4989 (Hataraku Saibou)
   • Red Blood Cell Fe9625/White Blood Cell C-0222 (Hataraku Saibou Neko)
   • White Blood Cell U-1146/White Blood Cell U-4989 (Hataraku Saibou)
   • Platelet Cell & White Blood Cell U-1146 (Hataraku Saibou)
   • Red Blood Cell AE3803 (Hataraku Saibou)
   • White Blood Cell U-1146 (Hataraku Saibou)
   • Red Blood Cell AE-3803 (Saibou no Hanashi)
   • White Blood Cell U-1117 (Saibou no Hanashi)
   • White Blood Cell U-4989 (Hataraku Saibou)
   • White Blood Cell C-0222 (Hataraku Saibou Neko)
   • Red Blood Cell Fe9625 (Hataraku Saibou Neko)
   • Platelet Division (Hataraku Saibou)
   • writing challenge
   • 13 days
   • Fluff
   • Kinks
   • Romance
   • Other Additional Tags to Be Added
   • Established Relationship
   • domestic life
   • Humor
   • Roleplay-ish
   • Laundry
   • Wearing your partner's clothes
   • Improper use of a kitchen utensil
   • Comedic Violence
   • 1146 is very into this actually
   • AE3803 accomplished nothing
   • Stalking
   • Boundary Issues
   • Unresolved Feelings
   • 3803 only wants to do her job
   • 1117 is a manipulative bastard
   • twist ending
   • Lunch Dates
   • Unrequited Love
   • Crushes
   • Ambiguous Feelings
   • 4989 needs a hug
   • stuck in an elevator
   • Pre-Relationship
   • Growing feelings
   • Almost moments
   • literally sleeping together
   • Canon-Typical Violence
   • sharing treats
   • deep affection
   • Kissing
   • Biting Kink
   • 0222 trying to be gentle but failing
   • Fe9625 low-key loves it
   • Ship Tease
   • slight OOC maybe
   • Cats
   • nekomimi
   • slight claustrophobia warning
   • peril and injury
   • Hurt/Comfort
   • Tea
   • 3803 tries to stay gentle
   • 1117 is his own worst wingman on romance
   • 1117 and 3803 are such a disaster but cute together lol
   • stuck sick at home
   • AE3803 is restless when she's sick
   • 1146 is a caring boyfriend
   • AA5100 and NT4201 cover for her

   Summary

   Made my own monthly challenge.

   First chapter has the prompts.

   Updated every other day on odd days throughout October.

   Language:

   English

   Words:

   18,004

   Chapters:

   8/14

   Comments:

   22

   Kudos:

   13

   Bookmarks:

   3

   Hits:

   92