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1. Public Bookmark 17

   Lost in Transformation (Revised) by theDeltaNiner

   Fandoms: ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Video Game), ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Anime)  

   • Mature
   • No Archive Warnings Apply
   • F/F
   • Complete Work

   18 May 2026

   Tags

   • No Archive Warnings Apply
   • Agnes Tachyon/Trainer (Uma Musume)
   • Agnes Tachyon (Uma Musume)
   • Trainer (Uma Musume)
   • Original Female Character(s)
   • Manhattan Cafe (Uma Musume)
   • Agnes Digital (Uma Musume)
   • Jungle Pocket (Uma Musume)
   • toxic yuri
   • Established Relationship
   • Transformation
   • they're not good for each other but they will certainly try
   • tachy deserves an actual character arc
   • horsefem but not transhorsefem
   • Angst and Hurt/Comfort
   • a whole lotta angst let's be real

   Summary

   Agnes Tachyon has gone AWOL for a few days now. In search of her is her trainer Elena, who has come to her trainee's lab one last time to try and track her down.

   In that absence, Tachyon has concocted her newest masterpiece, something she claims will shatter the boundaries of umamusume knowledge. But in the aftermath that follows the experiment, the strained relationship between trainer and trainee is met with an uncertain reality, and a very unsteady future.

   This fic will update every three days.

   Language:

   English

   Words:

   22,220

   Chapters:

   9/9

   Comments:

   41

   Kudos:

   91

   Bookmarks:

   17

   Hits:

   2,212

   Bookmarked by thatvix

   22 May 2026