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Published:
2026-02-07
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862
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1/1
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Superluminal Abyss

Summary:

“Tachyon.”
A particle said to constantly exceed the speed of light.
It is purely theoretical. And yet, I must prove it exists.


At the 2001 Satsuki Sho, undefeated runner Agnes Tachyon ran an experiment. What existed beyond the limits of umamusume?

Notes:

(See the end of the work for notes.)

Work Text:

“We’re finally at the home stretch!”

300 meters. Not yet— Too soon.

The pounding of footsteps tearing up the turf rang in her ears, threatening to overtake. Dantsu Flame, Jungle Pocket. Both were right on her tail, chasing her, but that wouldn’t matter. Her speed stayed constant, her nerves unshakable. She let them catch up more.

200 meters was all she would need.

Ten seconds, to sear their eyes with the sight of her running. To finish her experiment. To prove its existence. If they got to observe it from close up, then all the better!

The 200 meter post flew by.

The world around her vanished. In its place was a dark void, surrounding her entire being. Equations etched in gold flew past at breakneck pace, as a path forward was revealed. Ghostly figures, stills of umamusume—no, of herself—fly by as she races forward. At the head of the path, a vision running ahead. She had her goal in sight. She pushed forward.

 


 

On the racetrack, the crowd roared and cheered as they watched Agnes Tachyon accelerate further, leaving the two other umamusume behind. Surging forward, the gap grew larger.

Half a length. Three quarters. One whole length.

As the crowd watched, a peculiar sight filled the eyes of each umamusume watching. A glow surrounding the lead horse, sparkling in bright and vivid colors. No, it wasn’t surrounding her. It was radiating from her. A calling. A challenge.

From my ashes, let new possibilities come to life.

 


 

The void peeled away to reveal a world bathed in rainbow lights. Colors broke off in splashes against her speeding body, getting ever brighter as she approached that eerie vision. Equations bathed in the light, streaking by. As she pushed forward, she made contact with it. Yet she knew it wasn’t enough. She had to become the vision.

Somewhere behind her, an inky black void formed. This wasn’t the familiar void where her equations filled the air. No, it was consuming that beautiful light that was surrounding her. A cold, unforgiving darkness. Darker than the world she painted her equations on. As she got closer to becoming the vision, it only grew larger, threatening to swallow her whole.

 


 

By now, it was impossible to miss. Both humans and umamusume were shocked by the brightening glow that was now surrounding Agnes Tachyon. Even now, it was clear who the winner of the race would be. And yet, she only pushed further beyond. Whether it was to set a record, or to show her dominance, it wasn’t clear to the crowd.

 


 

But it was very clear to her.

The moment she overlapped with the vision, the world went fully dark behind her. Vibrant colors flew past only to get swallowed by the void. No longer could she feel the presence of her fellow racers behind. Absolutely nothing escaped that void behind her.

For the first time in her life, Agnes Tachyon was facing the truly unknown.

What lay past the potential, no, the limits of umamusume? She told herself she would be the one to discover it. She would be the one to explore it, to sacrifice herself for the new era of runners. Now? The very discovery she made threatened to overtake her, to consume her like the colors and equations before.

For the first time in her life, Agnes Tachyon— truly felt fear.

She had felt fear many times before, but always managed to hide it away under a lying smirk. She was confident in her abilities and in the calculations she made. But now as she pushed further beyond, the void only grew larger. Overtaking more of her sight. Even the vision that she was chasing, that she had passed moments ago, was swallowed whole.

Under the colors that blanketed her figure, that mad smile was wiped away, replaced with a silent cry of pure horror as she ran for her life. Even the finish line streaked its way into the dark abyss, no way to tell when she could stop.

So she kept running.

 


 

Even as the blinding glow crossed the finish post, Agnes Tachyon did not slow down. Murmurs of concern rippled through the crowd, watching her continue ripping into the turf at full speed for a full fourteen seconds. They watched as she finally started to slow, the glow receding as she did.

 


 

Watching the turf curve to the right had told her the race was over. She could slow down, let herself be consumed. She wouldn’t let the abyss take her before her experiment reached its conclusion. And yet, her urge to run was overpowering, as she followed the curve of the turf, legs screaming in agony from the extra distance they were running.

At the end of the first corner, her stamina fully gave out, her legs slowing. The void relented, shrinking back down into the depths it had come from. Ragged breaths shook her entire frame as she composed herself, the terror of being consumed slowly dissipating into the air. A smirk returned to her face, as her fellow racers caught up to her.

 

The next day, Agnes Tachyon announced her indefinite hiatus from racing.

Notes:

hello!! so this is my first fanfic— ever. i've written some small stuff before but never based on some existing media so i hope it turned out well enough!!

i got the idea for this one day when i was on the way to school and listening to the boane ost i heard a plane fly overhead which lead me to thinking about sonic booms and how when you're traveling faster than the speed of sound you'd only be able to hear sounds that are coming from an area in front of you. so i wondered what if something similar happened to the vision of an umamusume as they ran faster past their limits and then the connection to tachyons (the particle) traveling faster than the speed of light and one thing led to another and next thing i knew tachyon (the uma) experienced the void™ torture chamber

big inspiration for me is the last part of the 2001 satsuki sho as depicted in boane. i really really REALLY like the entirety of the art direction of that scene. it gives me chills every time i watch it. the soundtrack only amplifies it more with how it makes you feel so uneasy and anxious watching the entire scene i love it i love it so much

anyway there is Alot of thought going into this fic (this is loosely based on certain real life phenomena) and if i talked about Everything i was considering and also everything i left out for Artistic License it'd be longer than the fic itself.

there Might be a part 2 to this... if i can figure out who else i can throw into the torture chamber in the same way i threw tachy in there. i have One idea but im thinkin it out rn. alternatively i could also focus on the build-up to and the aftermath of this fic. cook some more worldbuilding around. see how tachy copes with her discovery. fun ideas dont you think?