Note that this is Uma Musume fanfiction, not actual Uma Musume.

Open your eyes and enter the world of Equestrian Girls. Born as Rudolph's symbolic sister, my goal is to witness the journey of all horses in eternity. I am fortunate to have so many horses, and I hope to create an era where all Equestrian Girls can be happy.

...

Every horse girl has her own wish, every horse has her own story, and every era has its own pride. Records are not static limits; constantly surpassing them is the inevitable choice. Life may be short, but being remembered is eternal—this is the time of eternity.

Aoshima Ryusuke never imagined he'd encounter the burgeoning world of Uma Musume. While the world knows of its invincibility, little is known about its inherent challenges. This presents a golden opportunity for him; becoming a legendary trainer requires overcoming this hurdle. Even the legendary Horse King has regrets. He'll eventually carve out a name for himself in the world of Uma Musume, not just domestically, but also internationally!