Rejecting her grandfather's request to study medicine and inherit the clinic, and with the support of her father and mother, Chihiro Higashino resolutely forgoes further studies and embarks on the path to becoming a central trainer, heading for Tokyo. Here, the strongest horse racing girls from across Japan gather to pursue their dreams. Aiming for the Shining Series, they sign contracts with trainers they find a good match for, striving together for victory. In such a competitive arena, what kind of horse girls will Chihiro Higashino meet, get to know, and become close friends with? What kind of stories will unfold between him, her, and the rest of them?

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.

This is a world where horse racing has replaced traditional horse racing. In the summer of 1985, carrying strange memories, Takeda Makoto takes over his family's heavily indebted horse racing club. The Emperor's reign, at its zenith, is drawing to a close, and the Heisei Three have yet to begin their careers. From the world stage to the regional and central stages, horse racing girls of exceptional talent bloom in abundance. Tamamo Cross, a horse racing girl, becomes the hope for the Takeda family's revival. This is her story, and their story. In the void between the Emperor and the Heisei Three, in an era unknown to anyone, a generation known as the cursed generation, those girls who run for their dreams will encounter different endings.

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!