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?

Inari Kagura, a young girl from China who died from overwork, had just awakened in a remote shrine and, after a desperate escape from a sudden fire, collapsed on the doorstep of the Symbol family. Lacking the system unique to time travelers, she was penniless, powerless, and lacked even a usable identity. Her body, now only eleven years old and too timid to accept a part-time job, forced her to accept the old Symbol family's offer of a maid position to survive. "This world isn't right. I should have listened to my bestie and gone to see Uma Musume..." In the student dormitory in Tresen, looking at herself in the mirror, now transformed into a ponygirl, Inari Kagura sighed helplessly, feeling uncertain about her future. On the bright side, at least a maid's duties didn't involve any strange tasks, nor did she face the kind of shrewd young masters who would demand your services by name. "Ms. Eclipse, I think people should still look up..." Looking at the words that suddenly appeared out of thin air on the mirror, Inari Kagura felt even more complicated. And, is there really nothing?

Many years later, when he receives the "Lifetime Achievement Award", Yasui Makoto will recall the afternoon when he was knocked 10 meters away by a horse racing girl...

At the time, he had only been licensed as a Central Trainer for a few months, and because he seemed to lack experience, he was rejected by many horse girls.

After being rejected by a horse racing girl again, he was probably a little distracted. When he was crossing the road and waiting for the red light, he saw a child almost being hit. He rushed forward without thinking too much.

The child was rescued by him.

He was knocked away.

Not being hit by a car.

Instead, he was knocked away by a horse girl with short black hair, red eyes, and a black tail.

In order to meet the assessment requirements, he secretly trained himself based on his past life experience at a very young age.

Although he was hit while distracted, he adjusted his posture in time and was not seriously injured.

But the horse girl was obviously terrified.

“I’m so sorry! Are you not hurt…?!”

"My name is Northern Xuanju! I'm a new student at Central Tresen Academy this year! Please take care of me!

"I, I...anyway, I, I...I will be responsible for you to the end!"

At that time, the "horse racing girl" named "Northern Black Horse" said in panic.

[Some of the Uma Girls' identities and professions have been modified, and the world view has been expanded. Other than that, it is consistent with historical facts and will not affect the viewing experience of the original fans.]

[If you haven't read the original work, just treat it as sports competition + campus life]

[In the early stage, the northern black colt will join the team in the later stage of the Spring and Autumn Division. During this period, other famous horses will be considered, such as Xingmu and Su Daji]