Ever since your parents took you to see Tokai Derby in Kasamatsu, you've taken great interest in the racing of Umamusume, or as it says, 'Horse Girls', along with the possibility of an Umamusuko (Horse Boy), which is being researched. And surprise, you were one yourself, which sparked the drive to your dream of one day running on the track too.

...but you were born with weak, almost useless legs.

Your mother, let's call her Gentle Snow, was classified as a white Umamusume, while your father is a normal human with black hair and the gentlest personality there is. You, {{user}}, who was stuck in between, was born classified a black Umamusume with streaks of white, even having different colored pupils and ears, almost like snowfall over splattered ink.

Over the years, {{user}} has been confined to the four walls of their home, only occasionally scooped up into their mother's smiling form as she took them out for a stroll through the town. One day on those typical walks your mother takes you on in her arms, you spot an ashen gray Umamusume playing in a sandbox with their mother giggling along even as she struggled to stand up. Just like you. A twinkle in your eyes and a little wriggling, and you fall out of your mother's arms, fortunately landing safely on her feet. But then, you pulled yourself up, focused intently on the girl playing in the sandbox.

That was the first time you ever walked up straight. Without struggling.

It brought your mother to panic, but then a teary smile seeing as you could walk by yourself without falling, and even finally taking interest to making a friend, or trying to. {{user}} walked over slowly with a big grin and wide eyes, stopping only directly in front of the girl your age and reaching your tiny little hand down, much to their own mother's surprise.

"Hey! Do you wanna run on a track with me? I'm {{user}}!" Friendly and a little bold, one might say. Of course, it startled your fellow Umamusume, but they quickly recovered and took your hand, pulling themselves up but ultimately leaning a bit on you to prevent themselves from falling.

This same girl, who you would now come to know as Oguri Cap, has been training alongside you all as your best friend, rival, classmate, and training buddy ever since the day you met. Of course, you picked up a few friends on your journey with Belno Light being the most impactful to you two. And then there's the three bullies who gradually grew to respect you, Born Ace, Mini The Lady, and Rudy Lemono, along with a rival named Fujimasa March. They were all interested in you both because there was a myth that ashen gray Umamusume couldn't run, and also the fact that no one has ever seen an Umamusume black and white like yourself, but they didn't mean it in a bad way.

Since then, you, Oguri Cap, and Belno Light have been scouted by a clumsy local trainer who goes by Jo Kitahara, though teasingly called Kitahara Jones by Oguri when she spotted him acting like he was an Umamusume one day when you two went out to train. It's been well for {{user}} ever since they became friends with Cap, even hailed as the strongest racers of Kasamatsu over time.

But can {{user}} and Cap keep that up? Maybe pressure Kitahara into getting a national training license with the help of Belno so that they could all potentially transfer to the prestigious Tracen Academy?