Nestled in the sleepy countryside lies Kasamatsu Tracen Academy. Jo Kitahara, a trainer, can't help but bemoan the state of regional races compared to the star-studded national scene. But one day, as he passively watches the newest batch of racers practice, he spots an ashen-haired Umamusume. After seeing her stunning racing form, Jo Kitahara is convinced—at long last, he's found a star.

Oguri Cap and Belno Light are officially scouted by Jo Kitahara. Seeing as a racer needs to belong to a team in order to race, Oguri Cap accepts and begins training for her debut race. When the day arrives, she finds the student hailed as their generation's ace—Fujimasa March—waiting for her...

Up until now, Oguri Cap has simply run because she can, but after her heated race with Fujimasa March, her heart wells with a new, bitter emotion. As Oguri Cap and her team ensure she's properly prepared for her next race, another opponent shows her face: Norn Ace. Annoyed by Oguri Cap, Norn Ace's friends propose a certain "strategy" to her...

The day of the Junior Crown is here, and Oguri Cap and Fujimasa March make good on the promise they made at Mt. Kinka to enter. While Oguri Cap had no answer when Fujimasa March asked her for her goal back then, her aspirations will surely take shape during this race with her rival.

Oguri Cap and the rest of her team make their way to Chukyo Racecourse for the Chukyo Hai, but Kitahara can't shake Musaka's ominous words from his mind. Brows furrowed, he heads for the stands, only to discover Symboli Rudolf and Maruzensky have come to observe the race.

After Symboli Rudolf offers his trainee a place in the Twinkle Series, Kitahara approaches a reluctant Oguri Cap with a wager—if she wins the Gold Junior, she'll transfer to the nationals; otherwise, they'll aim for the Tokai Derby. As she heads into the race, Oguri Cap remains conflicted. She wants to give her all in her long-awaited battle against March, but...

Musaka gives Tracen Academy's two newest students—Oguri Cap and Belno Light—a tour of the expansive campus. Afterwards, Oguri Cap comes face to face with her new classmates—and potential rivals. As class begins, the teacher explains the goal of many of her contemporaries, the G1 Classic Triple Crown. There's just one problem...

Oguri Cap's transfer from Kasamatsu has unfortunately overlapped with the registration deadline for the Classic races. Eager to show Symboli Rudolf she has what it takes to take on these races, she sets her sights on the G3 Pegasus Stakes. But standing in her way is a racer with four consecutive wins under her belt...

Symboli Rudolf witnesses Oguri Cap's might firsthand—the no-name racer from the boonies wipes the floor with even the strong national racers. In her, Symboli Rudolf sees a star capable of setting the Twinkle Series alight. But should she use her authority to advocate for a miracle at the Japan Derby, or should she remain loyal to the rules?

Ultimately, Oguri Cap is unable to enter the Japanese Derby, which means she needs a new racing goal. Hoping to inspire Oguri Cap, Musaka takes her and Belno Light to see the Takarazuka Kinen, a Grand Prix race where the lineup is decided by a fan poll. There, Oguri Cap witnesses the racer currently dominating the Twinkle Series.

Musaka declares that if Oguri Cap wants to take on Tamamo Cross in the fall Tenno Sho, she has to win the Mainichi Okan. A task easier said than done, as Oguri Cap's winning streak means all her rivals' eyes are on her. This year's Mainichi Okan is shaping up to be a ten-versus-one race...

At last, the day of the fall Tenno Sho arrives, and with it, the first clash between the two ashen-haired Umamusume, Tamamo Cross and Oguri Cap. Hoping to surpass the top racer and become the best in all of Japan, Oguri Cap steps onto the turf. Although Tamamo Cross holds a similar dream, there's a special someone in her heart as she enters the course.

The crowd is on the edge of their seats as the racers enter the homestretch of the fall Tenno Sho. With 400 meters remaining, each runner musters their last strength. With Oguri Cap on her tail, Tamamo Cross feels the pressure. As exhaustion creeps in, her past flashes before her eyes. Her loved ones in her heart, Tamamo Cross breaks her limits and enters a zone beyond her rivals...

Vowing to win against Tamamo Cross after her fall Tenno Sho defeat, Oguri Cap throws herself into training. Her classmates soon inquire about her next race, prompting Dicta Striker to challenge her directly. Dicta Striker insists that Oguri Cap compete in the same race as her, aiming to prove that focusing solely on Tamamo Cross is a mistake. Ultimately, Oguri Cap decides her next race will be…

Fumino Nase, a trainer already hailed as a genius at her young age, declares her intent to enter her trainee, Super Creek, in the Kikuka Sho. Among their competition is the winner of the Satsuki Sho, Yaeno Muteki. In this battle across 3,000 meters, only one racer can win. Will it be one of these two?

The international G1 event, the Japan Cup, is fast approaching. One by one, participating Umamusume trickle into Japan from around the world, including the Italian champion of the Prix de l'Arc de Triomphe, Toni Bianca. Ever vigilant, Musaka sends Belno Light on an undercover mission to learn all she can about their opponents. Among these racers, Belno Light happens upon a particularly odd one...

Stepping onto the turf at the Japan Cup, Oguri Cap and Tamamo Cross are reunited for the first time since the fall Tenno Sho. Face to face with her rival, Oguri Cap declares that she will win the Japan Cup. As each racer reaffirms their hopes for the race, an ominous smile spreads across Obey Your Master's face…

There once was an earnest Umamusume who gave racing her all, but had nothing to show for it. Still, she craved victory more than any other, so one day, she made a choice. She'd bet everything on a single race across the Pacific. In order to win there, she'd don the joker's mask and sacrifice everything—even herself—to become a true wild card.

Outclassed by Tamamo Cross and Obey Your Master's use of the Zone, Oguri Cap suffers another bitter defeat at the Japan Cup. Her confidence takes a hit as she feels the gap between her and Tamamo Cross now more than ever, and she begins to wonder if she'll ever best her rival. That's when Musaka decides to rally a task force to reignite Oguri Cap's fighting spirit.

Oguri Cap, Dicta Striker, Super Creek, and the other Arima Kinen participants have gathered for a press conference regarding the race. Tamamo Cross arrives late with a solumn expression. She pulls Oguri Cap aside, revealing that she's made a very difficult decision... But just how will Oguri Cap react?