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, the participating Umamusume trickle into Japan from all over 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 with one goal—learn as much as 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 solemn expression. She pulls Oguri Cap aside, revealing that she's made a very difficult decision… But just how will Oguri Cap react?

The Arima Kinen has arrived. As Tamamo Cross and her trainer, Komiyama, brace for her last race, they reminisce about their time together. Meanwhile, Oguri Cap has finally overcome the depression from her greatest rival's imminent departure, replaced by an overwhelming desire to seize victory. With a lineup including Dicta Striker, Super Creek, and many other generational talents, this year's Arima Kinen is shaping up to be an explosive send-off to an incredible year.

Tamamo Cross catches everyone off guard by accelerating in the backstretch instead of the final straight. As Tamamo Cross passes racers one by one, Oguri Cap presses on, ever conscious of Tamamo Cross's looming approach. With her body pushed to the limit, Oguri Cap's mind begins to wander to her past…

Oguri Cap has bested the best and emerged victorious at the Arima Kinen over Tamamo Cross. But when one race ends, another is bound to begin… For now, however, Oguri Cap and company decide to relish the holiday season with a party, reflecting on the past year.