The world of horse girls has been captivated by the intense rivalries and heartwarming stories of “Uma Musume: Cinderella Gray,” an anime adaptation that brings the popular manga to life. As fans delve deeper into the narrative of Oguri Cap, Episode 21 marks a pivotal moment, delivering a high-stakes race that has been building with fervent anticipation. This episode, which premiered on December 7, 2025, plunges viewers into the dramatic grandeur of the Arima Kinen, a race brimming with emotional weight and fierce competition.
The Road to the Arima Kinen: A Split-Cour Journey
“Uma Musume: Cinderella Gray” began its anime broadcast in April 2025, introducing audiences to Oguri Cap and her journey to become a legendary horse girl. The series was structured as a split-cour anime, with the first 13 episodes airing from April to June 2025. The narrative picked up pace with its second cour, which commenced in October 2025 and is slated to conclude in December 2025, bringing the total episode count to 23. Episode 21 falls deep within this concluding cour, setting the stage for the series’ ultimate climax.
Episode 21: The Arima Kinen — Tamamo Cross’s Final Dash
Episode 21 zeroes in on the highly anticipated GI “Arima Kinen” race. This event carries immense significance, as it is declared to be Tamamo Cross’s final race in the Twinkle Series. The episode meticulously builds the dramatic tension leading up to the starting gun, highlighting the mental and emotional states of the key competitors.
Oguri Cap’s Burning Determination
At the heart of Episode 21 is Oguri Cap’s renewed challenge against her formidable rival, Tamamo Cross. Having faced previous defeats and grappling with her own confidence, Oguri enters the Arima Kinen with an overwhelming desire to secure victory in what may be her last encounter with Tamamo. The episode explores Oguri’s breakthrough, showcasing her evolution beyond merely defining herself by racing against Tamamo, now seeking to continue her relentless pursuit of victory past all her rivals.
Tamamo Cross’s Emotional Farewell
For Tamamo Cross, the Arima Kinen represents a poignant farewell. Accompanied by her trainer, Komiyama, Tamamo steps onto the track, reflecting on their journey together. The episode skillfully portrays the emotional stakes for Tamamo, even as her precise reasons for retirement remain a clever, albeit sometimes frustrating, narrative mystery for the audience. Her final confrontation with Oguri Cap is depicted as a deeply personal and career-defining moment.
A Field of Elite Contenders
Beyond the central rivalry, the Arima Kinen features a strong lineup of other top Umamusume. Competitors such as Dicta Striker and Super Creek are prominently featured, each contributing to the intense atmosphere of the race. The episode gives these significant characters their moments in the lead-up, reinforcing their personal stakes and the unpredictable nature of horse racing. The anime emphasizes that in any competition, victory ultimately goes to the one who earns it, regardless of prior frontrunner status or external expectations.
Where to Catch the Race
Fans eager to witness the thrilling events of “Uma Musume: Cinderella Gray” can stream new episodes on platforms such as Amazon Prime Video and the It’s Anime YouTube channel in various regions, including the US, Canada, Mexico, the UK, Ireland, and Australia. The anime is also available with English, Portuguese, and Spanish subtitles. For viewers in Central America, Anime Onegai provides streaming access, while ADN covers France, Belgium, Monaco, Luxembourg, Germany, Austria, Liechtenstein, Andorra, and German-speaking parts of Switzerland and Alto Adige. Previous seasons of “Uma Musume: Pretty Derby” are available on Crunchyroll.
Episode 21, with its focus on the Arima Kinen, serves as a testament to the compelling storytelling and character development that defines “Uma Musume: Cinderella Gray,” solidifying its place as a standout in the anime landscape of 2025.
