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Foaled in 1984, Inari One began his career not in the prestigious Japan Racing Association (JRA), but at Oi Racecourse in the South Kanto circuit.

At the time, horses competing in regional racing were often overlooked compared to JRA horses. However, Inari One quickly demonstrated top-tier talent. He compiled an impressive record on dirt tracks, winning major local races and establishing himself as one of the strongest horses in the region.

His success eventually convinced his connections to take a bold step: transferring him to the JRA, where Japan's best horses competed.

Many regional stars struggled after making the jump to the national stage, let alone from dirt racing to turf racing, but Inari One did the opposite.

After joining the JRA in 1989, he immediately challenged some of the country's strongest competitors. Under jockey legend Yutaka Take, he captured the prestigious Tenno Sho (Spring), proving that a supposed dirt specialist could excel against elite turf runners.

The victory stunned many, but Inari One was not finished. Later that same year, he added the Takarazuka Kinen and the Arima Kinen to his resume, which helped him secure the title of Japanese Horse of the Year.

After retiring from competition in 1990, Inari One entered stud duty. He spent many years as a breeding stallion, although he did not achieve the same level of influence as a sire that he had enjoyed on the racetrack.

Inari One passed away from old age complications on 7 February 2016 at age 31. News of his death prompted an outpouring of tributes remembering his rise from Oi Racecourse to the pinnacle of Japanese racing. 

Years after, Inari One found new popularity through Uma Musume: Pretty Derby, being portrayed as a spirited, energetic horse girl inspired by Edo culture and traditional Japanese festivals. Her vibrant, determined personality reflects the fighting spirit that defined her real-life counterpart.

While many younger fans first encounter Inari One through anime, manga, or video games, the character also serves as a gateway to one of Japanese horse racing's most fascinating stories.
Behind the cheerful Uma Musume stands a real champion who overcame expectations, conquered multiple racing worlds, and etched his name into history.