Uma Musume: Pretty Derby is a Japanese multimedia project that includes an anime series, a mobile game, and a manga. The story revolves around Uma Musume, anthropomorphized horse girls who possess the spirit of famous racehorses. These girls compete in a sport called "Twinkle Series", where they race against each other to become the best horse girl in Japan.
The main character, Special Week, is a young horse girl who dreams of becoming the greatest Uma Musume in the world. She enrolls in Tracen Academy, a prestigious school for horse girls, where she trains and competes in races to achieve her goal. Along the way, she forms friendships with other horse girls and faces challenges that test her determination and skills.
Uma Musume: Pretty Derby combines elements of sports, drama, and friendship to create a heartwarming and exciting story about perseverance and friendship. The series has gained a large following in Japan and has been praised for its charming characters and engaging storyline.