Famous racehorses that have left behind worthy legacies, unique as they can be, are reincarnated as horse girls in a parallel world. In this life, they start their journey anew as they continue to race and perhaps relive the success they once lived through. Aspiring to become the best racehorse in Japan, a horse girl named Special Week moves to Tokyo to enroll in the Tracen Academy—an institution that nurtures horse girls like her to become better racers. There, Special Week witnesses the sophisticated running style of Silence Suzuka and is inspired to become a racer like her. Shortly after, Special Week finds herself recruited into Silence Suzuka's team, Spica. From there, she begins her path to the top—one lap at a time.
Within the horse-racing world, the horse girls of Team Spica have been gaining popularity as they continue to rack up victories. The one receiving the most attention in the group is Toukai Teiou, known for her cheerful personality and exceptional running skills. Teiou aims to become an undefeated Triple Crown horse girl by winning all three G1 races consecutively, a feat that has not been accomplished since the legendary Symboli Rudolf managed to do so many years ago. On her path to obtaining the Triple Crown, Teiou is met with many challenges, encountering both old and new rivals. Amidst her fierce rivalries, however, Teiou is soon confronted with decisions that will leave a huge impact on her very own racing career.
Since childhood, horse girls Kitasan Black and Satono Diamond have admired and aspired to be like their fellow horse girl named Toukai Teiou. Chasing their dreams, they enroll in Tracen Academy, an institution dedicated to training horse girls and preparing them for legendary races. Soon after, Kitasan Black lands on Team Spica, the same team as Teiou. Beaming with motivation, she remains undefeated until she fails to win her first Grade 1 (G1) race—the most prestigious type of race in the league—but she is determined to unleash her true potential as a horse girl. Meanwhile, Satono Diamond comes from a long line of horse girls who, despite sporting incredible running prowess, have never won a G1 race. It is up to her to finally break this curse and bring the Satono clan the glory it deserves.
