REACH OUT AND GRASP GREATNESS. 
Jungle Pocket, known to her close friends as "Pokke," is a free-spirited Umamusume who has proven her dominance in the freestyle racing scene. Overwhelmed by Fuji Kiseki's majestic performance at a graded Twinkle Series race, she resolves to take on the Twinkle Series herself.
 
Shortly after joining the Umamusume training school Tracen Academy, Pokke comes under the wing of Tanabe, a veteran trainer who fostered Fuji Kiseki's talent. Together, they aspire to dominate the Triple Crown series, a set of three races that can only be attempted once in a lifetime. Awaiting them are formidable rivals of Pokke's generation, whose talents surpass even her own.
 
There's Dantsu Flame, whose diligence and determination to win are second to none; Manhattan Cafe, who chases the shadowy silhouette of a "friend" that only she can see; and Agnes Tachyon, a veritable mad scientist seeking to push the very boundaries of what is possible for Umamusume.
 
These four runners take to the track with their very pride, spirit, and souls on the line. Past the finish of their epic clash is a door waiting to be opened—one that leads to the beginning of a new era.
 
"It doesn't matter who stands in my way! I'm gonna be the greatest!" 
(Source: Umamusume: Pretty Derby - Beginning of a New Era Site)