Jungle Pocket, a.k.a. Pokke, is a Umamusume girl who has been running free in freestyle races, aiming to be the strongest. On a whim, Pokke watches a race in the Twinkle Series. She is shocked by Fuji Kiseki's performance in the race, and decides to challenge for the Twinkle Series herself. Pokke enters "Toresen Academy," where Umamusume girls gather, and under the guidance of trainer Tanabe, who raised Fuji Kiseki, she takes on the "Classic Triple Crown Race," a race she is allowed to attempt only once in her lifetime. What awaited him there were rivals of the same generation who were even more talented than Pokke. Dedicated to her work, Dantsu Flame continues to work hard and honestly. Manhattan Cafe, running after a "friend" that only she can see. And Agnes Tachyon, a mad scientist who seeks beyond the possibilities of Umamusume. These Umamusume girls put their pride, their will, and their souls on the line. The hot and fierce battle opens the door to a new era.

走りで最強を目指すと豪語するジャングルポケットは ＜トゥインクル・シリーズ＞でのフジキセキの走りに衝撃を受け、レースの世界に飛び込む。 トレーナーと共にデビューを果たしたジャングルポケットは、 一生に一度しか走れない栄誉あるクラシック三冠レースに挑む。 しかしそこに立ちふさがったのはアグネスタキオンやマンハッタンカフェといった同世代のライバルたちだった。 新時代の扉を開く熱き戦いが、いま始まる——。