电次是个背负了父亲遗留下的庞大债务，因此过着极端贫穷生活的少年，他救了恶魔啵奇塔，并与它一起以恶魔猎人的身份斩杀低阶恶魔来换取酬劳。有一天，流氓骗了电次，让他成为一堆恶魔的祭品，电次在临死之际，啵奇塔牺牲自己，把心脏给了他，让他复活并拥有了恶魔的力量，只要一拉位在心脏那边的链子就能发动。之后电次被公安人员看上，因此成为公安的恶魔猎人……

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.