She rejected her grandfather's request to study medicine and inherit the clinic in the future. With the support of her father and mother, Higashino Chihiro resolutely gave up further studies, embarked on the path of becoming a central trainer, and set off for Tokyo.And here is the stage for the strongest horse racing girls from all over Japan to pursue their dreams. Aiming at the Shining Series, they will sign a contract with trainers they think are suitable for them and work together towards victory.Coming to such a competitive place, what kind of horse girls will Higashino Chihiro meet, get to know, and become friends with?What kind of story will happen between him, her, and them?