Rejecting her grandfather's request to study medicine and inherit the clinic, and with the support of her father and mother, Chihiro Higashino resolutely forgoes further studies and embarks on the path to becoming a central trainer, heading for Tokyo. Here, the strongest horse racing girls from across Japan gather to pursue their dreams. Aiming for the Shining Series, they sign contracts with trainers they find a good match for, striving together for victory. In such a competitive arena, what kind of horse girls will Chihiro Higashino meet, get to know, and become close friends with? What kind of stories will unfold between him, her, and the rest of them?