Jou Kitahara, a rookie trainer, is in Tokyo where he encounters an unconventional horse girl named Oguri Cap in the town of Kasamatsu. Despite struggling with knee problems as a child, Oguri persevered and discovered a passion for running. In contrast, Fujimasa March, a regional rising star, runs with discipline and tenacity, fueled by a desire for pride and recognition. After racing March, Oguri's perspective changes, and a newfound ambition emerges, driving her to pursue victories beyond Kasamatsu.