In the cutthroat world of Japanese horse racing, the elite thoroughbred Diamond Foot dominates the track, undefeated since his debut and celebrated as a living legend of superior bloodlines. In the shadow of that same stable, however, stands another horse named My Lord, dismissed by everyone as a worthless nag with no future and no expectations placed upon him. When the young jockey Yotsuma rides My Lord in a low-grade race, he is struck by an almost feral fighting spirit and relentless tenacity hidden beneath the horse's unassuming exterior. Recognizing that My Lord possesses a raw, untapped potential that others have overlooked, Yotsuma commits himself to training the horse from the ground up, determined to transform him into a true contender. The manga follows Yotsuma and My Lord as they navigate the brutal realities of the racing industry, where pedigree often dictates destiny, where defeat can lead to being culled from the record entirely, and where the bond between rider and horse is tested against impossible odds. It is an underdog story rooted in the gritty, old-fashioned atmosphere of the stables and the backstretch, focusing on the fierce competition, the gamble of every race, and the defiant will to rise from the bottom against the backdrop of a sport that rewards only winners.