A drama set in the world of horse racing focusing on lives of owners, jockeys, trainers and gamblers who are all tied to the same horse track.

The star horse of Neko Jockey is Mannen Billy, a prize racer who has lost 30 races in a row despite having an excellent physique and bloodline. To solve the problem, the horse's owner hires a brand new jockey... who, as far as Mannen Billy's trainer can see, is just a normal cat.

Mal Ja who is a part-time worker at a PR company loves all living creatures, but she has experienced a trauma with horses.