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.
When Arihara Tsubasa enters Rigahama Municipal High School and learns that it has no baseball club, she starts up the Girls' Baseball Club on her own. Drawn to the club are girls who have never played baseball before, girls who once played it but quit, and girls who are constantly tackling great challenges. The Rigahama Girls' Baseball Club races through the trials of youth, periodically clashing and quarreling, but supporting each other all the way! And so begins the hottest summer the world has ever known...