Rosita Pie is a young mare living on the small frontier town of Villa del pony, she lives a normal life as the daughter of the town's only innkeeper, until, one fateful day a notorious bandit by the name of Arcoiris Veloz barges into the tavern followed by a dozen of hostile bandit ponies, Arcoiris has stolen something from the evil and fabulous crime lord Rareza, and Rosita is forced down the path of adventure as she discovers the magic of Mexico.