Alejandra is a young woman who works in the dolphinarium of an amusement park in Mexico City, works with Juanjo and Fina to take care of the dolphins and Keiko, a tender orca, who lives in the park and entertains visitors. Alejandra studies nursing and is part of the team of park coaches. Ernesto Valverde is the owner of the center of attractions, is cruel and has plans in the company of his lawyer to kill Keiko and turn it into tacos, according to the argument of the novel would be more than 38,000 assorted tacos and make a deal with organized crime . Enrique is an independent and handsome young man who adores animals, he is the son of Ernesto Valverde and is against his father's sinister projects. Enrique becomes part of the group of coaches and meets Alejandra, both fall in love and together they face a great series of problems to save Keiko. Keiko becomes the best friend of Alejandra and Enrique, and together the three give smiles and fun to many people.