Three girls named Marta, Julia, and Paula are doing an experiment in the laboratory when Paula suggests going to buy cookies. Marta forgets an open red paint container, so they rush to close it before something bad happens. Smoke starts coming from the container, and a frog-like creature appears. The creature introduces itself as Piruleta and thinks the girls are enemies at first, but they clarify they can be friends. They go buy cookies and after eating them, Piruleta has to return home.