Margarita finds out that her mother is pregnant and she is going to have a baby brother. Terrified that her mother and her boyfriend stop loving her, she proposes Rafo to go on vacations with her and Claudia, with the intention of convincing them to let her go live with them. They will, then, embark on a vacation that will end up as a crazy and funny adventure when Margarita meets the older brothers band and discover a pretty well-kept secret.