Ana and her classmates are being bullied. Going to school used to be fun, but it's turned into a nightmare ever since Emma arrived. She's mean and bossy, and Ana is now the target of her bullying. Ana feels sick, she doesn't want to eat and she's now silent instead of her usual cheerful self.

Preschool teacher and author Pilar Serrano tells a story of teamwork and bravery based on her personal experience with her students at school. A necessary book, and a tool to deal with bullying.