Débora is an advertiser who has always put her career above her love life. Work and love mix when she runs a campaign for Valentine's Day, whose client is her ex-boyfriend, who was dumped by her in a humiliating way.
Guida, a sweet lady who has been working as an archivist at a Courthouse for 30 years, has her routine changed when she sees a newspaper ad about life drawing classes in a cultural center of the city.
This is the story of Hector, a boy who is kicked out of his band because they think he is not cool enough. On his way home, upset about the happening, he falls in a hole and ends up in an underground world, inhabited by many strange creatures. Although it is in this weird place that he is going to find everything he was looking for: true friends and a rock'n'roll band that doesn't care about stereotypes, only the passion for music. The Under-Undergrounds, together, will have lots of fun adventures trying to help Hector find his way back home. Tolerance, diversity, companionship and self-knowledge are values that our "Rock Star hero" will learn in order to be respected and loved by the "Undergrounders".