Diego Costa is 42 years old, he is a deliveryman in the family fishmonger and leads an irresponsible and blundering teenage life. While his partner Elsa tells him that she is pregnant, her past resurfaces. 20 years earlier, he made numerous donations in a sperm bank under the pseudonym Fonzy: he now discovers that he is the father of 533 children, 142 of whom wish to know who their biological father is.