Fonzy, the pseudonym under which Diego Costa 20 years ago repeatedly donated sperm to the sperm bank. Today, at 42, he is a deliveryman in a family-owned fishmonger and leads a teenage irresponsible and blundering life. While his wife Elsa learns that she is pregnant, his past resurfaces. Diego discovers he is the father of 533 children, 142 of them want to know who is Fonzy.