Diego Costa is deliveryman in the family fish market, where he worked with his brothers Enrique and Manuel , and their father Ramon. When Diego learns that his girlfriend Elsa is pregnant , the eternal teenager 42 years discovers he is the sire of 533 children. In the process, he also learned that 142 children were grouped in a class that wants to invalidate the anonymity clause he signed when sperm donations made in the 80s. Panicked , Diego refuses to reveal his identity and asks Quentin, his lawyer friend to help him to assert his rights. Alongside legal action to try to convince their parent to unveil the 142 children of the group to send him an envelope containing each of their profile. Hit by a visceral curiosity , Diego can not help to open the envelope to discover who his children. Without telling anyone , Diego share incognito, to meet them. Intense moments shared with his numerous progeny , cause gradually in Diego, a deep desire for fatherhood. Happy, but in a dilemma , Diego must choose between a normal life with Elsa or accept being the father of 533 children.