The singer-songwriter Joan Manuel Serrat plays the role of a young fisherman named Joan from Ibiza (Eivissa) who falls hopelessly in love about a beautiful English tourist and it leaves everything to follow her to London, where he is introduced to the hippie world.

The frog test confirms Julita is pregnant. This is usually a great news. In this case, no. She is a victim of premarital sex, and he, Paco, a mechanic who, according to some theories of French biologist, explained by a podiatrist friend, will not be liable. Don Ramiro, the father of Julia, is a liberal-minded man, but when his daughter tells him that she will have a son who will not parent, seeking the solution of fatherhood in his gun regulation.