Aris and Tita are two siblings that fight all day long. Aris despises Tita, because she is a girl and Tita despises Aris, because he is a boy. Their parents, unwillingly, make things worse, as they themselves have not learned to respect the opposite sex. One night, after a big fight, Tita wishes that Aris was in her place, so that he can understand what it is like to be a girl. Aris wishes the same thing on Tita, so that she can understand what it is like to be a boy. Their wishes come true, and the two kids take each other's place. So a series of tragicomic situations unfolds, until the children understand what it means to be in someone else's shoes. Little by little they learn to appreciate and respect the opposite sex.