Rosen was an ace pilot of the Italian Air Force in World War I, but he was transformed into a pig by magic. Although he was transformed into a pig, Rosen continued his old profession and became a bounty hunter, specializing in fighting aerial robbers who committed crimes in the airspace of the Adriatic Sea. Porco Rosso became famous for a while, and the robbers were terrified. In order to deal with Rosen, the gangsters invited the super pilot Kakis. Kakis took advantage of Rosen's engine failure during the duel. When Rosen sent the plane to his old friend Piccolo for repair, he met Piccolo's granddaughter Feo. Feo helped Rosen repair the plane, and the two flew in the blue sky again to fight aerial robbers. At this time, Kakis appeared and fell in love with Feo at first sight. In order to compete for Feo's love, Kakis challenged Rosen to a duel. So the two fought in the blue sky again.