 It earned ¥2.15 billion at the box office, and was the highest-grossing film in Japan in 1989.From March to May 1989, Miyazaki's manga "Hikōtei Jidai" was published in the magazine "".Miyazaki began production on a 45 minute in-flight film for Japan Airlines based on the manga; Suzuki ultimately extended the film into the feature-length film, titled "Porco Rosso", as expectations grew.