Seventy years after the disappearance of the Yufang, Kate's brother Allen is searching for evidence, but comes under attack and his aeroplane is shot down. Meanwhile, Kylie and Kate test a cheaper fuel from Standon Oil Company for Natsuo, but they find that it is inferior. Kate requests a day off, and visits the crippled Allen in hospital where Kylie and Chika meet him for the first time. Later, Adolfo and Fernando of the Nazarin Squadron, visit the small oil well and refinery at Nanko which supplies high quality gasoline...