In an imaginary world, a protracted war broke out between the Kingdom of Revam and the Heavenly Empire Army. Prince Carlo of Revam led his army to fight against the enemy, always hoping that the war would end soon so that he could marry his fiancée Fana (voiced by Taketomi Seika) who was far away in Santa Martilia. In order to defeat Revam's morale, the Heavenly Empire sent troops to attack Santa Martilia in order to kill Fana. In order to protect Fana, the Empire decided to send her to Prince Carlo, but the long journey was heavily guarded by the Heavenly Empire and full of dangers. After a setback, the Empire entrusted this important task to Karino Charles (voiced by Kamiki Ryunosuke), a mercenary of humble origin, who would fly the most advanced reconnaissance aircraft alone to escort Fana to her destination. In just three days of travel, their hearts quietly changed... This film is adapted from the original work of Inumura Koroku.