Keiko Niwa (Ocean Waves, Tales from Earthsea, The Secret World of Arrietty, From Up On Poppy Hill, When Marnie Was There) and Emi Gunji (From Up On Poppy Hill assistant director) wrote the screenplay.
Goro Miyazaki directed the Tales from Earthsea and From Up On Poppy Hill anime films at Studio Ghibli, and also directed the Internationa Emmy-winning Ronja the Robber’s Daughter CG anime series at Polygon Pictures, with assistance by Studio Ghibli.
Satoshi Takebe (From Up On Poppy Hill, Ronja the Robber’s Daughter) composed the music, Koji Kasamatsu directed the sound, and Eriko Kimura directed the dialogue recording.
Yukinori Nakamura (Ghibli Museum’s “Boro the Caterpillar”, Expelled from Paradise) supervised the CG, and Tan Seri served as animation director.