Kimiko Aman is one of Japan's leading children's book authors and her gentle fantasy tales are loved by all generations. Her books have won awards such as the Noma Children's Literature Award, the Shogakukan Literature Award, and—for this book—the Japan Picture Book Award. She lives in Kyoto, Japan.
Komako Sakai has illustrated numerous award-winning books for children, many of which have been published in the United States, including Emily's Balloon. Her illustrations have garnered such awards as the Biennial of Illustrations Bratislava Golden Apple and the Nati per Leggere. She lives in Tokyo, Japan.