Born in Tokyo, Japan, Kaya Doi graduated with a degree in design from Tokyo Zokei University. She got her start in picture books by attending the Atosaki Juku Workshop, held at a Tokyo bookshop specializing in picture books. Since then she has produced numerous picture books featuring her softly styled, color-pencil drawings. She now lives in Chiba Prefecture and maintains a strong interest in environmental and animal welfare issues. Since the earthquake of 2011 she has been active in recovery and shelter efforts for abandoned pets.