Chirri & Chirra, Underground
(Chirri & Chirra #4)

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 children's books. Since then she has created many picture books featuring her delicate color-pencil drawings. She 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.

Yuki Kaneko was born and educated in Japan. She is a sculptor, a translator, an urban naturalist, and a botanist. She works on New York City's High Line and lives in Brooklyn with her family.