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.David Boyd holds a master’s degree from the University of Tokyo and is currently a Ph.D. candidate at Princeton University. His translations have appeared in Monkey Business International, Granta, and Words Without Borders, among other publications.

"In this Japanese import, the winsome, bike-riding twins from Chirri & Chirra in the Tall Grass (2017) are back for another gently surreal adventure... The twins are identical, with black pageboys, dot eyes, pudgy, rosy cheeks, and Mona Lisa smiles; their delight in the wonders they encounter is pure, unquestioning, and totally infectious. Another charmer." —Kirkus Reviews"This Japanese import is sweetly magical and perfectly in tune with children’s acceptance of the fantastic.Smudgy colored-pencil illustrations are aglow with light and color, whimsically whisking readers alongwith the rosy-cheeked twins." —Booklist★ "Another delightful adventure with the adorable twins Chirri and Chirra. ... The gorgeous, fresh colored pencil drawings portray a world of harmony between the girls and the animals. The animals have a fairy-like quality that is very appealing." —Stephanie Tournas, Youth Services Book Review”A soft, sherbet-hued realm of kindly animals, cozy dens and delicious edible treats awaits in “Chirri & Chirra, Underground” …Like the other Chirri and Chirra books, this one will earn rapturous scrutiny from readers ages 3-8.” —Meghan Cox Gurdon, The Wall Street Journal"unique and highly recommended..." —The Midwest Book Review"The soft-edged illustrations in colored pencils, pastels, and crayons are filled with details that will have readers wanting to pause and take a closer look." —School Library Journal, Lucia Acosta, Children’s Literature Specialist, Princeton, NJ