the Secret to Becoming a Witch
Written by Iijima Toyoko, Illustrated by Yamamura Koji
Kin-No-Hoshi SHA
1st edition: : 2023.09
Written by Tominaga Mai, Illustrated by Yamamura Koji
Sekaibunka Holdings
1st edition: 2023.07.15
"Kudamono Damono"
2013 Ehon no Iriguchi selection for 2 years olds July issue
Text: Ishizu Chihiro, Illustration: Yamamura Koji
Fukuinkan Shoten Publishers
1st edition: 2013.07.01
4th place: MOE Children's Picture Book Store Award