Set in Japan

any book by Allen Say

The Cat who Went to Heaven
middle grade novel
Aladdin
Elizabeth Coatsworth

Haiku 
poetry
Tuttle Publishing
Patricia Donegan

J-Boys, Kazuo's World, Tokyo 1965
middle grade historical fiction
Stone Bridge Press
Shogo Oketani, author
website
Avery Fischer Udagawa, translator

Miki's First Errand
picture book
RIC Publications
Yoriko Tsutsui, author
Akiko Hayashi, illustrator
Richard McNamara, translator

Playing for Papa
picture book
Topka
Suzanne Kamata, author
Yuka Hamano, illustrator

Sadako and the Thousand Cranes
middle grade novel
Puffin
Eleanor Coerr

The Singing Clams
picture book
Kane/Miller Book Publishing
Naomi Kojima, author-illustrator

Wakame Gatherers
picture book
Shens Books
Holly Thompson, author
Kazumi Wilds, illustrator

Young Adult

Moribito: Guardian of the Spirit
young adult fantasy
Arthur A. Levine Books
Naoko Uehashi, author
Cathy Hirano, translator
reference

Orchards
young adult verse novel
Delacorte
Holly Thompson

Samurai Awakening
young adult fantasy
Tuttle Publishing
Benjamin Martin