After years of not being able to find the books i wanted from Japan, we started importing them ourselves. Finally, we have added them to our website. Many are in Japanese, but some are in english, and others are primarily picture books. Anyways, here they are on the site:
http://www.japaneseknifeimports.com/other-items/books.html
http://www.japaneseknifeimports.com/other-items/books.html