I don’t read Japanese and you may not either, still I get a kick out of seeing my first book length translation rendered in another language, plus I like how the Japanese design their books.
Mindfulness with Breathing has also been translated into German, Spanish, Italian, Portuguese, Czech, Korean, Russian, and a few other languages.
Further, a different Japanese translator has translated a number of books directly from the Thai originals.
Details about other translations — print and ebook — can be found at www.bia.or.th/en/ and www.suanmokkh.org.