HT5557: iBooks: Frequently Asked Questions (FAQ) about iBooks featuresLearn about iBooks: Frequently Asked Questions (FAQ) about iBooks features
Currently Being ModeratedNov 15, 2012 8:45 AM (in response to Morryespos)
The Japanese dictionary is for all of iOS 6, not just iBooks.
The iBookstore has only just begun to support Japanese books, so it will take some time before you can find them.
Try other sources of ebooks which also provided free ereaders for iOS, such as Kindle, Nook, Kobo, or Googlebooks.