Official is not the same thing as canon. That just means it has the rights to the licensee. GT is official but not canon, or do you think GT is canon too?Viz Media is bringing a host of Naruto goodies to North America and in English starting later this year! The two big ones many fans have been curious about are the Uzumaki Naruto illustration book, which was the 114-page art book with visual creations by Naruto series creator, Masashi Kishimoto.
The second is the series of Naruto epilogue books, which are titled Naruto Hidan (Naruto Secret) in Japan. In case you may not remember, the Naruto Secret series of books are official stories that take place after Naruto manga chapter 699, but before Naruto manga chapter 700. These are books, not manga, that have pages upon pages of text only. Similar to the Harry Potter series of books, but not as long. Generally each book in the Naruto Secret series is about 200-300 pages.
Also just because it was published in WSJ doesn't make it canon. This was also in WSJ but isn't canon.
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