There was Kakashi Hiden (The Hidden Legend of Kakashi), Shikamaru Hiden, Akatsuki Hiden, Gaara Hiden, Sakura Hiden, Konoha Hiden, Sasuke Shinden, and two books on Itachi.
The first book is titled The Naruto Shinden (The New Legend of Naruto) and will be released in Japan on May 2, 2018.
Shuiesha, the publisher behind many great manga series such as Naruto, Dragon Ball, One Piece, and My Hero Academia, has announced three new books in the Naruto series.
These aren’t the first books based on the Naruto series.