The fanfic is based on an incident somewhere around chapter 330-340. Shikamaru gets little screentime, though, so you could probably just google through http://en.wikipedia.org/wiki/List_of_Naruto_chapters_%28Part_II%29 and http://en.wikipedia.org/wiki/List_of_Naruto_chapters_%28Part_I%29 for ‘Shikamaru’ and read just those chapters, maybe.
(Not that I’d recommend such a procedure. The worse part of Naruto is the fandom and anime. The manga itself is a pretty decent shonen manga.)
The fanfic is based on an incident somewhere around chapter 330-340. Shikamaru gets little screentime, though, so you could probably just google through http://en.wikipedia.org/wiki/List_of_Naruto_chapters_%28Part_II%29 and http://en.wikipedia.org/wiki/List_of_Naruto_chapters_%28Part_I%29 for ‘Shikamaru’ and read just those chapters, maybe.
(Not that I’d recommend such a procedure. The worse part of Naruto is the fandom and anime. The manga itself is a pretty decent shonen manga.)