Below you will find the proper links to my fic or 'book' as you call it here for 'Silent Guardians' which I wrote many moons ago (aka 2015) The end of the 4th war had Naruto and Shikamaru as the only survivors, Kurama feeling the two fading acted fast, sent them back to their Genin days to make sure the war never came to pass. Time Travel AU!