sasuke's book wasn't necessary. itachi's books were amazing and gave a new insight into his backstory and really fleshed out his characters inner turmoil much more than in the anime. the English translation had a few doubled words and misspellings but it didn't take anything away from how good it was.

the books looked into alot more than i thought they would and they changed my opinion on the tsukiyomi. the book made me realise that it is probably not a good thing to have happen to the world while during the anime i was confused as to why people opposed it so much