Most of the book was data: mission logs, jutsu classifications, clan bloodlines. But it was the final section, written in a cramped, clinical hand, that Sai had been ordered to destroy. And yet, he could not.
If anyone reads this after I am gone, know this: the Fourth Databook is incomplete. I left out the only stat that matters. It has no rank. It cannot be trained. It is called 'Benevolence.' naruto databook 4
Subject: Uchiha Sasuke (Defected / Rogue / S-rank) Analysis: Emotional attachment to revenge is a critical flaw. Expected outcome: Self-destruction within five years. Recommend termination. Most of the book was data: mission logs,
But below, in a different ink—fresher, shakier, as if written by an old man's hand long after the original analysis—was a single, scratched-out word. Sai held it to the candle. If anyone reads this after I am gone,
"I have spent my life recording the weapons a shinobi can become. But I never recorded the one thing that saved me. The thing Naruto never lost. It is not a jutsu. It is not a bloodline. It is not even a strategy.
"For the next generation. So they know what the darkness learned too late."