The Konoha Cryptanalysis Team, led by Shikamaru, struggles to decipher the numbers Jiraiya wrote on Fukasaku's back. Naruto realizes that the first "9" is actually the Katakana character "ta" (タ) , a handwriting quirk he recognized from Jiraiya's "Icha Icha" (Makeout) novels.
Recognizing that Naruto needs more power to face Pain, Fukasaku invites him to Mount Myoboku to learn Sage Mode . Naruto accepts, driven by his desire to honor his late master and protect the village. Trivia and Production Notes Naruto Shippuden Episode 154
This revelation confirms Jiraiya's suspicion that none of the Six Paths of Pain is the actual Nagato; they are puppets being controlled from elsewhere. The Konoha Cryptanalysis Team, led by Shikamaru, struggles