Following the Master's Shadow

is episode 153 of the Naruto: Shippuden anime.

Synopsis
Naruto is in saddened and thinks about his time with Jiraiya. Fukusaku reveals the code that Jiraiya left him on his back and tells Tsunade that he has the body of one of Pain's Paths. After hearing this, Tsunade orders an autopsy to be performed on the body, and decryption of the code. Iruka meets with Naruto again, and cheers him up. Unable to help with the decryption of the code, Shikamaru decides to visit Naruto. Together with Naruto, they go out to visit Kurenai. After that, Shikamaru manages to cheer up Naruto, and Naruto decides to help decode the message.