During the search, it is revealed that Orochimaru wishes to train Sasuke because of his powerful genetic heritage, the Sharingan. After Sasuke attempts and fails to kill his older brother Itachi when he showed up in Konoha to kidnap Naruto, he joins Orochimaru, hoping to gain from him the strength needed to kill Itachi. The story takes a turn when Sasuke leaves the Konoha village and when Tsunade finds out, she sends a group of ninja, including Naruto, to retrieve Sasuke, but Naruto is unable to persuade or force him to come back. Naruto and Sakura do not give up on Sasuke: Naruto leaves Konoha to receive training from Jiraiya to prepare himself for the next time he encounters Sasuke, while Sakura becomes Tsunade's apprentice.