During the search, it is revealed that Orochimaru wishes to train Sasuke because of his powerful genetic heritage, the Sharingan.[iii] After Sasuke attempts and fails to kill his older brother Itachi,[iv] who had 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 village: Tsunade 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.