"The Unresisting Heart…!!" (抗えぬ心...!!, Aragaenu kokoro...!!) is chapter 162 of the original Naruto manga.
Summary
Tsunade checks up on an unconscious Naruto. Because of his week-long training, she concludes that he will sleep for several days. Knowing that he hadn't mastered the Rasengan and that he now won't be able to before their deadline, Tsunade leaves. Shizune tries to convince her not to help Orochimaru when they meet the next day. She goes so far as to try fighting Tsunade, but is easily knocked unconscious. As Orochimaru and Kabuto head towards the meeting place Orochimaru, remembering Shizune's earlier actions, sends Kabuto to eliminate her. The next morning Naruto wakes up Shizune, the demon fox within him having healed his injuries faster than usual. She tries to pursue Tsunade but is stopped by Jiraiya, who has been drugged by Tsunade and is having difficulty moving. Seeing Kabuto, he asks Shizune what Orochimaru's arrangement with Tsunade was. At Tanzaku Castle, Tsunade offers to heal Orochimaru's arms if he will promise to leave Konoha alone. He agrees.