Naruto Shippuden

Ah, the Medicine of Youth (9x11)

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Back before Rock Lee had his surgery, Naruto, after donning the suit given to him by Guy, set out on a mission with Sakura and Ino to obtain a special flower which was a necessary ingredient for Lee's medicine. When Naruto picked one of the flowers, however, he had to face a strange technique that had taken on the form of Gaara.