Naruto Spin-Off: Rock Lee & His Ninja Pals

Naruto is Lee, Lee is Naruto! / I Dream of Taking the Nine-Tails for a Walk! (1x23)

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Ino catches Naruto and Lee trying to peep on Sakura while she's in the bath, but when she misfires with her Mind-Body Switch jutsu, Lee and Naruto end up swapping bodies!