- Name: Nan no Kaizō, 軟の改造, literally "Soft Physique Modification"
- Type: Hiden, No rank, Supplementary
- Users: Misumi Tsurugi, Orochimaru
Originally developed for spying activities, this technique can be done after some surgery and actual body modification. The user dislocates their joints then controls their softened body with chakra, allowing them to stretch and twist any part of their body at any angle, elongating and even coiling around their opponent. This can also be used to make the user's body more malleable and snakelike. Orochimaru can do this without surgical modification thanks to his various forbidden jutsu. In addition, his version allows him to stretch his body parts well beyond their normal length.