- Name: Demon Fox Rasengan (妖狐螺旋丸, Yōko Rasengan; Viz "Nine-Tailed Rasengan"; Literally meaning "Demon Fox Spiraling Sphere"; Games "Vermilion Rasengan")
- Type: Unknown rank, Offensive, Short range (0-5m)
- User: Naruto Uzumaki (One-Tailed Transformation)
- Debut (Anime): Naruto Episode 134
- Debut (Manga): Chapter 232
Naruto forms the Rasengan while in his one-tailed form. He uses the Nine-Tailed Demon Fox's chakra shield as a shell and molds his chakra within it, allowing him to create a Rasengan without the need for shadow clones. In the anime, this Rasengan is blue with a red outer shell. In the second movie and the various video games, the Rasengan is red. It is also much more powerful than the usual Rasengan, due to the demon fox's chakra.