The user kneads chakra inside their body and converts it into fire, which is then expelled from the mouth in a large stream. The blaze is drawn into a spiral when the user expands their stomach, which will engulf the opponent in a massive vortex, giving them no option to escape, leaving them to suffer and burn. If needed, Kamui can be used to draw out a whirlwind, aiding the formation of the fiery spiral.
- Fourth Databook, page 239
- Naruto chapter 628, page 2
- Naruto chapter 600, pages 17-18