|Fire Release: Rasenshinsei|
|Literal English||Fire Release: Spiraling Nova|
|English anime||Fire Style: Rasen Shinsei|
|Appears in||Anime, Manga|
|Classification||Ninjutsu, Collaboration Techniques|
The Fire Release: Rasenshinsei was created by Arashi Uzumaki and Kira Hatake during their battle with Genda Kurogane, combining Arashi's mastery of the Rasengan and Kira's skill and control with Fire Release ninjutsu.
A collaboration technique variant of the Rasengan in which Kira emits a mass of fire-natured chakra in his palm, which Arashi then shapes and rotates into the form of a Rasengan. Once the basic form is completed, Kira supplies even more chakra to the technique, which Arashi packs into the center, causing it to glow like a star. An excess of chakra flows outward, giving the technique an appearance reminiscent of a spiral galaxy. The technique is so hot that contact with water techniques will generate steam hot enough to severely damage a person's skin.
On contact, the Rasenshinsei's outer shell burns its way through any defenses in its path, which disperses itself in the process, penetrating as deeply into the target as possible to give access to the shining core at the center of the technique, an incredibly dense mass of chakra, which detonates with tremendous force once exposed, flooding the target's entire body and inflicting massive damage from the inside outward. The chakra released is so intense it causes the target's skin to glow, inflicting heat damage on a cellular level. The damage is so severe that Sakura Uzumaki likened it to radiation poisoning.
Like the Rasengan, the Rasenshinsei cannot be thrown, requiring the users use it as a melee weapon and force it into the opponent. As the technique is essentially striking the opponent with a bomb, its use carries significant risk to the user; while Arashi and Kira were thrown back by the initial blast wave, and upon medical examination, their bodies did show trace amounts of the same cellular damage.
- The concussive force of the explosion inside the target's body forces their limbs outward. Coupled with the glowing effect, they resemble the Daimonji of the Japanese festival Gozan no Okuribi, where a large bonfire is lit in the shape of the character 大 (meaning "big" or "great").