Naruto: I'm Nine-Tails and My Host is Kushina Novel

Reincarnated into the Naruto universe as the Nine-Tails, the protagonist discovers himself sealed within Uzumaki Kushina. Unlike the savage beast of legend, he retains complete consciousness, intelligence, and determination to alter the destiny of all tailed beasts. His newfound power challenges the shinobi world's mightiest warriors. Madara admits his legendary Rinnegan fell before the Nine-Tails' strength. Hashirama acknowledges the reversal of their historic dynamic—where he once dominated the Nine-Tails, now he finds himself under its control. Uchiha Mikoto expresses shock at the formidable entity residing within her friend Kushina, who cryptically remarks that each of the Nine-Tails' tails evokes distinct sensations. Rising as the champion of all tailed beasts, the Nine-Tails proclaims their collective defiance, declaring that tailed beasts will never accept enslavement again. Through intellect and power, he fights to reshape their role in the ninja world.