I Am In Naruto

Naruto thought about the destructive power of Bijuu bomb.

"Old man,

"Follow me, Naruto"

After walked around for a few minutes, Naruto looked around this place. He saw a huge forest, surrounded by large wire mesh fences, bearing many signs forbidding entry.

Naruto: "This is creepy"

Hiruzen: "This is Zeroth Training Ground. Be careful. This training ground has a lot of insectivorous plants, wide open plains with few trees and a cliff. the Zeroth Training Ground was originally used for the Chūnin Exams"

Yamato: "But this place is nature preserved, Hokage sama, we can't destroy the ecology in this place"

Hiruzen: "We can restore this place using your Mokuton, Captain Yamato.

Yamato frowned. "This is not easy Hokage sama"

Hiruzen: "For animals around here, I already send someone to migrate them. Let's check."

Hiruzen made a hand seal and then put his hand to the ground "Kuchiyose no Jutsu"

Puff, a monkey King Enma appeared. Enma's body and tail was covered by white fur which protrude from his sleeves and pants. He had long unkempt white hair that reached his back and long sideburns and a goatee. He weared a black suit with mesh armour underneath, over which he wore a sleeveless kimono shirt with white fur trimmings, and markings reminiscent of tiger stripes on it which is held closed by a red sash. Enma also wore a Konoha forehead protector.

Hiruzen: "Enma, Did your monkey soldiers finish to migrate the animals here?"

Enma: "it's a small problem, Sarutobi"

Hiruzen took a ring and gave it to Naruto. Naruto: "Old man, what is it?"

Hiruzen: "it's a ring that First Hokage's ring. It would help Yamato to control you if you are controlling your body when used Kyuubi form"

Naruto put on the ring.

Hiruzen: "Now let's start the battle, Naruto. Yamato, see our battle"

Naruto put some distances from Hiruzen.

Hiruzen felt there was a huge chakra fluctuation from Naruto.

Naruto's eyes changed color to red and his pupils became slit, plus his nails and canine teeth grew longer and sharper. Naruto's hair also grew longer and spikier, and the whisker-like marks on his cheeks widen and thicken, he was surrounded by a layer of red.

"Taju Kage Bunshin no Jutsu" Naruto created 100 clones.

"Friend, charge"

"Okay Boss"

"Let's beat the old man"

Looking at this clones, Hiruzen made a hand seal. "Katon: Karryu Endan"

After kneading chakra, Hiruzen breathed the fire from his mouth. The flames were manipulated into the shape of a dragon and directed to strike the clones from multiple directions. 

Half of the clones were turned to smokes. But then 10 clones appeared near Hiruzen. "Clone Explosion Jutsu" the clone started to detonated.

Hiruzen made a hand seal. "Doton: Doryuheki"

Hiruzen spit out the mud from his mouth, creating the giant mud wall, protecting himself from the explosion.

Suddenly Naruto came out from the ground in front of Hiruzen and gave him uppercut.

"Puff" Naruto kicked a log.

Hiruzen appeared on the top of river.

"Suiton, Suiryudan no Jutsu"

Hiruzen manipulated the water into the shape of dragon, the dragon rushed toward Naruto.

All of Naruto's clones gathered in front of him. "Go, Formation 44"

The clones started to make a wall using their bodies, meanwhile the original Naruto tried to run away from the place.

"Clone Explosion Jutsu"

More than 30 clones detonated their bodies, creating a large explosion, blocking the water dragon.

Hiruzen cried "Enma"

Enma appeared beside Naruto, and punched Naruto hard. His body was as hard as adamantine. After receiving this attack,  Naruto was sent flying.

Naruto tried to stand up, but then he coughed a mouth of blood.

Then 

Naruto formed a dense shroud of chakra around his body. The shroud, a translucent red with bubbles of chakra (reminiscent of boiling liquid) forming all along it. The shroud that encompassed Naruto vaguely resembled Kyuubi; A tail on his butt, paws of chakra form around their hands and, fox ears on his head.

The tails started to grow until he has three tails. Naruto disappeared from his place.

Yamato gulped "He is fast"

Naruto appeared in front of Hiruzen and punched him.