NARUTO: Demon's rebirth in Naruto

Mizuki snarled, launching a kunai toward Naruto, intending to finish him off in one swift motion.

Instinctively, Iruka jumped in front of Naruto, taking the hit. Blood trickled down his side as he gasped in pain, collapsing onto the dirt.

"Iruka-sensei!" Naruto cried out, horror filling his voice.

But as the moment stretched, Xuan Tian's dark influence began to completely consume him.

In that instant, Naruto's soul turned into something much darker and darker. He heard the ancient voice of Xuan Tian echo in his mind, cold and calculating. "The time has come, boy. "

A wicked grin spread across Naruto's face, his eyes are glowing with the crimson hue of demonic cultivation energy. With a dark chant whispered into the air, Xuan Tian pulled chakra from the depths of Naruto's core where the nine tails is present. The mix of red ad black demonic aura swirled around Naruto's form.

Iruka looks tattered, collapsing under a tree watches this in shock, too weak to intervene. This… this chakra isn't Naruto's! that's what he thought. he thought in horror. As the boy stood over, a strange aura radiating from his body. Sensing the dangerous demonic energy, Iruka immediately remembered the Kyuubi incident, every one in Konoha knows about the Kyuubi incident, its rampage and the damage done.

Naruto watches Iruka Sensei state. Desperate and driven by a surge of adrenaline, Naruto unleashed the forbidden technique: Multi Shadow Clone Jutsu (the same justsu that he stolen). Scores of shadow clones materialized, overwhelming Mizuki. (even though Mizuki is stronger, he can't win when faced against multiple opponents attacked at the same time) 

"How is this possible? How can I be defeated by a mere academy student?

Impossible!" "Ahhhhhhhhhhhhhhhh"

These are the last words of Mizuki and then he collapses.

Along with him Naruto also collapses due to the massive drain on Naruto's chakra caused him to collapse, his body teetering on the brink of exhaustion.

The darkness ebbed from his body as the demonic energy took its toll.

Iruka who is badly wounded, deeply concerned about Naruto, carried the unconscious boy to the village hospital. Medical ninja worked tirelessly to stabilize Naruto, but as the hours passed. Naruto's condition deteriorated. Pale and barely clinging to life, Naruto lay in a deathlike state. The young medics whispered that he had simply overexerted himself, but none suspected the true reason for his decline.

In the hospital, as Naruto lay unconscious, Xuan Tian made his final move.

Within the Naruto boy's soul, the last fragments of Naruto struggled, desperately clinging to existence. "What is this place?" Naruto's small, ethereal form wandered through the dark expanse of his mindscape, feeling the overwhelming presence of Xuan Tian looming over him.

"You're no longer needed," Xuan Tian's voice echoed ominously, his form manifesting in front of Naruto like a towering, ancient demon. "This body belongs to me now."

"No!" Naruto screamed, fear and defiance flooding his heart. "This is my body, my life! You can't take it from me!"

But Xuan Tian only chuckled darkly, his eyes flashing with malevolent intent. "Your soul is weak, boy. You have no idea what true power is. Let me show you."

With a cold, ruthless gesture, Xuan Tian reached out and seized the last remnants of Naruto's soul. Naruto struggled, his small form fighting back with everything he had, but it was useless. The demon cultivator's power was insurmountable.

The last thing Naruto saw before his consciousness faded was Xuan Tian's malicious grin. Then, darkness consumed him entirely. 

Xuan Tian stood alone within the mindscape now, a smirk tugging at his lips. "And so, it begins. Naruto Uzumaki is no more. This body, this world… it all belongs to me."

As Naruto's body lay still in the hospital bed, his face was calm. His eyes opened slowly, but the boy who had once inhabited the body was gone. Only Xuan Tian remained. A wicked grin spread across Naruto's face.

The real story will begin from here.

Xuan Tian, now fully in control of Naruto's body, would rise in the world of shinobi, using his demonic cultivation techniques and jutsu's to assert his dominance, all while manipulating the relationships around him to build his harem of kunoichi.

The Hidden Leaf Village had no idea what was coming. The demonic cultivator, with the face of a boy who looks kind and naive that they once knew, would soon change the entire course of history and their lives.