Naruto: Uchiha Izuna with system

Suddenly, Senju Tobirama's eyes flashed, and he noticed a new shuriken materializing from the iron filings of the shurikens that should have disintegrated in the aftermath of his water jutsu.

The shuriken spun in the air, its central hole entangled with silk threads, rotating in wide circles and heading straight for him.

"A hidden shuriken among the shurikens?!" he realized, recognizing the Uchiha's Shadow Shuriken Technique.

Tobirama vanished mid-air—not through teleportation, but via the Flying Thunder God Technique. The battlefield was dotted with his specially marked kunai, making it impossible for even the Sharingan, with its predictive capabilities, to foresee where Tobirama would appear next.

He had likely developed the Flying Thunder God specifically to counter the Uchiha's predictive prowess.

However, within the kaleidoscope of Izuna's spinning left eye, the scene unfolded like a film.

**Senju Tobirama appeared at the nine o'clock position, gripping a broken tree with a kunai, and prepared to launch a high-speed attack against Izuna with an advanced water jutsu: Water Release: Water Breaking Wave.

As the screen retracted, Izuna turned his gaze towards the nine o'clock direction. There, on a broken tree about two hundred meters away, was indeed a Flying Thunder God Kunai embedded in the bark.

Before Tobirama could unleash his attack, Izuna surged forward.

He quickly condensed airflow in his right hand into two fist-sized blue spheres, each with four sharp edges that whistled through the air.

"Wind Release: Rasengan!"

Though he lacked the awakened Senjutsu chakra to throw it, this was still an advanced A-rank wind jutsu!

As Izuna rushed forward, Senju Tobirama also flashed to the broken tree. He was about to form a hand seal with one hand to activate Water Release: Water Breaking Wave, but Izuna's Rasengan was already barreling towards him, aimed directly at his face.

"What?!" Tobirama exclaimed, surprised. Years of combat experience kicked in, and he tilted his head just enough to dodge, but the side of his face and shoulders still bore the brunt of the Wind Release: Rasengan.

Wow!

Blood sprayed from his cheeks and shoulders, but Izuna's Rasengan had lost much of its force by the time it made contact.

In response to the injury, Senju Tobirama activated the Flying Thunder God Technique again, vanishing from the spot and reappearing five hundred meters behind and to the right of Izuna.

There, another Flying Thunder God Kunai had also landed.

Boom!

Izuna's Rasengan collided with the ground, causing a massive explosion. Moments later, he emerged from the smoke, frowning. "Flying Thunder God... It's truly a troublesome ninjutsu."

Tobirama's mood was even more complicated. Why?

The Sharingan's predictive ability should be unable to counter the Flying Thunder God!

Is this a new ability of his Sharingan?

Feeling a stinging sensation in his left eye, Izuna instinctively covered it.

Damn it!

Had his eyes started to protest after just a short use?

It's useless!

Izuna's left eye granted him the ability to foresee the future—similar to Katakuri's advanced Haki in One Piece, which allowed brief glimpses into what was to come. This ability was a natural counter to instant ninjutsu like the Flying Thunder God.

Yet he had never anticipated that his eyes would ache after such a short time using them.

"I don't want to engage in a drawn-out battle with you feeling like this."

Izuna clapped his hands together and then positioned them towards Senju Tobirama. "Let's settle this quickly."

"Lightning Release: Earth Walk!"

Lightning crackled from Izuna's fists, and in the next instant, thunder rumbled as it struck the ground.

Senju Tobirama stood frozen in shock.

The Uchiha clan was renowned for their proficiency in fire techniques, yet Izuna seemed more adept in wind and now lightning. Wasn't it Madara Uchiha who specialized in lightning techniques?

"But this level of Lightning Release is hardly worth mentioning."

With both hands, Tobirama brandished six Flying Thunder God Kunai, launching them into the air in a 360-degree spread.

Tobirama vanished once more, easily evading Izuna's lightning attack.

Bang! Bang! Bang! Bang! Bang! Bang!

Reappearing mid-air, six clones of Senju Tobirama emerged, each grasping a Flying Thunder God Kunai.

"Did he use the Shadow Clone Technique when he disappeared?"

"Water Release: Water Breaking Blade!"

The sharp water technique wrapped around the kunai in Tobirama's hands, and the six figures transformed into a "blue flash." Even with the kaleidoscope vision, Izuna found that his body couldn't keep up with the speed.

In the blink of an eye, six Senju Tobirama figures surrounded Izuna, each poised to strike at his throat, heart, waist, calves, and other vital areas.

Boom!

The sound of steel clashing echoed as the six Tobirama figures froze in shock.

Upon closer inspection, Izuna had broken the tip of one specially crafted Flying Thunder God Kunai.

"This is completely different from what Uchiha Sasuke faced, forcing me to use this move."

Izuna's disgruntled voice echoed around him. Tobirama frowned, observing that Izuna's body was enveloped in a white rib cage.

In an instant, a massive skeletal arm emerged from the rib structure, engulfed in blazing black flames.

"Susanoo: Amaterasu!"

The skeletal arm swung toward Senju Tobirama in an explosive assault.

With his left eye predicting the future and his right eye wielding Amaterasu, if both eyes were opened simultaneously, he could unleash the secret of the Mangekyō Sharingan: Susanoo.

This was Izuna's Mangekyō Sharingan!

(End of the chapter.)