Transmigrated in Uchiha Clan with Sign-in System Start with Rennigan

Ōnoki, with a mighty swing of his enormous fist, descended from the sky towards Sarutobi Hiruzen, delivering a thunderous blow.

A fierce battle ensued.

Boom boom boom!

However, at that moment, explosions and commotion erupted from several other locations in the village. Sarutobi Hiruzen's expression turned grave, his brows furrowed.

It seemed the enemy wasn't just one person; Iwagakure, taking advantage of Konoha's weakened defenses, had launched a full-scale invasion. Hiruzen realized the attack in the Land of Grass was a feint.

"Leave this to me; go support other areas!" Hiruzen commanded the surrounding Anbu members in a low voice. "And find Danzo and Orochimaru immediately!"

"Yes!"

Whoosh whoosh whoosh!

The Anbu, highly disciplined, immediately dispersed, vanishing in a flurry of Body Flicker Techniques.

Only Hiruzen and Ōnoki remained.

Ōnoki's eyes gleamed; this was his chance. If he captured or killed Hiruzen before Konoha's reinforcements arrived, the mission would be a success. But was it that easy?

Hiruzen, though old, was once Konoha's strongest Hokage, possessing all five chakra natures and a vast repertoire of jutsu, earning him the title of "Jutsu Professor." Despite his earlier dismissive attitude in the Tsuchikage's office, Ōnoki didn't underestimate Hiruzen.

The battle between Konoha and Iwagakure, beginning with the clash between Ōnoki and Hiruzen, had fully commenced. Konoha had been tricked; its main forces were at the front lines, leaving its defenses vulnerable, allowing Iwagakure to exploit the weakness.

Smoke quickly enveloped the entire village.

The situation was dire.

The Anbu and Konoha Guard were locked in fierce battles. Even Danzo was forced to deploy the elite members of Root.

Initially, he planned to inflict losses on the village, staining Hiruzen and Minato with irremovable blemishes, facilitating his own rise to Hokage. But Danzo couldn't hold back any longer; if he didn't act, Konoha might truly fall, rendering his Hokage ambitions meaningless.

"Damn it, this is terrible!"

Looking at the smoke-filled Konoha, Uchiha Kouki felt despair. He thought staying behind would be a cushy assignment, but the enemy had attacked directly.

Fortunately, Uchiha Kouki now possessed the Flying Thunder God Technique, allowing him to face the invading jonin and chunin calmly and skillfully.

He should have been assisting the Konoha Military Police in evacuating civilians, but Uchiha Kouki didn't.

This was a rare opportunity to hone his combat abilities! Real combat was the most effective training; Uchiha Kouki didn't want to be a theorist.

This wasn't a large-scale battle; it was scattered fighting throughout Konoha, perfect for practice.

With the Flying Thunder God Technique as a safety net, his only weakness was rapid chakra depletion, easily solved with Military Ration Pill.

Slap!

In a deserted corner, Uchiha Kouki, using Transformation Jutsu to disguise himself as an Anbu, placed a Flying Thunder God seal.

"Alright, enough marks. Plus, three Flying Thunder God kunai should be sufficient," Uchiha Kouki mused, consuming a Military ration pill to quickly replenish his depleted chakra.

"Now, it's my time to shine!"

Uchiha Kouki stretched, feeling a surge of excitement. For someone who lived in a modern city in his past life, real combat was a completely new experience. The fight with Ōnoki, though terrifying, had also been exhilarating.

Whoosh!

Using the Body Flicker Technique, Uchiha Kouki vanished in a flash of light.

.....

In front of the Ninja Academy.

Clang clang clang! Hiss hiss hiss!

The sounds of clashing blades and flesh being cut rang out repeatedly as several figures moved in a chaotic dance of combat. After a fierce struggle, the Anbu had been eliminated by the Iwagakure ninjas.

The Iwagakure ninjas were cunning, using the Earth Hiding Technique to move underground, silently surrounding and eliminating Konoha ninjas. They would then disappear again using the same technique. It was a ruthless but effective tactic.

Konoha's defenses were weak, its ninjas fighting in small, scattered groups. The chaos prevented effective communication and coordination. Many Konoha ninjas had already fallen victim to this tactic.

"Done. Tetsuyama, sense any nearby Konoha ninjas!"

Fumihaga, leading the squad, instructed the sensor ninja.

Tetsuyama closed his eyes and sensed. "Eight hundred meters to the southeast, four Anbu ninjas. We can use our standard tactic to eliminate them... Wait, a ninja is approaching. Based on the chakra level, it's a genin."

"A genin..."

Fumihaga and his team exchanged surprised glances. The four of them were highly coordinated jonin, strong and battle-hardened; ordinary jonin wouldn't stand a chance.

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