For the vast majority of Uchiha, the Great Fireball Jutsu was actually sufficient.

Sage Art: Great Fireball Jutsu.

Kazuki also quickly formed hand seals, and a massive fireball was spewed out by him.

Although it was only the Great Fireball Jutsu, in Kazuki's hands now, combined with Senjutsu Chakra, even the Great Fireball Jutsu displayed power not inferior to Fire Release: Great Fire Annihilation.

The two flames collided, and for a moment, neither could overcome the other.

As expected of Fire Release: Great Fire Annihilation!

Kazuki's lips curved into a smile. This ninjutsu has excellent power, it will be his from now on.

Little did he know, Izuna's heart was also in turmoil.

A mere Great Fireball Jutsu could actually rival his Fire Release: Great Fire Annihilation.

How did the opponent do it?

However, Izuna was, after all, known as a ninja with no weaknesses. While shocked by the terrifying power of Kazuki's Great Fireball Jutsu, he had already charged at Kazuki with his longsword, thrusting it towards Kazuki.

Kazuki immediately drew the Sword of the Thunder God, and it collided with the longsword in Izuna's hand.

"That despicable, shameless, vile bastard Tobirama's sword? Why is it in your hand?"

Izuna bristled upon seeing the Sword of the Thunder God.

The person he hated most in his life was Tobirama. From the moment he saw Tobirama, Izuna felt that the other party would be his natural enemy. It was as if from the moment they were born, they were destined to be mortal enemies, and even their strength had always been neck and neck.

In fact, according to Ninja World history, the strength of the clan heads of the Uchiha clan and Senju clan throughout history had always been similar, with neither being able to completely overcome the other.

If not for the existence of Hashirama and Madara, who were beyond the norm, Tobirama and Izuna were the ones who should have become the leaders of their respective clans.

To be precise, putting aside those two anomalies, Izuna and Tobirama were the normal state.

"Someone gave it to me."

Kazuki chuckled lightly, constantly learning Izuna's Kenjutsu during the battle.

Although it was also Uchiha swordsmanship, Izuna's swordsmanship broadened Kazuki's horizons.

In terms of Kenjutsu alone, Izuna's was the most outstanding he had ever seen.

The Uchiha clan's swordsmanship was used by Izuna with such mastery that it could even be said to have surpassed the inherent level of Uchiha swordsmanship.

If one were to evaluate it, Izuna would probably be the Uchiha Sword Saint.

Hmm, Tobirama was also very skilled in swordsmanship.

These two were truly rivals in brilliance.

Kazuki was not in a hurry. Instead, he continuously studied Izuna's fighting style through his Sharingan, incorporating the opponent's Kenjutsu and combat methods into his own tactics.

When it came down to it, Izuna was the most standard Uchiha, fighting elegantly and cleanly.

This was the Uchiha fighting style in Kazuki's mind, and also the fighting style currently lost by the Uchiha.

Ever since Madara left the Uchiha, the Uchiha clan no longer had such self-reliant ninjas.

As for Kagami, his strength was not bad, but ultimately, he was a ninja trained after Konoha's establishment. His usual combat focused more on teamwork, unlike the ninjas of the Sengoku era, who pursued individual strength.

In terms of individual strength, the strength of the ninjas in the Ninja Village era generally could not keep up with the Sengoku era, but in terms of overall strength and team combat, the ninjas of the Ninja Village era were more excellent.

Izuna was the epitome of the Uchiha's limit. From him, Kazuki learned a lot. He felt that no matter what dropped from Izuna later, this battle with him was the most meaningful.

"Is that so?"

Izuna nodded thoughtfully, but the thought of an Uchiha descendant wielding Tobirama's weapon made him feel uncomfortable.

"Brat, your talent is very good. Have you ever seen the true power of the Uchiha clan?"

After speaking, the three-tomoe Sharingan in Izuna's eyes rotated rapidly, quickly merging into one, transforming into the appearance of a Mangekyo Sharingan.

A black skeletal figure appeared around him, and a ball of black flame shot out from the skeleton's hand towards Kazuki.

Amaterasu?

It seems there's also Kagutsuchi.

Kazuki's eyes erupted with surging ocular power, and Susanoo also appeared around him, protecting him.

In just an instant, the fourth form of Susanoo appeared around him. The black flames landed on the Susanoo, clinging to it like a persistent disease.

Kazuki felt the Susanoo's condition and instantly understood the effect of Amaterasu. This was indeed a very troublesome dojutsu. Theoretically, it would burn everything it saw. The Amaterasu flames burned on the Susanoo, looking as if they were about to completely incinerate the Susanoo.

Fortunately, Amaterasu was not without a solution.

Kazuki's ocular power erupted, and the area where Amaterasu was burning, along with the flames, instantly peeled off, and then quickly regenerated.

"Susanoo?"

Even Izuna could not remain calm at this moment. He was very certain that Kazuki's eyes were only three-tomoe Sharingan, but how could a three-tomoe Sharingan use Susanoo?

He could feel Kazuki's ocular power, which was even above his own and his older brother Madara's.

Izuna felt a bit lost.

"Then let me show you the true Susanoo!"

Kazuki gazed at Izuna. The Susanoo, which was already in its fourth form, grew further, transforming into a hundred-meter-tall Susanoo giant in an instant.

Looking at the Susanoo holding a sword in one hand, clad in armor, and with wings on its back, Izuna became even more bewildered.

Why did he feel that their Sharingan were almost a world apart?

However, his battle instincts prevented him from showing any fear or panic, even when facing a Susanoo far more powerful than his own.

He gritted his teeth and activated his Susanoo, bringing his Susanoo to its third form. For this, his eyes were filled with blood and tears.

However, when facing Kazuki's Perfect Susanoo, Izuna's Susanoo instantly fell into a disadvantage.

Thud!

With one sword strike, Izuna's Susanoo was half-destroyed, and then the second and third strikes fell continuously.

In an instant, Izuna's Susanoo dissipated.

"Farewell! You are a respectable strong individual."

Kazuki's Susanoo's greatsword was raised high. Countless lightning bolts swirled around the blade, and then it slashed down towards Izuna.