Kaleidoscope of Zero

"How could it be him?"

Uchiha Rei stood in the shadows, his gaze like a knife, fixed on the figure gradually entering Orochimaru's laboratory. In Konohagakure, there were three people connected to Orochimaru: Anko Mitarashi, Danzo, and Kabuto Yakushi. However, the one entering Orochimaru's training room was not one of them, but someone from the Uchiha Clan.

Uchiha Rekka, an elite Jonin of the Uchiha Clan, was hailed as the strongest person besides Itachi. His arrival could not be a mere coincidence.

"The covert war between the Hokage higher-ups and the Uchiha is just a pretense. The real opponents are actually the Hokage higher-ups and Akatsuki."

The two strongest pillars of the Uchiha Clan were subordinates of the Third Hokage and Danzo. How could the Uchiha fight against the Hokage higher-ups?

Uchiha Rei mused in his heart. He knew that he had reported information about Uchiha Itachi yesterday. This Rekka was, most likely, sent by the clan to silence him.

"Since that's the case, I'll strike first."

His left eye twitched slightly, and an unsettling vortex surged in his black pupil. It was the Mangekyo Sharingan he had just obtained through the Sign-in System.

"Where is that Uchiha Rei?" Rekka asked coldly, anger in his voice. "How dare he betray Lord Itachi? I'll let him know the power of the Three-Tomoe Sharingan."

Before his voice faded, the sound of air being torn apart echoed from the darkness.

"Chik-- Chik-- Chik--"

Three kunai flew out from different angles, precise and ruthless, sealing off all of Rekka's escape routes. Rekka's pupils constricted, and his body flickered. Although he avoided the fatal blow, the armor on his shoulder was cut.

"An enemy!"

Rekka reacted extremely quickly and gritted his teeth as he formed hand seals.

"Fire Style: Great Fireball Jutsu!"

Boom--!

Flames roared like a dragon, carrying a scorching wave of heat, charging into the darkness. But amidst the firelight, a figure lightly raised a hand, the hand seals almost too fast to follow--

"Fire Style: Great Fireball Jutsu!"

Another even more intense fireball surged out, not only engulfing Rekka's attack but also continuing to advance with residual power. The ground was scorched, and in the firelight, Rekka's expression finally changed.

"His ninjutsu is stronger than mine..."

With no time to think, he suddenly drew his sword and charged, his long blade gleaming like cold water, aiming straight for the enemy's throat.

However, the other person merely deflected the attack with a light parry of his kunai, then unleashed a leg sweep with terrifying force.

"Thump--!"

Rekka flew out like a kite with a broken string, crashing heavily against the wall, spitting blood from his mouth. Even the armor on his chest cracked.

"His taijutsu is also no match..." he was utterly horrified.

I can no longer hold back.

He took a deep breath, and the three tomoe in his Sharingan began to spin rapidly, faintly revealing a power that did not belong to reality.

"Hell Viewing Technique."

In an instant, the lights in the training room began to twist strangely, the walls seemed to be spinning, space distorted, stretched, and overlapped. A cold smile appeared on Rekka's lips: "Once you fall into my genjutsu, no matter how strong you are, you will be powerless to break free."

His eyes were filled with confidence. According to clan intelligence, Uchiha Rei's pupil power was extremely weak and could not resist the advanced genjutsu of the three tomoe.

However, in the next second, his vision suddenly blurred.

When he opened his eyes again, he found himself standing on the Uchiha Clan's training grounds.

Familiar wooden stakes and targets surrounded him, and in the distance were the clan's main residence and the bluestone paths. Everything was just like an ordinary afternoon practice.

"This is... genjutsu? No... this isn't my genjutsu!"

He was horrified, and suddenly turned around. In the center of the training ground, flames spread silently, like countless snake tongues, quietly approaching.

"Hiss--!"

Rekka's pupils contracted violently. The flames were not ordinary fire, but like living creatures, instantly clinging to his body.

"Ahhhhhh!!"

Agony! From skin to bone, the flames devoured his will and nerves. His screams tore through the sky.

"This is impossible... this isn't just an illusion... I... I'm really burning... Sharingan... why can't it resist?!"

In reality, Uchiha Rekka's eyes were hollow, and his standing body began to tremble violently.

And in the darkness, Uchiha Rei slowly retracted his hand seals, a line of blood tears flowing from his left eye. His Mangekyo pupils spun into a double-ringed spiral, as deep as a vortex of death.

"Magatsuhi."

The name of the Mangekyo was uttered from his mouth.

"The most real genjutsu never deceives the eyes... it deceives the soul directly."

It is said that every pair of Mangekyo Sharingan is a obsession from the depths of the soul.

Uchiha Obito, after witnessing Rin Nohara's death, collapsed. He no longer wanted to face the cruel reality and longed to escape, thus awakening Kamui, which could distort space and conceal himself. He hid himself in the void, only to escape pain.

Uchiha Shisui, throughout his life, tried to prevent the Uchiha clan's rebellion through gentle means. His Sharingan was named Kotoamatsukami, a silent change, symbolizing his ideal of no bloodshed.

Uchiha Itachi, on the path of choosing to annihilate his clan, walked a lonely road. He condensed his understanding of pain into "Tsukuyomi," creating an infinite cycle of dreamscapes.

Madara Uchiha, wanting to control fate and reverse everything, his Sharingan abilities all enhanced Susanoo. The powerful Susanoo was his determination to control everything.

Uchiha Rei, poisoned and with only three days left to live, stood at the precipice of life and death. His awakened Mangekyo Sharingan, named Magatsuhi, connected death and reality, hovering between the boundary of life and death.

It possessed two abilities: when used on an enemy, it burned the user's chakra to open the gates of the Yellow Springs, sending the opponent into the Yellow Springs to drown in a near-death Illusionary Realm, experiencing true death in their consciousness, symbolizing death; when used on oneself, burning chakra could accelerate the flow of time, exchanging it for a brief period of invincibility, symbolizing life.

No one's Mangekyo Sharingan was the strongest, but it was definitely the most suitable for its host.

After dealing with Uchiha Rekka, the time had just turned 12 o'clock.

[Ding!]

[Sign-in commencing!]

[Sign-in location: Orochimaru's Lab No. 1!]

[Sign-in reward obtained: Jonin-level Medical Ninjutsu!]

A warm current flowed into Uchiha Rei's mind. He felt as if he had gained new memories, the essentials of various high-level medical ninjutsu imprinted in his mind. He attempted to condense chakra, and green medical chakra emanated from his palm, easily allowing him to perform the Medical Ninjutsu: Scalpel Technique, precise and pure, enough to rival Konoha's elite medical ninja.

This was good news. But it was also not good news.

Jonin-level Medical Ninjutsu had a certain inhibitory effect on the potent poison within his body, but the poison from Hanzō, the pinnacle of the ninja world and a poisonous weapon, was of Kage-level existence and could not be completely expelled by ordinary medical techniques. The most he could do now was to delay the toxins within his body. If he were willing to spend time, he could alleviate the toxins within him. However, on the eve of the Uchiha clan massacre, time was precisely what he lacked.

The good news was that he currently only had one Mangekyo Sharingan. With only one Mangekyo Sharingan, he could not awaken the complete Susanoo. In the future, he would definitely need to transplant a second Mangekyo Sharingan to obtain the legendary ultimate dōjutsu, the complete Susanoo, and this Medical Ninjutsu would be extremely crucial in the future.

Rei organized his thoughts, put on his goggles, and walked out of Orochimaru's laboratory. As soon as he exited, he keenly sensed a trace of unfamiliar chakra fluctuation; someone was monitoring him using the Telescopic Technique.