Sharingan Evolution, Mangekyo

Uchiha Shaoyu felt the lingering, delicate sensation of skin contact still ghosting over his fingertips. Every inch of this body, which now belonged to "Uchiha Shaoyu," surged with unfamiliar yet scorching chakra.

Chakra was truly a miraculous energy. This was the first time Uchiha Shaoyu had ever felt it, something he could never have experienced in his previous life.

He tried to mobilize this power, letting the chakra flow slowly through his meridians as he felt the rhythm of life, a rhythm entirely different from that of his past life. Just then, a sudden wave of dizziness slammed into his brain, as if someone were striking his skull with a heavy hammer.

The scene before him twisted and blurred instantly; the once-clear courtyard of the Uchiha compound began to ripple with layers of overlapping shadows.

"Urgh..."

He let out a muffled groan, subconsciously reaching up to press his temples. The dizziness, however, did not ease; instead, it surged more violently, as if another consciousness were frantically pouring into his mind along the pathways of his nerves.

It was not an aggressive plunder, but rather a "remnant" carrying an extreme obsession. This was the consciousness of the original owner.

Uchiha Shaoyu realized in an instant that his transmigration into this body was not a simple case of empty occupation. Although the original owner had died, that lingering obsession had transformed into fragments of consciousness, firmly rooted in the mental space of this body.

The next second, countless images exploded in his mind like a bursting dam.

It was the original owner's short but blood-stained life.

In his childhood, under the cherry blossom trees in the compound, he held the hand of a boy half a head shorter than himself. The boy had the same black hair and black eyes, clutching his sleeve timidly and calling him "big brother."

As he grew older, he learned ninjutsu from the clan elders, never uttering a sound even when shuriken sliced his fingers, all so he could grow stronger sooner to protect the younger brother by his side.

Later, the atmosphere within the clan grew increasingly oppressive. The familiar faces of his clansmen became guarded and distant. Rumors coiled around the entire Uchiha clan like poisonous vines; some said they were plotting a rebellion, others said the Hokage had long harbored suspicion toward them.

The scenes suddenly turned bloody.

Flames soared into the sky. Houses in the Uchiha compound collapsed in the inferno, and the pungent smell of smoke mixed with the stench of blood rushed toward him. The original owner held a kunai, his back against a wall, his body already covered in wounds, blood soaking his clothing and the Uchiha crest.

The original owner had been severely wounded in an attack by a jinchuriki and ultimately died in his own home.

"Revenge..."

A weak yet incredibly clear voice echoed in Uchiha Shaoyu's mind, laced with hatred interwoven with blood and tears.

"Avenge me... and... my little brother... protect him well..."

The voice sounded like a prayer uttered with the very last of the original owner's soul, each word striking heavily against Uchiha Shaoyu's heart.

He could clearly feel the unwillingness, the anger, and the despair in the original owner's consciousness, and even more so, the heavy sense of responsibility toward his younger brother.

He was not the original owner, yet at this moment, as these memories and emotions flooded his consciousness so realistically, he felt a powerful resonance.

He had transmigrated into this world and occupied this body; therefore, the original owner's obsession was perhaps a responsibility he had to shoulder.

Uchiha Shaoyu took a deep breath. Although his brain was still dizzy, his gaze gradually grew firm.

In his heart, he nodded slowly toward that lingering consciousness.

"Fine, I promise you. I will take your revenge. I will kill Danzo. And your brother—I will do everything in my power to protect him."

The moment those words fell, the dizziness in his mind suddenly weakened, and the surging images began to fade, disappearing bit by bit like a receding tide.

The voice carrying the obsession seemed to have finally found solace, eventually turning into a touch of warmth that brushed gently over Uchiha Shaoyu's consciousness before dissipating without a trace.

The surrounding scenery became clear once again. The cherry blossom tree in the courtyard stood tall, and as a breeze blew, pink petals drifted slowly down, landing on Uchiha Shaoyu's shoulder.

He raised his hand and touched his chest, where his heart was beating steadily and forcefully.

This was the original owner's heart, yet it now carried his own will.

He raised his hand, flexing his fingers, and could clearly feel every muscle contracting and relaxing. The chakra within him was no longer chaotic as it had been before; it flowed steadily through his meridians, like a tamed stream—docile, yet harboring hidden power.

At this moment, he was absolutely certain that he had gained full control over this body named "Uchiha Shaoyu."

Just as he was savoring the sense of stability brought by this control, a warm and vast spiritual energy surged from the depths of his body without warning, like a dormant volcano suddenly erupting, rushing straight toward his soul.

This spiritual energy carried the last trace of the original owner's aura, yet there was no sense of rejection. Instead, like a dear friend reunited after a long time, it gently wrapped around his soul and slowly merged into it.

"Hm?"

Uchiha Shaoyu raised an eyebrow, not resisting this sudden influx of spiritual energy.

He could clearly feel that as this power merged, his soul felt as if it had been injected with a stimulant; his already-formidable spiritual energy began to skyrocket at a speed visible to the naked eye.

The mental space in his mind was like an ocean being widened; where it could once only hold a small stream, it could now carry the surging of great rivers.

"Is this... the original owner's spiritual energy, or something that came with my transmigration..."

This surge of spiritual energy brought a powerful impact, and countless images flashed before his eyes.

There was the original owner playing with his younger brother, Uchiha Shisui, under the cherry blossom trees as a child; the sweat shed during his grueling ninjutsu training; and the anxiety he felt when facing the clan's crisis.

These images were no longer surging and chaotic as before; instead, they played out slowly like a film, every detail incredibly clear, as if they were memories he had experienced himself.

"Did the original owner... turn his own soul into pure spiritual power for me..."

"He really was a good brother."

Uchiha Shaoyu couldn't help but sigh with emotion.

As the memories merged, the spiritual energy integrated into his soul grew ever more immense. A scorching pain suddenly flared in Uchiha Shaoyu's eyes, as if flames were burning beneath his eyelids.

He subconsciously reached up to cover his eyes, yet he could feel some kind of power rapidly awakening and evolving beneath his lids.

"Sharingan..."

He murmured under his breath, already having a premonition.

Previously, in the original owner's memories, he knew this body had already awakened the Three-Tomoe Sharingan, but due to the original owner's death and his own transmigration, the Sharingan had remained in a dormant state.

But now, with the surge of spiritual energy and the complete fusion of memories, this bloodline limit belonging to the Uchiha clan was finally about to undergo a new evolution.

This feeling was truly excellent.

He slowly lowered his hand and opened his eyes. The scene before him was already different.

The surrounding world seemed to have slowed down; the trajectory of every cherry blossom petal falling in the courtyard was clearly visible.

He could precisely capture the weight and urgency of every footstep coming from afar.

Within his eyes, the original Three-Tomoe Sharingan was spinning rapidly. The shape of the tomoe began to twist and deform, as if being reshaped by an invisible force.

The three tomoe gradually merged, their edges becoming sharp, and the patterns growing increasingly complex.

The once pure black tomoe were now emitting a faint, scarlet light, forming a stark contrast with the white of his eyes, appearing eerie and mysterious.

Uchiha Shaoyu could feel the power contained within his eyes growing exponentially. It was not just an improvement in insight and copying abilities, but the gestation of a brand-new, powerful force.

He walked to the well in the courtyard and looked down at the water.

The water reflected his face, and those eyes had completely changed.

The original three tomoe had disappeared, replaced by a pair of uniquely shaped Mangekyo Sharingan.

At the center of the pupils was a rotating black pattern, like a blooming black mandala, surrounded by sharp red lines on the edges. Each line looked like an unsheathed blade, radiating a chilling aura.

"Is this... the Mangekyo Sharingan?"

"This... it's already here?"

Uchiha Shaoyu muttered to himself, his heart filled with shock.

He knew that in the history of the Uchiha clan, only those who had experienced immense grief or obsession could awaken these eyes that represented both power and a curse.

The original owner's death, the obsession for his brother, and the soul fusion brought by his own transmigration—all these factors combined had actually allowed him to bypass the ordinary Sharingan stage and awaken the Mangekyo Sharingan.

He tried to mobilize the power in his eyes. In an instant, a powerful spiritual force was released from them, and the surrounding space seemed to ripple.

He could clearly feel that he could use powerful ocular techniques through these eyes, though the specific abilities would require slow exploration.

He slowly closed his eyes, feeling the surging power within his body.

The surge in spiritual energy and the awakening of the Mangekyo Sharingan had caused his strength to take a qualitative leap.

The injuries on his body had also recovered; he didn't know the principle behind it.

He now possessed the capital to stand firm in this world fraught with crises, and the confidence to fulfill his promise.

With the Mangekyo Sharingan, he was undoubtedly a Kage-level powerhouse, and he now had the ability to protect himself.

"Original owner, do you see this?"

Uchiha Shaoyu whispered in his heart.

"I have not only taken control of your body, but I have also awakened the Mangekyo Sharingan."

"I will definitely avenge you, and I will use these eyes and this powerful strength to protect your brother and your clansmen well."