Naruto: Sasuke's Resurgence

After spending the day cleaning up his family compound, Sasuke made a brief trip to the market using some of the pocket money he had collected. He returned with a handful of groceries, a simple act which marked a subtle step toward rebuilding his life in this new world. Whilst the Sasuke in his memory couldn't cook, with his memories of Ren he was more than capable of preparing some food. In the quiet of his kitchen, he deftly prepared a comforting bowl of miso soup, a taste of familiarity that warmed his body and soul in this cold, desolate home .

With dinner now consumed, Sasuke found himself physically and mentally drained. Collapsing onto his futon, he felt the weight of his exhaustion settling in. Yet, before succumbing to sleep, a familiar habit from his previous life nudged at him – the need to plan for the day ahead, a practice ingrained by the demands of his hectic university schedule.

As he lay there, thoughts drifted through his mind like shadows.

"What should I do tomorrow? There's no need to attend ninja school for the rest of this month, for rather obvious reasons. Perhaps I should test my ability to reproduce the Ninjutsu and Taijutsu the former Sasuke learned to determine if I need to start from scratch. And then, a discussion with the Hokage is in due order, exploring the possibility of accessing the Uchiha clan's family financial resources—assuming it hasn't all been robbed already."

As Sasuke mulled over these considerations he began to slowly close his eyes, allowing the quietude of the night to envelop him, the promise of a new day awaiting with its challenges and possibilities.

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As time unfurled its passing, morning arrived with sunlight gently lighting up the desolate Uchiha compound.

Groggily rising from his futon, Sasuke refreshed himself. Passing by a mirror, he confronted the reflection of a young boy, not even ten years of age. The child's countenance bore the hallmark Uchiha traits – cold, obsidian eyes, unruly black hair that gravity-defying, and with that a face that belied a maturity far beyond his years. Delicate features and fair skin created a visage that might have been mistaken for a girl if not for the pronounced boyishness present in the child.

In a moment of narcissism, Sasuke marvelled at his countenance. However, his musings veered toward the curious circumstances of his newfound physical prowess. The swift cleanup of the entire Uchiha family compound in a single day seemed incongruent with Sasuke from his memories, a revelation that puzzled him. 

As he slowly focused his attention on his chakra, he sensed a reservoir far surpassing what he had known before inheriting this body.

The chakra, though not on par with the levels of his father or brother, surpassed his previous understanding – now a formidable 30% of their capacity, a remarkable leap from the original <5%. This placed him well within the range of a seasoned Jonin, a rank coveted for its exceptional skill and experience in the shinobi world that is only held by a Ninja Village's most elite shinobi.

'It couldn't be...' Shock tinged Sasuke's thoughts as he glanced at the mirror and he soon began to focus chakra into his eyes. Suddenly, time seemed to warp, and the world around him unfolded with unprecedented clarity.

Reflected in the mirror were eyes that glowed with an eerie crimson intensity, adorned with three ominous black tomoe encircling the pupil in a distinct ring. The Sharingan stared back at him, its presence eerie and unsettling.

'A 3-tomoe Sharingan?' Sasuke's mind raced as he contemplated the anomaly. According to his recollections, Sasuke had only awakened the 3-tomoe Sharingan during his fight with Naruto at the Valley Of The End. The revelation only puzzling him further.

The Sharingan, the Uchiha clan's Kekkei Genkai, possessed numerous abilities, ranging from copying techniques to heightened visual acuity. It manifested in three forms – 1-tomoe, 2-tomoe, and 3-tomoe – each signifying a deeper level of evolution and augmented basic abilities.

'Even if I unlocked a 3-tomoe Sharingan, it doesn't explain this absurd surge in chakra.' Sasuke contemplated the incongruity, for chakra typically increased with age, making his newfound strength inexplicable.

With an unsettling thought appearing in his mind, Sasuke poured chakra into his eyes once more, witnessing the evolution of his 3-tomoe Sharingan into a new pattern. It sported a vivid black iris in stark contrast to the intricate scarlet pattern within, glowing with a piercing luminescence. The revelation left him dumbfounded, grappling with the extraordinary mystery unfolding within him.