Chapter 5: Uchiha Nan's Home
On the way back, Nan deliberately avoided other people and safely made it home.
He didn't dare let anyone see him in this blood-soaked state—it would be hard to explain.
More importantly, he hadn't finished sorting through Uchiha Nan's memories. If he ran into someone who knew Nan and slipped up, he could easily raise suspicion.
And during wartime, even a hint of being a spy could lead to serious trouble. If they started digging, his secret might be exposed.
Back at home, Nan was completely exhausted. All he wanted was some rest.
He had only arrived in the shinobi world less than half a day ago and had already been through a life-or-death battle. For someone who had lived in a peaceful world in his previous life, the experience had been a massive shock to his system.
On top of that, using the Phantom Illusion Technique earlier had drained his energy. He really needed to recover.
Dragging his weary body, Nan collapsed onto the bed and quickly drifted off to sleep.
Before he knew it, the sun had set, and the moon now hung high in the sky. By the time he woke up, it was already nighttime.
Refreshed, Nan stretched, yawned, and sat up. He turned on the light and finally took a proper look at his surroundings.
He had been so tired earlier that he hadn't even taken the time to examine his new home.
This was Uchiha Nan's original bedroom. It wasn't large, and there wasn't much inside—just a bed, a closet, and a small nightstand.
From the neatly folded clothes and bedding, it was clear that the room's former owner was someone meticulous and orderly.
On the nightstand were two picture frames, each holding a photo.
The first was a family portrait taken when Nan's father was still alive. He held infant Nan in his arms, and everyone in the photo wore joyful, radiant smiles.
The second photo was likely taken before Nan's mother left for the frontlines. Nan's father was no longer in it. Though Nan still smiled brightly, his mother's expression had grown more subdued. Han was also in the photo, but without his usual smile.
Nan stepped out of the room and wandered through the rest of the house.
The Uchiha family lived in a modest two-story Japanese-style home. Everything was just as Nan remembered it—only now, the house that once held a family was occupied by him alone, carrying Uchiha Nan's identity.
Having explored his new home, Nan finally had time to sit down and fully review the memories that had merged with his own—to understand who he had become.
And as he dove deeper into those memories, he was shocked by what he found, gaining a far more profound understanding of his new identity.
His memories were split into three parts. The most important was his past life—twenty-eight years of clear, detailed recollections. In his previous world, he had been a highly intelligent doctor with high-functioning autism.
But what truly surprised him was Uchiha Nan's memories.
Nan had originally believed that his soul had crossed over at the moment when Uchiha Nan was fatally wounded by Han. But after sorting through the memories, he realized that wasn't the case.
Uchiha Nan had been born in the 40th year of the Hidden Leaf calendar, shortly before the outbreak of the Third Great Ninja War.
His mother had been a skilled medical-nin who once trained in medical ninjutsu alongside Tsunade, one of the Legendary Sannin.
Apparently, Nan had inherited her exceptional genes, possessing a natural affinity for medical ninjutsu. His diagnostic skills were especially uncanny—almost like he had been born with an innate ability to understand illness and injury.
As the war escalated, waves of wounded shinobi were brought back to Konoha from the front lines.
Due to a shortage of medical personnel, Nan's mother, who had been staying home to care for her young son, had no choice but to bring him along to the hospital while she worked.
Nan grew up in that hospital. Everyone there adored him. When he was just three years old, the hospital took in a severely injured patient.
The case was complex—vital signs were steadily dropping, and no one could pinpoint the cause, much less a treatment.
While the adults were at a loss, little Nan stepped forward and offered his own diagnosis.
At first, the staff thought he was just a child playing around. But after hearing his explanation, they were stunned to realize he was right. Enlightened by Nan's insight, the doctors quickly devised a successful treatment plan.
Everyone believed that Nan had simply absorbed medical knowledge through constant exposure. They were amazed by his intelligence, but didn't think too much of it.
Recognizing her son's potential in medical ninjutsu, Nan's mother began formally teaching him.
Nan's talent proved to be extraordinary. Whether it was theoretical knowledge or chakra control, he mastered everything quickly. Before long, he had a solid grasp of the basics.
He continued learning from his mother while gaining hands-on experience in the hospital. Two years passed this way, and by the age of five, Nan was ready to enter the Ninja Academy.
By then, he had already reached the level of a competent medical-nin.
After Nan started at the academy, his mother was dispatched to the frontlines. Not long after, Nan received news of her death.
The shock overwhelmed him—he fainted on the spot from grief. In his sorrow, he awakened the Sharingan without even realizing it, and then vanished from everyone's sight for several days.
Those who knew Nan thought he'd withdrawn to grieve. But to everyone's surprise, he reappeared not long after, seemingly having emerged from the pain of loss.
However, those familiar with Nan began to notice that he was no longer the same. The once cheerful child had grown quiet and withdrawn. He would sometimes mutter strange things about living another life in another world.
Most people assumed that Nan had become a little unhinged after the trauma of losing his mother. In times of war, such things were sadly all too common. No one paid much attention.
At this point, Nan finally understood everything.
He hadn't simply transmigrated into Uchiha Nan's body as a foreign soul—he had been reborn into this world after dying from illness in his previous life.
From the very beginning, Uchiha Nan was him—he had merely lost the memories of being Nan.
The trauma of losing his mother had triggered a partial recovery of those memories, which in turn caused confusion and abnormal behavior.
It wasn't until he suffered the ultimate betrayal—from the last family he had left—that the psychological collapse finally shattered the barrier, restoring all of his memories. The long-dormant personality of Nan fully reawakened.
This explained why he had never heard of anyone named Uchiha Han or Uchiha Nan possessing the Mangekyō Sharingan in the original Naruto storyline.
Because Uchiha Nan didn't exist in the original story. And without a younger brother, Han would have had no opportunity to awaken the Mangekyō—likely dying in obscurity somewhere, unnoticed.
Nan had acquired Han's memories through the technique Formless Reincarnation. It's important to note the distinction here: Nan's memories were Nan's own experiences—his five years of life in this world would naturally influence his current personality.
In contrast, Han's memories were transferred to him from an external source, experienced from a third-person perspective—more like watching a movie than reliving a life. They had no emotional impact on Nan's psyche.
From Han's memories, Nan confirmed that Han had indeed awakened the Mangekyō Sharingan under the belief that he had killed Nan.
Han had driven a blade precisely into Nan's chest, convinced he had pierced his heart. Under normal circumstances, that blow should have been fatal.
But by a stroke of luck—or fate—Nan's heart was slightly off-center, an unusual anatomical quirk. The short blade only grazed it, passing through his body without delivering a killing blow.
It was the sudden trauma that triggered the return of Nan's memories, sending him into a state of suspended animation—a false death.
Believing he had killed his little brother, Han was pushed into the emotional despair needed to awaken the Mangekyō Sharingan.
After that, Nan—now fully conscious and restored—woke up. And thus began the events that followed.
Nan also discovered that the one who told Han how to awaken the Mangekyō was none other than the aged Uchiha Madara himself. After thinking it through, Nan understood Madara's reasoning.
Madara was nearing the end of his life. He needed someone with the Mangekyō Sharingan to help him collect the Tailed Beasts and eventually carry out his resurrection plan.
In the original timeline, he must have screened countless candidates but failed to find someone suitable—until Uchiha Obito appeared unexpectedly, providing the perfect opportunity.
But in this altered timeline, Nan's existence changed the equation. Han became a viable candidate.
By pure chance, however, the plan to awaken Han's Mangekyō ended up benefiting Nan instead.
Madara could never have imagined that his carefully laid scheme would inadvertently create a monster—one who awakened the Eternal Mangekyō Sharingan at just six years old.