Uchiha Ascendant: Rewriting the Ninja World

At Nawaki's gravesite in Konoha, the air was tense.

"Brat!"

Tsunade's sharp voice echoed as she observed Uchiha Yo's body trembling violently. Black, flame-like markings from the Cursed Seal Sage Body spread from his neck, intertwining across his skin.

Yo, deliberately triggering the cursed seal, was overwhelmed by a flood of negative emotions. His bloodshot eyes radiated a murderous aura as every muscle in his body spasmed under the intense strain.

"This is bad!"

Tsunade's brows furrowed as she realized that the power Yo was awakening wasn't the Sharingan—it was something entirely different.

Yo groaned, his expression contorted in pain. But when his gaze fell on Tsunade, he made a desperate decision, releasing the full restraint of the cursed seal and unleashing the chaotic force within him.

This was no accident. If anyone could save him in this state, it was Tsunade, the greatest medical ninja in the world.

Ninjas must be ruthless, even to themselves.

"What's happening?! This isn't just the Sharingan!"

As Tsunade channeled her Mystical Palm Technique, a diagnostic glow enveloped Yo's body. Her senses were bombarded by the chaos within him.

"Another power… This kid's not just an Uchiha?"

Yo's strained voice broke her concentration.

"Tsunade-sama… I… request deployment… to the battlefield!"

Before she could respond, the bloodshot red of his eyes deepened, and a single black tomoe slowly formed in each pupil.

The Sharingan had awakened.

Perhaps it was the grief of Nawaki's death, the torment of his conflicting loyalties, or the crushing weight of expectations that pushed Yo to this moment.

"Shut up, you stubborn Uchiha brat!"

Tsunade's hand lashed out, gripping his collar as they vanished from the gravesite.

---

Senju Compound.

Yo awoke to find himself in a pristine medical room. The faint scent of antiseptic lingered in the air. An IV drip was attached to his arm, the slow, rhythmic sound of fluid dripping into his veins grounding him in reality.

"What… happened to me?"

His voice was hoarse, and each word sent a sharp pain reverberating through his body.

"You're lucky you're alive, brat."

Tsunade's voice was curt as she glanced up from the medical scrolls she'd been studying. She crossed the room and stood over him, her arms crossed.

"What's… wrong with me?" Yo's expression feigned ignorance, but Tsunade wasn't buying it.

She snorted. "What's wrong is you awakened not one, but two kekkei genkai at the same time. Idiot."

His eyes widened in apparent shock. "Two… kekkei genkai?"

"Don't act surprised. It's rare, but it happens," Tsunade said. "Your Uchiha blood was always predisposed to the Sharingan, but the second kekkei genkai complicates things. It's wreaking havoc on your body."

Her explanation turned clinical as she began pacing.

"Kekkei genkai aren't always blessings. Bloodline clans occasionally suffer from conditions we call 'bloodline sickness.' It happens when the body can't handle the power of a kekkei genkai—whether from overuse, prolonged exposure, or innate incompatibility."

Tsunade's sharp eyes glinted as she gestured toward his IV.

"Your condition is more severe. Awakening two bloodline limits simultaneously has caused your body to rebel. That cursed seal on your neck isn't just a conduit—it's a buffer, holding your body together."

Her voice turned cold. "That serum you're on? A cellular stabilizer. There are maybe five people in the entire shinobi world who can make it. Each vial costs more than you'll ever earn in your life."

Yo's hand weakly reached toward the IV line as if to pull it out.

"Stop that!"

"I… I can't afford this, Tsunade-sama," he murmured, his tone laced with desperation. His trembling eyes betrayed a quiet resolve.

Tsunade's irritation flared. "What's wrong with you, brat? You'd rather die than accept help?"

Yo remained silent, his gaze fixed downward.

Tsunade sighed heavily. Damn these Uchiha and their insufferable stubbornness.

Her voice softened, though her words carried weight. "Nawaki's death ends here. I need you to stay alive and keep an eye on your clan."

Yo's head snapped up, a glimmer of hope in his blood-red eyes.

"You mean… you want me to uncover the traitors within the Uchiha?"

Tsunade bit her lip, suppressing a groan. His newly awakened Sharingan spun faintly, reflecting the all-consuming zeal typical of his clan.

"Think whatever you want, brat. Just stay out of trouble."

His expression hardened with determination. "For Konoha! I'll do whatever it takes to protect the village, Tsunade-sama!"

Tsunade sighed deeply. I finally understand what they meant about Uchiha stubbornness.

"Lie back. I need to examine this second kekkei genkai of yours."

Yo obeyed, hiding a satisfied smirk. His gamble had worked. Not only had he secured Tsunade's assistance, but he had also awakened the Sharingan.

With her resources, I can stabilize this second bloodline. Give me five or six years, and it'll be fully mine.

As Tsunade's hands glowed with green chakra, she began scanning his body.

"This second kekkei genkai… it's like a sleeping beast," she murmured. "It's deeply embedded in your cells, but your body rejects it. The cursed seal suppresses its effects, but the strain is immense."

Her eyes gleamed with academic curiosity. "Brat, do you realize how rare this is? Kekkei genkai research is one of the most valuable fields in the shinobi world. You're practically a treasure trove of medical data."

Yo remained silent, maintaining his facade of a loyal and stoic shinobi.

"Don't overuse this new power," Tsunade warned. "If you push it too far, you won't last another year."

"Understood," Yo replied, his tone subdued.

Inwardly, he was elated. With Tsunade's curiosity driving her, she'll ensure I survive. For now, I just need to play my role.

As Tsunade continued her analysis, Yo's thoughts turned to the future. The path ahead was treacherous, but the rewards were too great to ignore.

For now, he would bide his t

ime, strengthening his foundation. Soon, the power dynamics of Konoha—and the entire shinobi world—would begin to shift.