Naruto: The Medical Ninja

Chapter 338: Chapter 335: Tenseigan – Going Beyond Byakugan

”Tenseigan... You want to create a real Tenseigan—going beyond Byakugan.”

Taro’s pale eyes widened, processing the scale of what Ryu had just proposed. The moon’s reflection hung perfectly on the water’s surface, undisturbed by the night breeze. Rocks and forest surrounded them, dense and silent.

Taro’s breath caught. The logic was undeniable—a single set of eyes managing atmosphere, gravity, space, and teleportation. Everything the sacrifice system struggled to maintain is solved.

Taro said, ”No one has awakened a Tenseigan since Lord Hamura himself.”

”It’s only a possibility,” Ryu said before Taro could spiral into doubt any further.

The silence between them carried weight. Taro wasn’t dismissing the idea. He knew Ryu didn’t float possibilities without pathways to realise them. The clan leader’s mind was already running calculations—what such power could mean, what it would cost, what it would require.

”What do you require to turn this possibility into a reality?” Taro asked.

Ryu met his gaze. ”I apologise in advance if this offends you...”

Taro’s jaw tightened. Whatever came next would test boundaries.

”I need genetic material from someone who awakened the Tenseigan in their lifetime,” Ryu said. ”From Hamura Otsutsuki himself.”

Taro’s shoulders squared. The implication was immediate—disturbing ancestral graves, actions that could fracture clan unity if discovered.

Ryu didn’t wait for objection. ”It’s fine if you can’t do it. I’d be offended too if someone asked me to grave-rob my ancestor.” He paused, letting the acknowledgement settle. ”I have alternate plans. And my alternate plans have their own plans.”

The statement landed with the weight of competence, not arrogance. Ryu had already thought three moves ahead. Taro’s expression shifted through several calculations before he spoke.

Taro went silent. He looked at the moon’s reflection on the water, then back at Ryu. When he spoke, his voice was measured. ”I have hair samples... . Brushes made from Lord Hamura Otsutsuki’s hair. They’ve been passed down as clan relics.”

Ryu’s face lit up—the first genuine excitement in this conversation. He controlled it quickly, but the microexpression spoke volumes. ”That can work.”

”We bury clan members outside the dome in coffins,” Taro continued. ”Decay is extremely slow in the near-vacuum environment. If you need tissue samples from the graves—”

”That won’t be necessary,” Ryu cut in cleanly. ”I have a backup plan too... so hair samples will be enough... I think.”

Taro’s brow furrowed. ”What was your backup plan if I didn’t have the samples?”

”Toneri Otsutsuki.” Ryu’s tone shifted to explanatory. ”Sometimes a child is born with bloodline limit purer than their peers—closer to the origin, as if genetics remembered the source. Just like Hanabi Hyuga and Neji Hyuga on Earth with a much purer Hyuga bloodline, Toneri Otsutsuki is an anomaly in the current moon generation with a bloodline purer than others.”

Taro’s response came dry, with edges of sarcasm but not hostile. ”It must be wonderful to know the future.”

Ryu met his eyes, his tone shifting to something heavier, more sincere. ”Yes. With great power comes great responsibility.”

The line hung between them. Ryu added quieter, ”I’ve done things to make the outcome better than what I know. It’s not an easy thing.”

Taro said nothing for a moment. His expression softened a fraction. He remembered the dreamscape visions—fragments of futures Ryu had already seen, futures the young man was actively trying to reshape.

Ryu’s voice returned to strategic clarity. ”You might be disconnected from civilisation here, but there will come a time when Earth faces grave danger—and that danger will reach you too, because you’re dependent on Earth through the device.”

”You’re talking about the main Otsutsuki family,” Taro said quietly. Not a question. A confirmation.

Ryu nodded. ”After a decade, they’ll set foot on this planet again—if they haven’t already.”

”It’s your choice if you don’t want anything to do with Earth’s wars. But know this—if your neighbour’s home is on fire and you do nothing, the fire may spill onto your home next. So my advice is to prepare for that fire and keep your buckets filled.” Ryu’s gaze held steady. ”A great leader wishes for peace but is always prepared for battle.”

Taro absorbed the words, weighing them against what he knew and what he’d seen in those dreamscape fragments. He gave a single, slow nod—acknowledgement, not agreement, but recognition of the threat’s reality. ”I’ll arrange blood samples. Toneri, a few exceptionally strong clan members including myself, and one very distantly related member. I’ll have them ready before you leave.”

”I’ll start working on the seals I recorded from the transmitter device tomorrow,” Ryu said. ”For now—let’s go back. I want to see how Akihiro’s training is progressing.”

Taro nodded.

They dived into the Earth-side lake, swimming through the dimensional tunnel that connected worlds. At the midpoint, Ryu glanced at the transmitter device—the spherical alien metal machine etched with complex seals, collecting and transporting senjutsu chakra. His eidetic memory had already captured every detail. Tomorrow’s analysis would begin translating those patterns into actionable improvements.

They surfaced on the moon-side.

The training arena was active when they arrived. Akihiro stood at the centre, jaw set in concentration. A Yin chakra sphere hovered before him, trembling in mid-air. He focused on Yang chakra, trying to attract the opposite-polarity sphere across the space. The sphere vibrated under opposing directional pull—Akihiro pulling one way, Kiyomizu Otsutsuki pulling the other.

Kiyomizu stood opposite, calm and controlled, applying corrective pressure to test Akihiro’s ability to maintain focus under resistance.

”How are things going?” Ryu asked.

Kiyomizu turned, a warm smile crossing his features. ”Ryu-kun. He’s progressing remarkably.” He gestured towards Akihiro. ”Better than any moon child his age. His learning speed is comparable to yours, honestly.”

Ryu smiled, outwardly modest. Inwardly, satisfaction registered. ”InstinctGPT performing exactly as designed. Accelerating learning, letting him absorb instinctive patterns that take others years to build.”

The upgrade wasn’t just speeding up Akihiro’s progress—it was fundamentally changing how he processed training data.

Kiyomizu’s tone shifted slightly, still warm but realistic. ”But he’ll have a difficult time when it comes to visualisation. It requires the dreamscape, or someone who wasn’t born blind, to enter his mind and help him visualise things.”

The obstacle was structural. Akihiro was blind and had no lived visual memory. His brain possessed no reference library for what ”seeing” meant.

Taro added, his voice carrying realism without pessimism, ”Without the full Otsutsuki bloodline, even with dreamscape help, it will be a long process. But we’ll teach him to see through inner chakra senses. That’s a good foundation and our method of sensing combined with what you have already taught him will carry him a bit but do not expect 100% efficiency.”

”If problems arise at a later stage,” Ryu said. ”I’ll think of a solution. I think you have already taught him the basics; I will take it from there. I will continue training him.... We have a few hours left so let me join you two.”

​

Ryu stayed for the rest of the session. Akihiro alternated between Yin and Yang training exercises, cycling chakra through different pathways, and learning to feel the pull and push of opposite energies. Ryu, Taro, and Kiyomizu offered corrections—timing cues for chakra flow adjustments that improved control precision and verbal guidance for where to feel the chakra moving through his system.

The rhythm was efficient and collaborative, the work of skilled teachers refining a talented student.

When the session ended, Ryu and Taro moved towards farewells. Kiyomizu and Akihiro joined them.

”Thank you for your hospitality, Lord Taro,” Ryu said simply.

Taro produced materials he’d prepared during the training session. Multiple vials, carefully labelled.

”These are blood samples. I have already talked to Kiyomizu about your plan and he agreed to give Toneri’s blood samples. And here are samples of some exceptionally strong clan members, including myself, and one very distantly related moon clan member.”

Several brushes followed—functional items in moon culture—but each carried ancestral significance. ”And these brushes are made from the hair of past leaders and clan members.”

Then Taro presented the final item. The final item was a specially encased brush, with a gold casing and valuable wood from antiquity. The craftsmanship distinguished it ceremonially from the others, but its function remained the same.

”These brushes have been passed down through generations,” Taro said, his voice carrying formal weight. ”This one carries the greatest weight... it contains Lord Hamura Otsutsuki’s hair. Ryu-kun, I hope you succeed.”

Ryu accepted the materials, opened his storage scroll, and placed the vials and brushes inside it, absorbing them into its dimensional pocket.

Ryu met Taro’s eyes. ”I’ll keep this project a secret. And I’ll be careful to leave no records or leftovers of it.”

The pledge carried weight. Ryu understood what he held—the genetic blueprint of an entire bloodline, access to secrets that could reshape or destroy a civilisation depending on who possessed them.

”I’ll start working on this assignment today,” Ryu said. ”It’s almost morning—I should leave.”

His internal chronometer placed dawn in Fire Country less than an hour away. Time to move.

Taro’s Byakugan activated. Veins bulged at his temples, pale eyes glowing faintly in the arena’s light. He connected to the Tenseigan device—a remote link via Byakugan, a clan leader privilege granted through bloodline and authority.

Space bent. Light scattered into prismatic fragments around Ryu and Akihiro, sparkling like stars breaking apart. For Ryu, the world blurred—grey walls of the moon facility dissolving, replaced by wooden beams and familiar furnishings. The training arena faded, and his room in the Hamura compound materialised around him. Akihiro stood beside him, adjusting to the seamless transition.

From Taro and Kiyomizu’s perspective, the two forms shimmered with that same starlit quality before fragmenting into nothing. In one moment, they were present, and in the next, they stood in his bedroom.

A/N:

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