Here's a corrected and refined version of your text with more precise details from Naruto, better grammar, and improved readability:
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As Uchiha Tunan and the medical ninja stepped out of the yard, Sarutobi Shinnosuke, who had been waiting outside, asked curiously, "How is the situation?"
The medical ninja exchanged a glance with them, then gestured for them to follow him a short distance down the street.
After ensuring they were far enough away from prying ears, the medical ninja pulled out a notepad and began scribbling down a medical report. Without looking up, he said solemnly, "His condition is very poor. Likely due to prolonged psychological stress, I estimate he has only a few months left."
Uchiha Tunan froze for a brief moment before nodding, his expression unreadable. "I see..."
Sarutobi Shinnosuke placed a reassuring hand on Tunan's shoulder. "I'll arrange for you to take an extended leave from missions so you can spend time with him."
The medical ninja sighed. "Do you want me to officially file this report?"
Tunan shook his head. "No need. If it reaches the records, Grandpa might find out."
As Tunan turned to leave, back straight and expression calm, Sanhe Yuanliang, who had been secretly watching from the window, quickly wheeled himself back inside. Though he hadn't overheard the conversation, their body language told him everything.
So it's really come to this...
A moment later, Uchiha Tunan reentered the house, his face bright with a reassuring smile. "Grandpa, the doctor just praised you for your good health. I was worried over nothing. I'll go prepare dinner."
Sanhe Yuanliang chuckled softly. "No need to cook too much. You always make more than we can eat."
Half a Month Later – Konoha Hospital
Sanhe Yuanliang, now frail and skeletal, struggled to keep his eyes open. With great effort, he rasped, "Child… my will… it's on the bedside table. Don't grieve for me. Promise me… you'll live well… and be happy."
Uchiha Tunan held his grandfather's withered hand in both of his, his face calm. "Don't worry, Grandpa. I'll inherit everything from you and live on. If you feel tired, just close your eyes and rest. Don't force yourself."
A faint smile appeared on Sanhe Yuanliang's lips as memories of their time together flickered through his mind.
—"Grandpa, were you a ninja too?"
—"Grandpa, my name is Uchiha Tunan. What should I call you?"
—"The early bird gets the worm. I always wake up before dawn."
—"I think you should always stay with me… After all… I'm an ominous person."
His eyelids slowly fell, his breathing ceased, and the heart monitor let out a flat tone.
The attending nurse stepped forward. "The patient has passed away."
Another doctor placed a hand on Tunan's shoulder. "I'm sorry for your loss, child."
Tunan nodded, his voice even. "I understand. Please give me a moment alone with him."
The room emptied.
Sanhe Yuanliang had attempted to take his own life multiple times, but Tunan had never allowed it.
Because this was an experiment.
He wanted to see how much strength a person's death could bring him.
A warm current surged through Tunan's body, slowly spreading.
He closed his eyes and felt it.
His chakra reserves increased slightly, his mental energy sharpened, but more importantly—his mind was now filled with vast knowledge of ninja techniques.
Among them, the Santoryu (Three-Flow Sword Technique) stood out.
Though it wasn't as powerful as he had hoped, the gains were still substantial.
So chakra quantity is limited by an individual's endurance… If chakra alone determined strength, the Edo Tensei (Reanimation Jutsu) would make one invincible.
Tunan smirked. I still lack chakra, but as long as I keep collecting… that will change.
Two Days Later
Uchiha Tunan arranged a dignified burial for Sanhe Yuanliang.
Naturally, all of the old man's belongings—the house deed, money, and chakra short blade—now belonged to Tunan.
With his affairs settled, Tunan returned to the Uchiha Clan District.
His first destination? The residence of the Great Elder.
Inside the elder's home, the two knelt across from each other.
The elder's sharp gaze assessed Tunan, noting how much he had grown and the short blade strapped to his back. He nodded approvingly. "I suppose you didn't expect that old man to die so quickly."
Tunan took a sip of tea, his expression unreadable. "It's fine. The results were still worthwhile."
The elder chuckled, lifting his own teacup. "That man was infamous in his youth for being a miser—hoarding money and resources. But in the end, all of it ended up in your hands. That chakra weapon alone is quite valuable."
Tunan shook his head lightly. "Material possessions are secondary. The real treasure was what he passed down to me."
The elder frowned. "What could a civilian ninja possibly teach you?"
Tunan placed his tea down with deliberate calm. Then, without hurry, he raised his right hand.
At his fingertips, a minuscule sphere of compressed wind chakra formed.
With a flick, the tiny projectile shot forward—
BANG!
A clean hole appeared in the wooden wall, allowing a sliver of sunlight to stream into the room, illuminating the elder's face.
This was Fūton: Kūdan (Wind Release: Air Bullet), a B-rank jutsu that Sanhe Yuanliang had mastered.
Tunan had tried modifying it to function like the Rasengan, but controlling the rotation of such a tiny projectile proved too difficult.
The elder's eyes widened as he inspected the hole. "You… have the Wind chakra nature?"
Tunan adjusted his glasses with a composed smile. "I had my chakra nature tested recently. Surprisingly, I possess all five elements."