As a Grey Knight In Naruto

Chapter 36 – Growth Beyond Flesh

The scent of herbs and sterilized cloth filled the morning air in the clinic. Sunlight slanted through the windows, illuminating motes of dust dancing gently across the wooden floors. Outside, the Tanzaku Quarters stirred lazily with the usual bustle, but within the walls of the small medical center, things were quiet, almost peaceful.

Hajime moved with practiced ease through the backroom, sorting newly ground salves and aligning patient records. His fingers worked with surgical precision, hands steady, even as he noticed, again, how tight his sleeves had become.

He glanced down.

His forearms, once slim and soft with the look of a young teenager's, were now corded with lean, dense muscle. The skin over them was smooth, but thicker somehow, more resilient. He rolled his shoulders. Even the bones beneath seemed broader than before. The clinic uniform, tailored to fit loosely for movement, now clung uncomfortably to his chest and upper arms.

The changes had accelerated in the last three days. His spine ached faintly at night, but not from pain, more like growing pressure. The Ossmodula had begun its work.

And it wasn't subtle.

Across the room, Shizune passed by with a clipboard, halting mid-step as she blinked at him.

"…Did you get taller?" she asked, squinting slightly.

Hajime paused, his expression neutral. "I stretched a little."

She narrowed her eyes and tilted her head skeptically. "No, seriously, are you having a second puberty or something?"

He gave her a polite smile and returned to his work without answering. Shizune frowned but let it go with a faint, amused shake of her head.

That afternoon, as they tended to a middle-aged merchant with a minor stomach obstruction, Hajime gently guided a diagnostic chakra stream through the patient's abdomen, then administered a medicinal compound Tsunade had taught him. The technique was delicate, requiring a precise blend of chakra, physical feedback, and anatomical knowledge.

Tsunade watched from the corner.

Her golden eyes didn't blink as Hajime performed the technique flawlessly, his movements efficient, his posture relaxed, his chakra control... unnaturally smooth.

When the procedure ended, the patient sat up, groaning with relief. Tsunade dismissed him with a few words and turned toward Hajime.

"You've been getting stronger," she said.

He looked up calmly. "I've been keeping up with your scrolls."

She walked up, close enough to reach for his shoulder. She didn't, but the impulse was there, hovering in the air between them. She studied him, not as a mentor, but as a doctor examining a phenomenon.

"You look different," she added, softer this time.

"Different how?"

"You're growing too fast. Your build. Posture. Hell, even your chakra presence feels… denser."

"Is that bad?"

She didn't answer.

Instead, she brushed past him, then stopped and turned back. "After clinic hours, come see me."

Late in the afternoon, when the last patient left and Shizune went out for supplies, Hajime found himself sitting shirtless on the edge of the examination table behind the clinic curtain.

Tsunade stood behind him, her fingers lit with a soft green diagnostic glow.

Her face was expressionless at first, calm, calculating.

Then she stiffened.

"What the hell…" she whispered.

Her chakra scanned deeper. He could feel the warmth of it flowing down his spine, weaving around his ribs, analyzing each vertebra. Her chakra paused at the chest, and then surged in a loop as if confirming what it had sensed.

"Your bones," she murmured. "They're… growing. Too fast. Too precisely."

"I do take a lot of calcium," Hajime offered dryly, good thing hajime used his psychic ability to hide his second heart, otherwise he might even be treated as a monster.

"This isn't calcium." She stepped in front of him, eyes narrow with disbelief. "This is like… your skeletal structure is reinforcing itself. Your rib cage, it's not normal. It's growing inward. Almost forming a shell around your organs."

She reached out and placed her palm gently on his sternum.

Her chakra pulsed.

There it was: rows of thickening ribs, slowly interlocking across his chest, knitting together like some biological armor plate.

It was subtle still, like the beginnings of an exoskeleton. But the signs were clear.

"This shouldn't be happening," she muttered.

Hajime remained silent. He felt a strange warmth in his chest, not fear, not pride. Something more like… regret. He hated lying to her. She had been his teacher, his shield.

And now, she stared at him like he was something else.

"Do you feel any pain? Numbness? Discomfort?" she asked quickly, switching to full medical mode.

"No. I feel stronger. Clearer. Like my body's finally catching up to where it's supposed to be."

Tsunade studied him for a moment, then slowly let her hand fall.

"There's no disease," she admitted reluctantly. "No chakra imbalance. It's like your body knows exactly what it's doing… but I've never seen anything like this. Not in any clan. Not in any experiment."

He met her eyes. "Then I guess I'm lucky."

She looked at him a little longer. Then she sighed, an old, tired sound, and stepped away.

"If anything goes wrong," she said, voice lower, more serious, "you come to me. No secrets. No acting tough. I don't care how weird this is, I want you alive, not brave."

Hajime bowed his head slightly. "Understood."

That night, after dinner and a few light conversations with Shizune and Tsunade under the paper lanterns outside the clinic, Hajime slipped away as usual, into the forest, into the silence.

But his mind lingered.

Not on fear.

But on the look in Tsunade's eyes.

She wasn't angry.

She was worried.

She saw the transformation now, not as something dangerous, but as something lonely. Something that no longer fit within the shape of what she understood.

He would have to be careful.

He wasn't done changing yet.

The Ossmodula had only begun its work.

And there were more organs to come.

But for tonight, beneath a canopy of stars, Hajime sat cross-legged on a smooth stone beneath the earth.

His spine stretched slightly.

His ribs shifted.

And with every breath, he grew,mbit by bit, into something this world had never seen.

End of Chapter 36 – Growth Beyond Flesh