Naruto: The Chosen Undead

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Chapter no.52 Kekkai Jutsu

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Sakura followed Kakashi, Genma, and Raido across the metal bridge, expecting something grand or imposing. But when she looked around, her first thought was how… ordinary it seemed.

Honestly, it wasn't anything special. The place felt more like an office than the heart of Konoha's defenses. The walls were plain concrete, gray and utilitarian, with no decoration or personal touches.

Genma said, turning to Sakura. "Bet you five ryo he's standing there with a coffee and the morning paper, halfway through, like he always is."

"Now that's just a losing bet."

Sakura gave them a confused look, wondering if they were exaggerating. But as they stepped inside, there he was: a man in his late twenties, dark eyes focused on the newspaper in his hand, a coffee cup in the other. He had brown hair and a small goatee, and wore a simple grey uniform—identical to the others working in the Barrier Corps. He looked… ordinary. Incredibly ordinary. Like he could have been a clerk at a library, not a barrier specialist in Konoha's security network.

Genma leaned over to Sakura, whispering, "Now he's gonna head to the fridge, grab a slice of sourdough, eat about two-thirds, sip his coffee, finish the rest, then wash it down. Watch."

To Sakura's surprise, Iwashi did exactly that, moving with an almost mechanical precision. He finished his coffee, tossed the paper cup into the trash, then folded his newspaper with care, as if he were completing some kind of daily ritual.

"Now he's going to come over and introduce himself like he's never met a stranger in his life," Genma said, smirking.

Iwashi finally looked up, his expression calm and unreadable. He gave a small nod to each of them. "Kakashi. Genma. Raido." Then his gaze settled on Sakura, who straightened under his steady stare.

"Iwashi Tatami."

Sakura nodded back, trying to keep a straight face. "Sakura Haruno. It's… nice to meet you."

He looked at her for a moment longer, his eyes giving nothing away, then nodded. "Haruno. You're going to shadow me. My job is to introduce you to the fundamentals of barrier work. Your job is to pay attention, take notes, and stay out of the way."

Sakura's heart sank as she realized she didn't have a notebook. She hadn't even known she was supposed to bring one, and Iwashi's sharp gaze made her feel like this was already some kind of test she was failing. Just as she was about to panic, Kakashi stepped forward, holding out a small, leather-bound notebook.

"Here, Sakura... You'll need this."

Relieved, Sakura took it, but her relief quickly turned to embarrassment as she noticed the cover. It was covered in tiny, doodled chibi Sasukes, all in different dramatic poses, with little hearts floating around them. Her face went bright red as she looked up to see Kakashi, Genma, and Raido barely containing their laughter.

She shot Kakashi a look, her blush deepening. I'll get back at you for this, Sensei. Shanaro! Inner Sakura fumed.

"You are a grown man, Kakashi-sensei," she muttered, clutching the notebook to her chest.

Genma snorted, nearly doubling over with laughter. Raido was shaking with silent laughter, trying to keep a straight face but clearly failing. Kakashi just shrugged innocently.

"It's important to have a personal touch, Sakura."

Suddenly, Kakashi gave her a gentle nudge, inclining his head toward Iwashi, who was glancing down at his watch with an air of practiced patience, as if he lived every moment according to a strict schedule.

Sakura quickly straightened, the last of her embarrassment fading as she focused on Iwashi, who finally looked up, his expression calm and collected.

"Any questions you have, write them down in that notebook. You can ask them at lunch. I'll also be giving you daily tasks. Small assignments to practice what you learn here. You'll be judged on consistency and attention to detail. If you can't keep up…" He paused. "Then don't waste my time."

"Understood, Iwashi-sensei."

Iwashi's expression remained neutral. "Good. Then let's get started."

"Better not dawdle. He's not exactly the patient type."

She hurried after Iwashi, her notebook clutched tightly in her hands as they wove through the winding corridors of the facility. Iwashi moved with purpose, never glancing back to see if she was keeping up. He pointed out various rooms and sections as they passed, his explanations clipped and efficient.

Sakura had a hundred questions swirling in her mind, but she kept them to herself, jotting them down in her notebook as they continued through the Barrier Corps HQ. To her surprise, though, Iwashi led her out of the building entirely and toward Konoha's southern gate.

The southern wall loomed above them, stretching as far as she could see, crafted from dense, sturdy wood. This wasn't ordinary lumber—it was said to be grown by the First Hokage himself, Hashirama Senju, using his Wood Release. The wall extended all around the village, up to the base of the Hokage Mountain, where it anchored Konoha's outermost defenses.

Without a word, Iwashi began scaling the wall, his chakra perfectly controlled as he walked up the vertical surface as if it were second nature. Sakura followed quickly, focusing to keep her own chakra flow steady as they climbed.

Once they reached the top, Iwashi stopped and knelt down, pulling a small pot of ink and a fine calligraphy brush from his tool pouch. Without any wasted movement, he dipped the brush in ink and began renewing a long, intricate strip of sealing script that ran the length of the wall. His strokes were precise, each one flowing smoothly into the next, as he moved down the ten-meter section with practiced ease.

Sakura watched, mesmerized. There was a calm efficiency in the way he worked, almost meditative. His brush barely hesitated, gliding across the surface in a steady, fluid rhythm. She could feel the faint pulse of chakra weaving into the symbols as he painted.

Once the seal was restored, Iwashi moved through a series of hand signs. He clapped his hands together, then slowly pulled them apart, drawing out delicate blue threads of chakra. Sakura gasped as the threads wove together, twisting and interlocking like fibers forming a cloth. They shimmered in the morning sunlight, forming a complex lattice that hardened into a barrier. Iwashi placed it carefully above the seal he'd just painted, and the barrier settled with a soft glow, integrating seamlessly into the invisible dome surrounding Konoha.

"Wow…" Sakura whispered, staring as the barrier faded into transparency, becoming part of the larger protective field.

Iwashi didn't respond, already moving to the next section. For the next few hours, he repeated the process over and over—renewing the seals, weaving the barrier threads, then moving to the next stretch of wall. Sakura followed along, observing him in silence, marveling at his endurance and precision. He worked tirelessly, barely pausing to breathe, until at last he stopped for lunch, sitting down on the edge of the wall and pulling out a simple bento box.

Sakura hesitated before sitting beside him, her notebook in hand. She glanced at him nervously, not wanting to disturb his rest.

"Questions?" Iwashi said, without looking up.

"Well… aren't you tired, sensei? You've been working non-stop for hours. I mean… doesn't this drain a lot of chakra?"

"Irrelevant. Either ask your questions now or eat your lunch. I gave you the time; use it."

Sakura bit her tongue, feeling a bit stung. She'd only wanted to show some concern. Fine, Inner Sakura said. If he wants questions, I'll give him questions.

"Alright then," she said. "Why is it called 'barrier ninjutsu' when you're using so much… well, fuinjutsu?"

Iwashi nodded, as if he'd expected this question. "There are two types of barrier techniques: Offensive and Defensive. Offensive barriers are often pure ninjutsu—used in combat to trap or attack enemies, usually temporary and chakra-intensive. Defensive barriers, on the other hand, rely heavily on fuinjutsu and are designed to be stable, long-lasting. Because of that, barrier work is usually categorized under ninjutsu."

Sakura's brow furrowed. "So… what's the formal name?"

"Kekkai Jutsu," he replied, his tone patient but precise. "It's split into two main types, offensive and defensive. The distinction is largely for the archives. Out in the field, people just call it 'barrier ninjutsu.'"

She nodded, jotting that down, but another question popped up immediately. "Why do we use fuinjutsu for defensive barriers? Isn't fuinjutsu… complicated? I thought it was one of the hardest paths a shinobi could take."

Iwashi raised an eyebrow, his mouth twitching slightly at the corner, like he almost wanted to smile. "Two questions at once. But I'll allow it. First, we use fuinjutsu because, unlike pure ninjutsu, a properly crafted seal can maintain a barrier long after we've left. If I tried to sustain this barrier with my own chakra alone, I'd collapse in less than an hour. The seal sustains it for us. Think of it as anchoring the barrier to the wall, rather than to my own chakra reserves."

Sakura scribbled furiously. "So… how often do you have to renew them?"

"Every twelve hours," he replied. "There's an entire branch dedicated to maintaining and replacing these seals around the village. It's constant work. Like sweeping the floors—if you miss even one section, you create a weak spot."

Sakura absorbed this, thinking of the endless dedication it must take to keep the entire village's defenses in place. "And… what about the fuinjutsu?"

"Fuinjutsu is complicated if you're trying to create new seals. Crafting a seal from scratch—designing it, testing it, ensuring it functions without backfiring—that's an art. And yes, it's one of the hardest arts a shinobi can pursue. But here, we're not creating new fuinjutsu. We're following a blueprint. Every single seal I've painted today was designed by the Second Hokage himself. A masterpiece of efficiency."

He gestured to the faintly glowing strip he'd just completed. "All we do is replicate it. Copy and maintain. We're not trying to match the genius of Tobirama Senju. We're just preserving his work. So for defensive barriers, it's about precision and memorization, not innovation."

"So… I'm learning defensive barriers?"

Iwashi nodded.

"What if I wanted to learn offensive barriers?"

"Offensive barriers? That's a different story. Those are jutsu meant for the battlefield—traps, containment fields, techniques to lock down or even crush enemies. They're volatile, require immense chakra, and a much deeper understanding of elemental ninjutsu. To even begin learning them, you'd need to be at the level of a Tokubetsu Jōnin."

Sakura's eyes widened.

"Focus on the basics, on the defensive side, and perhaps… one day."

Sakura nodded, feeling both humbled and motivated.

"Honestly, I think I need to digest everything I've learned today. Maybe I'll ask more questions tomorrow. For now… what's my assignment?"

Iwashi gave a small, approving nod. "Good. Knowing when to absorb information is just as important as knowing when to seek it." He held up his hand, tapping his fingers thoughtfully. "Your first task is simple, but foundational. You need to learn how to create a single chakra thread."

Without responding directly, Iwashi brought his hand to his mouth, wetting his thumb and forefinger. Then he pressed his fingers together, drawing them apart slowly. A thin line of mucus stretched between them, glistening in the sunlight. He looked at her and gave a tiny smirk.

Sakura's lips pursed in disgust.

Iwashi chuckled, amused by her reaction. "Look closer, Haruno. Think of this like the structure of a chakra thread. Just like how the mucus is connecting my fingers, a chakra thread is formed by focusing and stretching your chakra into a thin, cohesive line. The key is in control—keeping it steady and connected, even as you move."

She looked at his fingers again, this time with more focus, trying to see past the unpleasantness. "So… tension?"

"Precisely. You're creating a link between two points and holding it together, just like this line of mucus. But with chakra, it's a lot harder. If your control slips, the thread will break or dissipate. You need to keep it focused and stable, but also flexible, so it doesn't snap. The thread should feel almost… sticky. Cohesive. Like it wants to cling to itself."

"So… that's how you do it."

Iwashi's eyebrow arched. "What do you mean?"

Without hesitation, Sakura pressed her palms together, focusing her chakra between them. She took a deep breath, then slowly pulled her hands apart. A single, faint blue thread of chakra stretched between her fingers, shimmering softly in the light.

Iwashi's eyes widened slightly, and he just stared, speechless for a moment.

"How…?"

"Well, I've been watching you all morning, trying to understand how you were creating those chakra threads for the barrier. I kept going over it in my head, breaking down each step. Your explanation with the… um… mucus analogy helped me see what I was missing. I wasn't applying enough tension, or keeping the flow steady."

Iwashi blinked, then let out a quiet chuckle. "You're a quick study, Haruno." His expression softened. "I wasn't expecting you to pick it up that fast. You have a bright future ahead of you."

"Thank you, sensei. I'll do my best not to disappoint you."

Iwashi nodded. "Nothing more I can ask. But since you've already completed the first assignment… let's move on to the next."

"I'm ready. What's next?"

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[ Personal Note: First off, thanks a ton to all of you for sticking with this story. Seriously, you guys are awesome. Now, if you're interested in supporting me on P treon, let me just say that over there, I post these massive 5k-word chapters. But heads up, if you're jumping to P treon, you'll need to start from Chapter 25, since that's where this chapter lines up with the content there.

To everyone here just reading along, please don't forget to leave a comment! Honestly, your comments make my day, and they let me know you're as invested in this story as I am. So yeah, thanks again, and I hope you have an amazing rest of your day!