The week flowed by and Kazeo was again in chakra deprivation room and was learning about chakra field expansion.
"Chakra field expansion isn't about brute force, kid." Touka said, arms crossed as he leaned against the wall. "It's about feeling the space around you like it's an extension of your skin. You push gently. One direction at a time. You rush it, you'll just waste chakra and lose control."
Kazeo nodded, absorbing every word. 'like mapping an invisible blanket around me. No need to stretch all at once—just... one edge at a time.'
"And remember" Touka added, voice calm but firm, "start with the front. Then the back. Then sides. Don't try all at once."
Kazeo gave a short nod. "Got it."
The days went by in a similar rhythm and Kazeo finally learned how to expand his chakra field. The concept itself wasn't that hard to grasp, but it still took him time. After all, it was his first time trying something like this.
He had to focus on expanding the chakra field in one direction at a time—forward, then backward, then to each side. It sounded simple enough, but actually doing it with precision and control was another matter. Still, after repeating it again and again, it started to feel more natural.
During those days, he also ended up talking to Touka more. Their conversations were short but helpful. One day, Touka casually mentioned something that stuck with him: the reason Kazeo had managed to sense the chakra cubes so quickly, within just two days was because of his unusually high level of concentration.
Most people struggled in that sensory deprivation room. Having three of your senses sealed off wasn't easy to handle. It messed with your balance, your mind, everything. Touka explained that only a very small number of people could stay calm and focused enough to get results that fast. Sensors usually had to build resistance to that environment over time.
Kazeo hadn't thought much of it at the time, but hearing that made him pause. Maybe it's because my soul is strong... He didn't say it out loud, but it made sense to him.
A week later, his training was finally complete. He could now sense chakra clearly within a range of seven meters. He met Touka on his last day to say goodbye.
"Thanks for teaching me." Kazeo said sincerely. His tone was calm, but there was a quiet respect in it.
Touka gave a short nod, then added, "If you ever manage to expand your chakra field to 400 meters… and you're at least a Genin by then, you'll be allowed to use this room again."
Kazeo raised an eyebrow.
"Of course, there's an entry fee," Touka said with a small smile. "But you won't need to be in the sensory department to access it."
Kazeo nodded. '400 meters… that's a long way to go.' he thought. 'But not impossible.'
-----
These days, time was passing with a steady rhythm for Kazeo. While a part of his focus stayed on expanding his chakra sensing range, a greater portion of his energy had shifted toward taijutsu.
Down in the hidden training ground he'd discovered, the sound of fists clashing echoed regularly—his clones serving as both sparring partners and silent mirrors of his form. The academy's final exams were only about a month and a half away now, and Kazeo wasn't about to waste time.
He increased his taijutsu sparring sessions, sharpening his movements. He also spent time throwing shuriken until his fingers ached. After finishing his evening round of training, Kazeo sat for a moment, breathing deeply as he looked up at the sky. Sweat clung to his skin, but his mind was elsewhere.
It's been almost three months… he thought, lips tightening slightly.
The orphanage. It had been nearly three months since he'd last visited the place and the people—who gave him a roof and warm meals when he arrived in this world.
He could visit them more often. No one was stopping him. But he didn't.
In his past life, Kazeo had learned something many adults eventually come to understand: the more often you show up in someone's life, the easier it is for them to take your presence for granted. Familiarity without absence can quietly dull appreciation. Not always out of malice but it was just human nature.
So, he made sure every visit counted.
'It's better to let them miss me a little… then show up with something to smile about.' he thought as he rose to his feet.
Tomorrow, he'd visit them. He'd show up with bags full of gifts and a calm smile on his face. Not because he craved attention or needed to be remembered, but because he genuinely cared.
-------
Next day -
Kazeo walked through the familiar path leading to the orphanage, the setting sun casting long shadows over the small wooden building. It had been nearly two years since he joined the Academy, and he made it a habit to visit the orphanage every two to three months. Each time, he brought small gifts—simple things like sweets, wooden toys, or colorful scarves.
As he stepped inside, excited squeals erupted around him.
"Kazeo-nii! You're back!" a tiny girl with twin pigtails shouted, running toward him.
"Did you bring something this time?" another child asked eagerly, eyes twinkling.
Kazeo chuckled, reaching into his bag. "Of course. Who do you think I am?" He pulled out a set of colorful spinning tops and a small bag of sweets. The children cheered, swarming him in a flurry of tiny hands and bright smiles.
"You always bring the coolest things!" a boy said, spinning a top on the ground with a big smile.
"Well, that's because you all are super cool too," Kazeo said, ruffling the hair of the nearest kid.
Then he looked around, turning his head this way and that. "Hmm… where's Grandma?"
The girl with twig-like pigtails raised her hand. "Oh! Grandma said she was going shopping a while ago!"
Kazeo nodded. "Got it. I'll see her later then. But guess what, I brought something extra awesome today! It's almost like magic! Wanna see?"
All the kids instantly crowded closer as Kazeo pulled out a roll of thin string and two small cups, eyes wide with curiosity.
"This is a secret talking device! When you whisper into one cup, your words will travel all the way to the other cup. It's like a ninja trick!"
"Really?!" they gasped in amazement.
Kazeo handed one cup to a child and gave the other to another kid standing a little farther away. "Try it! One of you whisper something, and the other one listen."
The children did as he instructed. As one whispered, the other's eyes widened in shock. "I can hear it!" he shouted excitedly.
Gasps and excited claps erupted among the kids. "Really?!" they exclaimed, eager to try it themselves. They took turns whispering into the cups, squealing with delight when their words reached the other side.
Then, a boy with a curious expression raised his hand. "Kazeo-nii, is there a tiny person running in the string carrying our words?"
Kazeo smiled and said, "Hmm, not quite! When you talk, your voice makes teeny-tiny wobbles like little waves. Those waves zoom through the string, just like when you feel a door wiggle if someone knocks on it. Cool, right?"
A little girl tilted her head. "Oh! Like when I hit the table, and my cup moves a little?"
Kazeo nodded. "Exactly! When something shakes, it can make nearby things move too."
Another child's eyes lit up. "So... if something shakes a lot, it can move things even more?"
Kazeo smiled. "That's right. The stronger the shake, the bigger the movement. Think of a drum. When you hit it, the skin shakes and makes sound. Vibrations can be really powerful."
His words lingered in his mind as the children kept experimenting. 'Vibrations can be really powerful.'
His thoughts drifted deeper. 'If vibrations could carry sound, what else could they do? If they could shake a drum to make a loud noise... if they could shake the ground during an earthquake... could they be used in a different way? A sharper way?'
His mind wandered to blades, kunai, swords, even simple tools. If a sharp edge could be made to vibrate at an extremely high frequency, wouldn't it slice through things more easily? Instead of just pushing through an object, it would be shaking at such a rapid pace that it could cut smoother, faster like how a saw works compared to a normal knife.
His breath hitched slightly at the realization. If he could apply chakra to create these high-frequency vibrations, he could refine a completely new cutting technique. Something more precise, more deadly.
A little tug on his sleeve pulled Kazeo back to the moment.
"Kazeo-nii?" the little girl looked up at him with wide eyes. "Are you okay? You looked like you were thinking super hard."
He blinked, then laughed softly. "Yeah, I was just thinking about a fun new jutsu."
"Oooh! Will you teach it to us one day?" she asked, her face lighting up.
Kazeo smiled, feeling warm inside. "Maybe! But for now, let's keep playing with our talking string, okay?"
As the children cheered, Kazeo's mind was already working for how to add vibration to weapons.
And that's how this little interaction unknowingly laid the foundation for vibrating weapons in the Ninja world… though history might misinterpret his contribution.... especially women's.