Kazuki could passively sense every single person near him but he couldn't sense the insects inside shino's body, maybe it was because they have very low chakra, he didn't know for certain.
When he closed his eyes and focused to sense the insects inside Shino's body, he was able to do so.
He thought, 'There's probably a lower limit to this technique so that I don't sense every single chakra signature and overwhelm myself. I have to find a way to reduce this lower limit somehow.'
Naruto's voice woke Kazuki from his thoughts, "Hey Sensei, teach me how to do that too."
Kazuki looked down at him and shook his head. "Not yet. You should learn the standard clone jutsu first."
Naruto crossed his arms and grinned. "So if I learn the clone jutsu, will you teach me this?"
Kazuki rubbed the back of his neck, giving a hesitant smile. "Ah, sure."
Kazuki wasn't too worried about making that promise. Naruto doesn't learn the clone jutsu till his final year in the academy either way.
Kazuki dispersed the shadow clone he already had active. A small puff of smoke cleared, and he immediately make a new one. The new clone gave a brief nod and walked to the back of the training area, standing completely quiet with its eyes closed to train the Mind's Eye of the Kagura.
Ino stepped forward, her eyes shining. "Sensei, Show us some more jutsu!"
"Alright, back off a little bit," Kazuki warned, waving them back. Once the kids gave him some space, he brought his hands up and formed a single hand sign.
'Fire Release: Fire Fox.'
Several balls of bright flame flared into existence around Kazuki. He moved his hands through the air, and the fireballs danced around him, following the exact motions of his fingers. The kids gasped, watching the display like it was a festival show. Even Sasuke had dropped his usual indifferent attitude, leaning forward to watch the flames closely.
"Kazuki-sensei, how did you do that?!" Naruto yelled excitedly, jumping on his toes.
Kazuki kept the flames moving. "Just keep training hard, and one day you will be able to learn and make all sorts of ninjutsu." He lowered his hands, letting the fireballs fade away into smoke. "And also, drop the 'sensei'. I'm just here to show you some ninjutsu."
Sakura raised her hand, looking confused. "But how did you do that with just one hand sign? Ninjutsu requires many hand signs to perform."
"That's not exactly true," Kazuki explained, looking at her. "The hand signs are used to make chakra flow in our body in a certain way. But you can simplify and reduce the hand signs if you learn to control that flow on your own."
The kids looked amazed. Kazuki smiled and took a step back. "Alright, I'll show you one final ninjutsu." He raised his hands and rapidly moved through a series of hand signs. "Watch closely, you might not see something like this again for a while."
'Fire Release: Great Dragon Fire Technique!'
Kazuki inhaled and blew out a massive volume of fire from his mouth. The flames roared as they shot upward, twisting and taking the shape of a giant dragon high in the sky above the training ground.
Looking up at the giant fire dragon, Kazuki scratched his cheek. "Uh oh, I might have overdone it a little."
"Wow, that was so cool!" Naruto yelled. The whole ground erupted in loud cheers from the rest of the kids.
Kazuki turned to them with a wave. "That's it for today. Keep training hard and become great shinobi."
Kazuki silently dispersed his shadow clone standing in the back. A rush of memories immediately hit his brain. His clone had successfully figured out how to set chakra limits to his passive sensing ability. He didn't need to be afraid about being spied on anymore.
His eyes narrowed slightly. 'I don't even know how much he already knows about me, that bastard,'
A moment later, Iruka walked over, clapping his hands to get the students' attention and leading them back to class.
With his job done, Kazuki turned and left the academy grounds to go collect the reward for his mission.
He got 5000 Ryo from this E rank mission.
'I have around 500k Ryo saved up now. I wonder how much a house with a large yard for training would cost.' He thought as he headed for the Uchiha compound.