Classification

Pure Rinne Sharingan. 

Pure stood out to him as he did not recall the Samsara Copy Wheel having purity stages. 

A light bulb brightened inside his mind as he had a confounding theory.

He inspected it first, wanting more illumination on his Dōjutsu.

Pure Rinne Sharingan

It is a Dōjutsu Kekkei Mōra and the predecessor to the Rinnegan and Sharingan. The origin Dōjutsu is characterized by red scleroses and irides, with a ripple pattern spreading over the eyeball and nine tomoe.

Notice: The Sharingan and Rinnegan development is required to access these eyes. 

As he assumed. 

The description didn't explain much, but it meant a lot to him, someone with a pre-existing knowledge of the world. 

How quaint, he thought, smirking at that. Those noble clans are a by-product of the Rinne Sharingan obtained, and that's not even taken into the fact. They are pure, unlike Princess Kaguya Ōtsutsuki. 

However, she wasn't much of a Ōtsutsuki, especially with the numerous others of her clan that had shown up. 

The door at the end of the winding hall leading into the cold, dreary prison where he and a few other holdouts remain creaked open. 

Narrow paled and leaped to his feet as the footsteps drew closer. 

Without time to ponder, he made the hand signs and used the transformation technique. 

His neighbor pushed backward as the rat-masked shinobi stopped before his cage. 

The man stared at him, eyes scrutinizing him. 

"Sugaru, come on, I want to finish the shogi match." 

Huddled into the corner as he was, the Aburame eyes needled into him. 

"I sensed a spike of chakra coming from here." The Aburame elaborated. 

"Pssh. And? These wastrels barely can knee enough chakra to fight a genin and were chunin, plus the seals down here," he walked over, "him? Man, come on, he's useless, not even worth much outside the nine-tails in him." Cat masked Root-nin said without emotions. 

How had he forgotten about sensory perception? 

Surprised initially, he dived into the shop but recalled a small fact: Naruto was an Innate Sensor.

He had forgotten Naruto had that classification and with his newfound eyes.

He activated his Sharingan and immediately spied on one of the Aburame insects.

Inspect. 

Sidaichū

(Parasitic Sensing Beetles) 

They are a species of beetle-like insects that are off-shoots of Kidaichū. 

These beetles are bred and utilized by select members of the Aburame clan as chakra monitors. 

Notice: It is not necessarily a sensor, but the beetle will alert you best if it interacts with vast amounts of chakra. 

Smart of you, Sugaru Aburame. 

He had learned valuable information. One, they were being watched; two, the two ninjas were chunin. 

He had almost been found out.

He needed to be appraised of his surroundings and better understand the layout. 

He sat, recalling the information he had on sensors.

Let's start with kneading chakra. 

His attempts to learn the Sensor Technique hadn't gone as planned. In the end, he ended up in the shop purchasing the aforementioned techniques and picking up a few that surprised him. 

Once again, the costs were based on his capabilities. 

As a Uzumaki, he purchased the Karin Uzumaki Technique, which her mother had taught her. 

Kaguya Shingan: The Mind's Eye

CLASSIFICATION

Hiden, Ninjutsu

Class

Supplementary

RANGE

All ranges

Proficiency

1%

The Mind's Eye of the Kaguya technique allows one to sense chakra from exceptional distances in great detail. 

Notice: By activating your Rinnegan, you can use this technique to the fullest.

Area Scanning Technique had been the one he was trying to mimic from memory, foolhardy as that was, but Narrow was a man of action. At least he was, and now he was warring with an excitable child perception.

"Whatever," he grumbled. 

He accepted the purchase and was immediately illuminated where he had made the mistakes. Some areas still eluded him, but this was just the beginning.

By touching a solid surface with their hand or finger, the user can channel their chakra through the area, allowing them to scan it accurately. 

From this, a person can roughly map out entire structures and surroundings and determine the presence and location of targets in the surrounding area. Doing so allows the detection of threats, traps, and hidden rooms. 

Determining the weak points and fine details in a single structure is also possible.

He made no mistakes with the H and seals. His practice was extended more when his curiosity about the fox got the best of him, and he made one more guilty purchase in the shop.

Rain Tiger at Will Technique

CLASSIFICATION

Ninjutsu

NATURE

Water Release

CLASS

Supplementary

RANGE

All ranges

HAND SEALS

Bird → Rat → Ox → Monkey → Rat → Snake

It is a contact-type perception ninjutsu, allowing one to freely manipulate rain infused with the user's chakra.

He had some ideas. 

Not with that technique. It was useless in this scenario, plus he needed to be in an open space. His reasoning was another purchase he wanted to make. 

The Hidden Mist Jutsu.