Genjutsu, by manipulating the target's brain Chakra through the five senses, makes the target see what the caster wants them to see, and can even fully control the target by manipulating their brain Chakra.
Although it mentions five senses, Genjutsu is mostly cast through sight and hearing. As for touch, smell, and taste, Genjutsu cast through touch seems to be only Izanami.
And for smell and taste, rather than calling them Genjutsu, it's more accurate to say they use drugs to induce hallucinations and control the target.
Orochimaru sat at the desk, twirling a pen in her hand. Her notebook contained her ideas for Ninja tools.
Genjutsu, without a doubt, was the Ninjutsu that posed the greatest threat to her. Auditory Genjutsu, it was said that the Death Sound Clan in the Land of Rice Fields excelled at sound-based Ninjutsu, which also included Genjutsu cast through sound.
She had found this information in the Konoha archives about various Ninja clans. Normally, as a Genin, she would never have access to such files, but she had a Hokage as a teacher who, upon learning of her thirst for knowledge, immediately gave her the green light.
If, initially, she had some prejudice against Hiruzen Sarutobi, after all, she had watched Naruto.
She remembered Naruto Uzumaki's childhood experiences vividly. After learning that his parents were Minato Namikaze and Uzumaki Kushina, the reputation of this kind-faced old man, Hiruzen Sarutobi, became very subtle.
For example, Minato Namikaze was the Fourth Hokage, who died protecting the Village, but after his death, his child lived in such a dilapidated place.
Another example: why did everyone in the Village know Naruto Uzumaki was the Nine-Tailed Fox? Weren't they afraid that Kumogakure, who wanted everything, would kidnap Naruto Uzumaki, the Nine-Tails Jinchuriki? Even with Anbu protection, if Kumogakure forcibly took the Nine-Tails Jinchuriki, given Konoha's strength at that time, they would definitely have to suffer in silence and absolutely wouldn't dare to go to war with Kumogakure.
Orochimaru defected, Jiraiya and Tsunade were nowhere to be found, and there were few strong fighters left in the Village. They couldn't just have Might Guy open the Eight Gates, could they? It was even questionable whether Might Guy could open the Eight Gates at that time.
Ultimately, why was such a confidential matter being spread so widely in the Village?
To appease the villagers' emotions?
Appeasing them shouldn't be done this way, should it?
Guiding all negative emotions towards a baby?
A foolish decision, and the villagers who hated a baby because of it were equally foolish idiots.
In reality, many things were not up to Hiruzen Sarutobi to decide.
Hiruzen Sarutobi, Utatane Koharu, Homura Mitokado, and Danzo Shimura always held different views on the same matter, leading to endless debates before reaching a consensus, with each wanting to persuade the others.
It must be said that Hiruzen Sarutobi's time as Hokage was quite stifling. If Senju Tobirama was absolute in implementing policies, with no one daring to refute him.
Then, the source of resistance for Hiruzen Sarutobi in implementing policies was not Ninja, nor was it the Villagers, but the Advisors and the Assistant Hokage.
How should I put it? Orochimaru thought Hiruzen Sarutobi's tenure as Hokage was not only stifling but also a bit cowardly, as he was simply too indecisive.
He would basically consider the opinions of the two Advisors and the Assistant Hokage repeatedly, and sometimes even be persuaded by them.
If Hiruzen Sarutobi's methods were a bit more forceful and resolute, Utatane Koharu, Homura Mitokado, and Danzo Shimura would only be fit to offer suggestions, not meddle in everything.
A single phrase, "I am the Hokage appointed by the Second!" would be enough to silence them. Daring to protest would be questioning the decision of the previous Hokage!
Would they dare? They would not!
In the original work, if Hiruzen Sarutobi hadn't been indecisive and sentimental, Orochimaru would have been long gone. At that time, Orochimaru hadn't even left the Heavenly Curse Mark on Anko Mitarashi, and didn't even have the chance to observe the world from within Anko Mitarashi's body.
Invisible contact lenses or eye modifications, and for sound-based Genjutsu, it's simpler to create Chakra-blocking earrings or headphones. Solutions exist, but I currently lack the equipment for this kind of research.
I'm broke!
Orochimaru casually tossed her pen onto the table, looking at the designs and dense annotations in her notebook. Another notebook lay beside it, its cover adorned with a Desert Eagle pistol, containing data on various firearms.
She found pistols much more effective than shuriken and Kunai. Given the technological level of this world, manufacturing firearms wouldn't be difficult.
How cool would it be to infuse bullets with various elemental Chakra and fire them!
Orochimaru had this fantasy by chance, so she recorded the firearm information she thought of. She also remembered that Ninjutsu was ineffective against Ōtsutsuki, and wondered if the Ōtsutsuki would still be so tough against intercontinental ballistic missiles.
Orochimaru speculated that if Chakra had not appeared in this world, its development would have been similar to Earth's.
The emergence of Chakra caused this world's development to severely lag, yet its technological level still reached its current state.
Technology is the primary productive force; technology can change the world!
However, without money, everything is just empty talk!
Forget it, I should go cultivate.
Orochimaru stood up, tidied the notebooks on her desk, and turned to look out the window. She wasn't worried about anyone reading her notebooks. The text in the notebooks, unless read by another Transmigrator from Earth, would only make even the Six Paths Sage scratch his head.
Outside, the sky had darkened, and the streetlights cast a dim, yellow glow.
Orochimaru left her home and quickly headed to the training ground.
The training ground was quiet at night, and Orochimaru greatly enjoyed such a peaceful environment. She formed hand signs, and as the smoke dispersed, four Shadow Clones appeared beside her.
Are the Root members here again?
Orochimaru noticed the Root Ninja secretly observing her. Previously, she thought they were Anbu Ninja, but they weren't. Although Root and Anbu Ninja dressed similarly, their operational styles were distinctly different.
She pretended not to notice them.
Her teacher was the Third Hokage, so what could the Root Ninja do to her?
"Wind Release: Night Wind."
Orochimaru casually raised her hand towards the lake, flicking her finger. Wind Release Chakra merged into the air, forming a small hurricane in the lake, stirring up a large amount of water that turned into mist and sprayed out, making the air much more humid.
Indeed, with mastery over Chakra nature transformation, developing one's own Ninjutsu isn't difficult; the challenge lies in what kind of Jutsu to develop.
Well, at least Goenitz, who likes to invite people to watch TV, isn't in this world.
Orochimaru was very satisfied with the Wind Release Ninjutsu she developed.
"What excellent Wind Release!"
Clapping sounds echoed as a man with his head and right eye wrapped in bandages emerged from the shadows, accompanied by two Anbu-dressed guards.
The newcomer was Danzo Shimura, and the guards beside him were naturally Root Ninja.
"Orochimaru, you truly are the genius praised by the Third Hokage. At such a young age, you've developed your own Wind Release Ninjutsu."
Danzo Shimura looked at Orochimaru, a hint of admiration and eagerness in his eyes. Such a talented child, it would be wonderful if she could join his Root.
"Anbu members?"
Orochimaru watched Danzo Shimura warily.
"No, I am not an Anbu member. I am Assistant Hokage Shimura Danzo."