How was all this accomplished? It's actually quite simple: everything Mano Seiichiro saw was fake; the scenes he witnessed were all made to him by Aizen.
From the moment he looked up at Aizen, he was already under Aizen's Genjutsu. It seemed as if he jumped back and drew his sword, but in reality, he remained seated, motionless.
As for trying to break free from Genjutsu by disrupting the flow of Chakra, that's completely impossible.
If genjutsu comparable to the Mangekyou Sharingan's eye techniques could be so easily dispelled, then Yuki wouldn't have such high hopes for bloodline limits that manipulate the five senses.
But there's no point in saying all this now; it's all over. Aizen easily used his Five Senses Manipulation to eliminate a Jonin, and the Jonin's body was perfectly preserved, except for a wound on his neck.
He walked to the corpse, took out a scroll to collect it, and then left Kumogakure. The journey was peaceful, and nothing unexpected happened.
Only two days later, when the people of Kumogakure had a mission for Mano Seiichiro, they discovered that Mano Seiichiro had disappeared from the village without any record of leaving.
This immediately shocked the high command of Kumogakure, who thought a powerful enemy had infiltrated the village. They launched a massive search, but instead of finding the enemy, they uncovered a number of spies within the village.
However, all of this was no longer Aizen's concern. At this moment, he was heading towards the Exchange Shop.
On the other hand, after Kōki successfully released Aizen, he went to find Hiruzen Sarutobi. He didn't beat around the bush and directly told Hiruzen Sarutobi that he wanted to obtain all of Tobirama Senju's experimental research records.
He believed that Hiruzen Sarutobi, who valued him highly, would agree. However, an unexpected event occurred: Hiruzen Sarutobi said he could have these things, but he had to complete some tasks. After completing the tasks, he would receive the research records as a reward.
Only in this way could he prevent others from gossiping about him giving these things to him. When Yuki heard Kōki Hiruzen Sarutobi say this, he was speechless, never expecting that his confidence would be proven wrong.
However, the initiative was ultimately in Hiruzen Sarutobi's hands. It can only be said that Hiruzen Sarutobi is indeed a cunning old fox; he knew he couldn't just give away benefits without working. This pie-in-the-sky gesture actually motivated Kōki.
After being Hiruzen Sarutobi, Kōki wanted to quickly obtain Tobirama Senju's records, so he immediately began his career in the Anbu.
Fortunately, after resting for two days, Kōki was also thinking about getting moving.
Following the address of the Anbu given to him by Hiruzen Sarutobi, he arrived at a secluded place.
Upon arriving at this place, Kōki felt the gazes of those watching him from all directions. However, he did not panic. He simply took out the letter of appointment that Hiruzen Sarutobi had given him and held it up to show the surroundings.
A moment later, an Anbu Ninja darted out from the nearby woods and approached Kōki. After glancing at the appointment letter in Kōki's hand, he made a strange gesture towards the surroundings before saying to Kōki, "Come with me."
After the Anbu Ninja made the hand gesture, Kōki felt the sense of being watched disappear, realizing that he had passed the inspection.
Kōki followed the Anbu Ninja in front of him to the Anbu's location. Looking at the Anbu base in front of him, he found it well-organized and brightly lit, not as dark as he had imagined.
He thought about it and realized it made sense. It wasn't some shady organization like Root; the Anbu was actually highly respected within Konoha. Many Konoha Ninja considered it an honor to join the Anbu.
As they walked, the Anbu leading the way stopped. They had arrived at the location of the Anbu chief. The ANBU member knelt on one knee before the Masked Man seated at the head of the table and said, "Sir, Kōki Itō has arrived."
The man sitting in the head seat waved his hand after seeing the Anbu take Kōki away, and the Anbu who was kneeling on one knee disappeared.
At this moment, Kōki looked up at the Anbu referred to as "the adult," with some curiosity.
Then suddenly the Anbu spoke up, "Alright, Kōki, it's me."
The voice of the Anbu Captain sounded somewhat familiar to Kōki, but he couldn't quite place it. Had he heard it somewhere before? Kōki couldn't help but doubt his memory.
"I am Shinnosuke Sarutobi."
Seeing Kōki's slightly confused look, the head of the Anbu, oh no, Shinnosuke Sarutobi, was somewhat amused and exasperated. They'd met at his own house, after all; was he really that hard to remember?
Upon hearing this, Kōki finally remembered who the person in front of him was. Wasn't this Konohamaru Sarutobi's nameless father from the original story? Well, now he should be called Shinnosuke Sarutobi.
Kōki had met Shinnosuke Sarutobi before when he was a guest at Hiruzen Sarutobi's house, but his impression of Shinnosuke Sarutobi wasn't as strong as his impression of Asuma Sarutobi. After all, it's hard for him to remember a character who doesn't appear in the original work.
"It's Shinnosuke- nii! Who did I think it was?" Kōki to see an acquaintance in the Anbu.
At the same time, he thought to himself, "I didn't expect that Old Man Sarutobi, who looks so upright and righteous, would actually arrange a good position for his son in secret."
Becoming the captain of the Anbu (Anti- Anbu Captain) isn't easy; it requires connections. Of course, one's own abilities must also be sufficient to become the captain. Even a weakling who tries to become the captain of the Anbu through connections with Hiruzen Sarutobi will be impeached.
" Kōki, Father has already told me about your plans. I intend to have you join the Butterfly Squad. The Butterfly Squad is a tactical team composed of the elite members of our Konoha Ino-Shika-Cho Clans. With your offensive capabilities, you'd be a perfect complement to them."
Shinnosuke Sarutobi already knew from his father that Kōki strong and possessed Kōki Wood Release, so the team he paired with Kōki couldn't be too weak, otherwise they would easily hinder Kōki, and they could also protect Kōki in crucial moments.
"No problem, Shinnosuke- nii, you can arrange it as you see fit."
Kōki had no objection to Shinnosuke Sarutobi's suggestion. His only request was that he didn't want his teammates to be too weak, otherwise it would greatly affect his performance.
After receiving Kōki's permission, Shinnosuke Sarutobi said to the empty space behind Kōki, "Come in."
Shinnosuke Sarutobi had already planned for Kōki to join the Butterfly Squad, so he had the squad members wait outside beforehand.
Having heard Shinnosuke Sarutobi's message, the Butterfly Squad, who had been waiting outside for a long time, appeared in front of Kōki.
Looking at the three people in front of him, with their blond hair, pineapple-shaped heads, and plump figures, Kōki found them to fit his understanding of the Ino-Shika-Cho Clans.
" Butterfly Squad, introduce yourselves." Shinnosuke Sarutobi asked the three to introduce themselves to Kōki.
"Yes, sir. I am Nara Yūsuke, a member of the Nara clan, and the commander of the Butterfly Squad. I am skilled in Shadow Secret Techniques. To my right is Yamanaka Kenji, a member of the Yamanaka clan, the main defender of the Butterfly Squad. He is skilled in Mind Secret Techniques. Akimichi Tsuyoshi is a member of the Akimichi clan, the main attacker of the Butterfly Squad. He is skilled in Akimichi Secret Techniques." The pineapple-headed man standing in the middle of the three introduced himself and the two men on his left and right.
Seeing that Nara Yūsuke could clearly explain the characteristics and roles of his team members and individuals, Kōki sighed in admiration, "As expected of the Nara Clan, known as the intellectual pinnacle of the Shinobi World and the strategist of Konoha."