To be precise, this wasn't a ninjutsu or a secret technique, but rather an ability of the Second Hokage, Senju Tobirama.
"Hmm?"
Kanda Kyoichi extended his chakra, quickly sensing a figure hidden in the shadows nearby. From their position, they had a clear view of his courtyard, even parts of the interior of the house.
An Anbu?
Kyoichi didn’t turn around. He knew the person was likely watching him right now.
When he extended his senses further, he detected another Anbu in a different part of his house. But beyond that, there were no more.
Two Anbu!
Kyoichi retracted his chakra, thinking for a moment. He understood what was going on.
He had previously been a Chunin, and how strong he was had likely been assessed by those above him. After his injuries, he had made substantial improvements, and his physical condition had also strengthened.
The Third Hokage must have suspected something.
This surveillance was partly precautionary and partly to confirm the situation.
The two Anbu must have been tailing him since yesterday.
"Senju bloodline..."
Kyoichi pondered for a while, narrowing his eyes. He didn’t say anything, pretending not to notice the presence of the Anbu around his home.
But…
He was thinking not just about the Third Hokage.
But also about Danzo.
Most of the shady dealings in Konoha were connected to him, with at least nine out of ten schemes bearing his name—there was no injustice there.
That's why Danzo had been called the "Shadow Hokage."
Previously, Kyoichi had felt some sympathy for him, a man who had spent his life taking the blame for the Third Hokage. But now, living in Konoha, he had to consider the effects of Danzo’s influence.
That old bastard must have been secretly researching the cells of Hashirama in recent years.
Until now, the true Senju bloodline in Konoha had been almost extinct, with only Tsunade remaining, a powerful figure of great prestige, and Danzo dared not touch her.
However…
Kyoichi was different.
The Kanda family only had him left, a mere Chunin. If something were to happen in secret, no one would dare speak up.
The more Kyoichi thought about it, the more he felt a sense of impending danger.
Konoha was now under the control of the Third Hokage and Danzo, and it was impossible to predict what these two scheming old men might do.
Luckily, he had gained the ability to sense chakra.
With this technique, he could at least anticipate their movements in advance.
"Actually, if I could get my hands on the cells of Hashirama, it would be quite beneficial for me, but dealing with Danzo... it’s like making a deal with the devil."
---
"Today's class is over, and many of you still haven't mastered the Three Basic Technique."
"You'll need to continue practicing when you go back."
Another day of lessons had ended.
Kyoichi was feeling a bit exhausted.
There were some geniuses in the class, but still many students had poor chakra control.

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I, Konoha's Sage of Life
FanfictionKanda Kyoichi transmigrated to Konoha and became a temporary instructor at the Ninja Academy. Fortunately, he awakened the Mentor System. By teaching others, he could earn rewards. Thus began Kyoichi's career as a "teacher" in the ninja world. Shisu...