After arriving at the orphanage and having lunch, Natsuo changed his clothes before continuing his Medical Ninjutsu practice on the bodies of several mice.
After several months of analyzing and storing information in his mind palace, Natsuo was ready to begin actively modifying the muscles of the mice.
Using a little Yang Chakra, Natsuo took control of the mouse's muscles and began to modify it little by little.
Almost imperceptibly, the mouse's muscles began to grow.
If you don't have the Sharingan or the Byakugan, it was impossible to see the change with the naked eye.
Natsuo viewed everything through his interface, pleased to see no damage to the mouse's body.
Natsuo stopped and took the mouse out of the cage.
After waking the mouse up with a little chakra, he quickly placed a Genjutsu on it and controlled its actions.
With the mouse under the control of the Genjutsu, he placed it on the floor and ordered it to walk around the room.
After walking to the wall and back, Natsuo picked him up and checked his body.
Seeing that there was no damage and after making another observation, Natsuo placed him back on the floor and ordered him to walk around the room again.
This time, the mouse wandered around the room for 10 minutes before Natsuo ordered it to return so he could check his body.
Seeing that the mouse's body was still fine, Natsuo smiled and placed it back on the ground to continue his tests.
But this time, he ordered the mouse to run.
Upon receiving the order, the mouse ran towards the other wall in front of him, and the entire run was recorded by Natsuo on his interface.
After reaching the wall, the mouse continued running around the room and Natsuo kept an eye on the time.
'A 5% increase,' Natsuo thought.
Yesterday I tested the capabilities of each mouse and this mouse achieved a 5% increase in its speed compared to yesterday.
After running for a few minutes, the mouse slowed down and all the data was recorded by Natsuo.
After seeing the tired mouse, Natsuo ordered it to return and analyzed its body.
Seeing that there was nothing wrong, he placed him back on the testing table before rendering him unconscious again and turning off his pain receptors.
With the rare creature motionless and unconscious, Natsuo used Yang chakra again to control his muscles and return them to their previous state.
With the procedure completed and checking that everything was in order, he woke the mouse and fed it before placing them in another cage.
But before placing it in the cage, Natsuo knocked it unconscious again so the mouse could rest. He needed the mouse to rest so he could check its condition later.
After experimenting with the first mouse, Natsuo took a second mouse and repeated the same procedure. And after placing it back unconscious in its cage, Natsuo took a third mouse.
In total, Natsuo performed the same experiment on 10 mice before stopping and returning to the cage where the first mouse lay unconscious.
Placing a Genjutsu to control the mouse, Natsuo ordered it to walk and run around the room to recheck its abilities.
And seeing the data on his interface, Natsuo smiled with satisfaction, seeing that nothing had changed compared to yesterday.
This meant that Natsuo could modify the muscles of these mice to temporarily increase their physical capabilities without negative consequences.
Natsuo tested the abilities of the other mice and smiled with satisfaction when he saw that none of them showed any changes in their abilities.
After putting all the mice back in their cages, Natsuo tidied and cleaned everything before leaving the room to take a shower.
Having spent the entire afternoon on his experiments, it was time for dinner.
Tomorrow he had to spend almost the entire day at the clan hospital, so he was happy to have successfully completed the beginning of his experiments to control the muscles.
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Time passed and Natsuo spent most of his time between the clan hospital and his experiments on the bodies of mice.
After a few months, Natsuo was able to increase a mouse's physical capabilities by 45% without negative consequences, and by up to 50%, damaging the mouse's body and requiring several weeks of recovery. Beyond that, the mice's bodies retained wounds that Natsuo could not heal with his current abilities.
After experimenting with muscles, Natsuo spent the rest of the year experimenting with tendons in conjunction with muscles.
Nothing changed in Natsuo's daily life; he continued experimenting with mice and traveling between the orphanage and the clan hospital. Occasionally, he visited the academy to take exams and prove he hadn't neglected his studies.
Although he perfectly demonstrated that he could perform the 3 jutsus of the academy, a ninja needed different knowledge to do his job well.
In addition to handling traps and manipulating explosive seals, a ninja needed knowledge of history and geography to carry out different missions.
Since Natsuo passed his exams perfectly, nobody said anything to him.
Although there was knowledge that the academy updated every year about different countries and that was not found in the books, the teachers thought that Natsuo obtained this knowledge from his clan.
Of course, this was not true.
Natsuo was able to gain this knowledge during the few times he visited the academy.
In what way could you ask yourself?
It turns out that Natsuo had had some success with his mental abilities.
Natsuo never stopped his Yin chakra control practices.
Whether through the manipulation of their own minds or the minds of animals.
And after being absolutely sure, Natsuo slowly began to connect his mind with the minds of the children around him.
Of course, the mind was not an open book from which one could obtain information simply by reading a page.
At first, he only got fleeting thoughts and just a few words.
But as time passed and his ability increased, Natsuo reached a point where he could read people's thoughts if they were next to him and had no protection in their minds.
In this way, he was able to find out what they learned when they were paying attention in class and when they were taking an exam.
Of course, Natsuo was able to accomplish that with his classmates by sitting at the back of the classroom out of the teacher's sight.
Would a ninja dare to use it?
Of course not. He'd realize it quickly.
Besides ninjas, he avoided children from the academy of clans that used Yin chakra, such as the Yamanaka, Kurama, and Uchiha clans.
What about the others?
They were a free pass for Natsuo, and he stopped worrying about morality when he discovered the thoughts of a child from the Sarutobi clan.
At first, Natsuo was torn between his morality and his chances of survival upon learning if someone was conspiring against him.
But when he read the thoughts of this child from the Sarutobi clan, he discovered that he was too innocent.
In a world like this, being weak and not taking advantage of the opportunities you found would lead to your early death.
From the mind of this child of the Sarutobi clan, Natsuo learned that he had been ordered to discover if the children of the Uchiha clan had awakened the Sharingan.
At first he hadn't noticed because he didn't attend the academy very often, but from the mind of the Sarutobi clan child, Natsuo knew that the Taijutsu teacher intentionally pitted the fastest children against the Uchiha clan children.
In that way, the children of the Uchiha clan could not hide their Sharingan or they would lose, and losing was not something that their pride as Uchiha allowed them to do.
Of course, his plans were unnecessary because only one of the Uchiha children had awakened the Sharingan so far and openly displayed it at his first opportunity, and based on what he saw of the other Uchiha children, they would do the same.
In any case, with this Natsuo knew that the village always paid attention to the geniuses of the Uchiha clan, and Natsuo did not believe that they had good intentions.
Although they wouldn't risk an open attack within the village, the Uchiha would one day leave the village and nothing would stop them out there.
Not to mention Danzo, who had an obsession with the Sharingan.
Furthermore, Natsuo knew that in a few years the Second Ninja World War would begin and no one would make such a fuss if some ninjas disappeared.
Knowing and confirming that the village's top leadership was watching the Uchiha, Natsuo was once again convinced to keep a low profile and continued with his life.
Sitting in the academy classroom as the teacher continued the lesson, Natsuo thought about the Sharingan and his plans to awaken it.
The little he knew was that it was necessary for a member of the Uchiha clan to experience hatred or pain to awaken the Sharingan, but since he wasn't a masochist, he had already thought of a method to awaken his Sharingan without having to go through a traumatic experience.