"I'll do it, Sensei," Kaida said, while his thoughts were, 'I've invested too much time in this to back off now just because of some temporary pain. I can surely bear this much pain,' not knowing how wrong these thoughts were.
"Very good, then let's start," Mitsuru said, standing up from her chair.
"Now? Don't we need to prepare before that?" Kaida asked.
"I am all the preparation you will need. Heal yourself, and I will make the healing seal for you. There is nothing to prepare for," Mitsuru said.
"Then at least give me some time to mentally prepare myself, Sensei," Kaida said, backing away a little.
"The more you think about it, the more difficult it will seem," Mitsuru said, laughing mischievously. She was having a good time seeing Kaida scared like that, acting like a child for the first time.
"But…" Before Kaida could say anything else, Mitsuru was standing right in front of him.
"No buts. Either you want to learn it, or you don't. There is no middle ground here," Mitsuru said.
"Okay, Sensei, let's start," Kaida sighed. There was nothing he could do anyway.
"Very well, let's go," Mitsuru said, and they went to the room where the bandit was initially placed.
...
Kaida was lying on a stretcher, with Mitsuru standing in front of him, instructing him on what to do.
"We will first start with the easy part: skin and muscles. I will make some cuts and bruises on various parts of your body. Heal them normally so that I can create an all-purpose seal for every type of injury."
Kaida just nodded his head. He had suffered many types of injuries, and there was nothing he could do except pray that it wouldn't hurt as much as he was thinking.
The reason Kaida had to endure various injuries was because the treatment changes slightly for each type. If you have a cut, the treatment is to bring the two parts close together and heal them so they join. But if you get shredded by a mace or a powerful punch, the treatment is completely different.
Mitsuru took a scalpel and made a small cut on Kaida's hand. It was a simple cut, and Kaida didn't even feel it. He simply passed his yang chakra through the area, and the wound healed at a speed visible to the naked eye.
"Too slow, brat. You have to use medical jutsu, not normal chakra. The speed should be instantaneous," Mitsuru said.
Kaida nodded as he received another cut. This time, he used something similar to the Healing Palm Jutsu but with normal chakra. The speed of healing increased by 2.5 times.
"Still slow. Do it one more time," Mitsuru said, once again making a small wound on Kaida's hand.
"Sensei, you're not enjoying this, right?" Kaida asked, because this time the wound healed within a second.
"If you have time to think about these weird things, why not use that time to heal yourself?" Mitsuru said, fully focused on the cut.
Having no other choice, Kaida did the same thing again, just with more chakra and speed. He was sure this time it healed within a second.
"This much is acceptable. Now do it one more time," Mitsuru said, creating another wound on Kaida's hand. She took out a brush, white and blue in color, and for some reason, Kaida thought of Lady Katsuyu (the slug).
But he had other things to focus on. Once again, he healed the cut on his hand in record time. Mitsuru passed her chakra through his body and started making a seal on his hand. Without saying anything else, she used a senbon and inserted it into Kaida's hand.
The senbon contained a small amount of paralyzing poison as well. Kaida simply focused on healing himself as fast as he could. It took him 2 seconds to remove the poison from his hand and heal the wound, but Mitsuru was not satisfied with that.
So after 3 more tries, Kaida managed to do it in 1 second. Mitsuru then continued the seal she was making. From the procedure, Kaida was praying that the next step wouldn't be what he was thinking, but reality doesn't work on prayers.
Mitsuru picked up a small hammer.
Smack
A small chunk of flesh was removed from Kaida's biceps. It was a very common type of injury that medical ninja had to heal, so there was no way they would ignore this. But this one was different from normal injuries.
The others didn't hurt as much. Kaida was drenched in sweat because of the pain.
"Focus, Kaida. Otherwise, we would have to do it a second time," Mitsuru said, completely serious. Motivated like hell, Kaida began using medical jutsu to heal the wound. To Mitsuru's surprise, the wound healed in 1 second. She was expecting 2-3 seconds, but Kaida simply used the Sharingan and its precise chakra.
'I am a fool. Why was I not using this from the start?' Kaida thought as he used the Sharingan to increase his chakra control and divide the chakra into yin and yang as fast as he could. With his 3-tomoe Sharingan activated, his speed was three times the normal.
Now she used an electric discharge and burned his hand. The pain was so sudden that his hand jolted away, only remaining in place because of the straps Mitsuru had placed at the start.
"At least warn me before doing something like this!"
"Sorry, I forgot you're such a delicate princess. Now heal yourself." Since there was nothing to say, Kaida just focused on healing his hand.
"This speed is good. Keep this up," Mitsuru said and completed the healing seal for his hand, then moved toward the other hand.
"We have to do this for every other part of the body too?" Kaida asked.
"Yes, now focus," Mitsuru said and once again made a cut on Kaida's other hand. But this time, Kaida healed himself very swiftly, and there was no need to redo everything like before.
Afterward, his legs and torso were also covered in healing seals, and finally, his face too.
"Having a Sharingan is such a cheat. I had to suffer so much for this when Tsunade-sama was 'helping' me," Mitsuru said, then shook her head.
"I was planning on only doing skin and muscles for today, but it got completed quite early. What do you say? Should we continue with bones too?" Mitsuru asked, seeing that it had only been 2 hours.
Kaida, though desperately wanting to say no, said, "Okay, Sensei." The anticipation of how difficult this would be was hard to bear the longer he waited.
"So, I will need to break 10 major bones in your body and make a seal that will target the bones in the area near those 10 major bones. Once completed, you should be able to heal your broken bones by just passing chakra to those seals," Mitsuru explained.
Kaida just nodded his head, wanting to get this procedure over with. If he had known about this before he started preparing to learn this jutsu, he would have surely left the idea of learning it in a dustbin or something.
Just like Mitsuru had said, she opened various parts of Kaida and broke some of his bones. Kaida had to heal the bones and not the skin so that Mitsuru could apply the seal. Though difficult, it was doable with some concentration and the help of the Sharingan.
After 2 more hours, the process ended. Kaida was fully covered in sweat, his body aching so much that it was difficult to describe. Even though he had healed himself, a fraction of pain remained, like phantom pain.
"Take a rest tomorrow and also discuss the money-related problem with your parents. We will complete this the day after tomorrow, and then I will call those grandmasters to help you," Mitsuru said.
"Yes, Sensei," Kaida said, limping out of the room.
"Make a shadow clone and go back using that. Also, stop behaving like a patient; you are perfectly fine," Mitsuru said, shaking her head. She had checked twice to see if there was any minor injury left behind that they had missed, but there was no such thing. Kaida was perfectly healthy. It was just that his brain had processed so much pain recently that he felt like he was not well.
Kaida just nodded his head and made a shadow clone to go back home.