One hundred turns after the process of researching the seal had started, Kazuo achieved another breakthrough.
It only happened after he was able to achieve a survivability of twenty minutes without his heart in his body.
The seal which had been on his heart had started vanishing, the organ was no longer being supplied with chakra as it was no longer connected to his body, and the seal seemed to have been created with the intention of using the bodies own chakra to sustain it, this finally gave Kazuo the perfect idea on how to remove the seal, It wouldnt be easier than simply researching the entire seal and breaking it, but it was a more direct approach.
If he managed to survive long enough and his medical ninjutsu reached a high enough level then he would be able to take the heart out, completely intact, wait until the seal broke on its own from a lack of a chakra source and then grab the organ and transfer it back inside his own chest, before usign medical ninjutsu to connect all the vessels and nerves once more and restarting it.
In a way he was doing a self transplant with his own heart, the main difficulty in completing the tast in this way was simple. He had to somehow live around ten more minutes, so around an entire half an hour with his heart outside his body aswell as learn how to reconnect the nerves.
The nerves were even smaller than the vessels in his body, and he was already having slight difficulties when pumping his blood, having multiple times died ahead of his plan because he had released chakra too forcefully and ended up erupting said blood vessels.
'It's doable, though the time needed for me to increase my chakra control to such a level aswell as increase my medical ninjutsu proficency even more… a houndred, no perhaps two hundred turns wouldnt even be enough.' Kazuo thought to himself, his lips falling into a thin line of contemplation as he sat down on the floor, having not restarted to process instantly during this turn.
'I dont particularly need to study medical ninjutsu as a whole, I dont need to know how to heal any type of wound, I simply need how to do this one specific task, overall my medical ninjutsu hasn't recieved even a single increase in rank in the system interface, however I still am much more proficient, thats because I've simply learned a single thing in the miard of things that are required to become a medical ninja or master medical ninjutsu.' Kazuo thought to himself before releasing a soft sigh as he lifted his hand to run it through his own hair.
Looking down at his body, he gazed at his hands, for the first time in a while, Kazuo simply looked at the body that now felt entirely his own. Back when he had first come into this world, it had been strange, like he was wearing a uniform that didn't quite fit him. Now that strangeness had completely faded and the body itself was completely different from the almost scrawny pubescent boy it had been.
Muscles covered his entire body, scars could be seen on various parts of his body from different fights he had been in whilst doing missions.
'I used to train in the gym back in the old world aswell… wanted to be like Toji Zenin… heh, I kinda do look like him, now that I think about it…. Man… why did I have to be reborn in Naruto, couldn't it have been… nevermind… thank god its Naruto and not some other shit like Attack on titan or god forbid Berserk.' Kazuo thought inwardly as he released a soft chuckle before calming his thoughts back down once more and restarting the process.
Kazuo himself didn't notice it, he had already been in what could only be called as secular training for years now. His mind had slowly started to change, his emotions about the very world had changed, his previous insanity had almost completely faded.
It was a surprising development, most others would have gone insane from the lack of human connection, Humans afterall were social creatures, Kazuo however had done the opposite. His mind had calmed down even further, It wasn't as if he had regained his emotions, there was no real emotions besides greed and ego that really existed inside his own mind however the brief flashes of insane anger, insanity that bordered or even surpassed most mental asylum patients, that had faded almost entirely.
In a way, he had truly entered a similar if more permanent state of what meditators called the zen.
And he had done it whilst he was clawing his heart out and dying over and over for years on end.
No, perhaps he hadn't cured his insanity, he had simply grown even more insane to the point that he had started to return to a strange normality.
Lifting his hand once more, Kazuo clawed at his own chest and restarted the process once more.
*Shqlckkk*
The sound of flesh being torn was heard yet no blood spewed from his chest like it had before when it had appeared as if a geyser of it was being released from his body, this time there was none. There had been no blood for a while now, the medical chakra that covered his hand made sure that there was none.
Twenty six minutes passed and the turn ended.
Dozens of turns later, the twenty six minutes turned into Twenty six and a half minutes.
And then it was twenty seven minutes, Twenty eight Minutes, Twenty nine minutes, Twenty nine minutes and a half.
Before finally, the world did its final rewind, Kazuo was once more sitting in the same position.
He had already decided to stop counting after the 500th time loop.
He however knew with deep certainty, that this, this would be the final time he would be experiencing this day.
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