Chapter 154: The Birth of a Medical Ninjutsu That Surpasses the Yin Seal
The Ōtsutsuki clan planted a God Tree on this planet, absorbing the natural energy of the planet, converting it into chakra, and nurturing the God Tree Fruit. Kaguya ate the fruit and gave birth to two children, one of whom, the Sage of Six Paths, established Ninshū, attempting to use chakra to connect people and eliminate conflict and misunderstanding among humanity.
Unfortunately, he later failed. People took the initiative to sever the connection, injecting their own will into their chakra and turning it into a weapon for strife.
From this perspective, Makoto's "Cell Activation" and "Spiritual Fetus" abilities did indeed have a similar operating logic. But the difference in their power levels was immense. At their absolute limit, his two abilities were only at the Kage level. To go further, he would have to integrate senjutsu and Yin-Yang power just to touch the edge of Six Paths-level ability. To popularize Six Paths power would require a massive infusion of energy, a gap that could not be bridged by talent alone.
What was certain was that these two techniques had great potential for the future and might become the key to his further advancement.
Now, it all depended on whether his simulated self could develop the "Spiritual Fetus" technique.
[At a critical moment in your research, the Great Ninja War breaks out. Although you are not a ninja, your lover, Haruno Sakura, is participating in the war, and you naturally cannot sit by and do nothing.]
[During the war, you fully display your Flying Thunder God power. Although it is difficult to enter the core battlefield to assist Naruto and Sasuke, you play a huge role on the periphery and in logistics.]
[You assist in Orochimaru's revival and witness him summon the four Hokage. The four are also surprised by your existence. The First Hokage, after hearing from Orochimaru that you have inherited his will, laughs heartily.]
[You help Sasuke and Itachi subdue Yakushi Kabuto, causing the Reanimated Army to disappear earlier and reducing the casualties in the ninja world. You also save the fathers of Ino and Shikamaru, which finally earns you Yamanaka Inoichi's approval.]
[Finally, at the side of the four Hokage, you witness a Six Paths-level battle, from which you gain a certain understanding of the use of Yang Release chakra and the conversion of life force.]
[You even find the time to ask the First Hokage some questions, and he unreservedly tells you some application techniques for Cell Activation, Sage Mode, and Wood Style.]
Makoto was shocked again. You can even play it like that?! That's right! In Konoha, he was already the inheritor of the First Hokage's Will of Fire. How could the First Hokage be stingy with his new experiences? After the simulation ended, he would have to check these new experiences immediately. At the very least, with these, he wouldn't have to take any more detours.
[The Great Ninja War ends with the joint efforts of Naruto and Sasuke. The two of them are also heavily injured in their final battle at the Valley of the End. You, who have already made great strides in your research on Yang Release and life force, directly team up with Sakura and Tsunade to recreate their arms.]
[Even Guy's leg is healed by you, but his physical condition is much worse than before, and he can no longer fight using the power of the Gates above the Sixth. Guy is already very satisfied with this, and in the short term, there are no powerful enemies that require him to go all out.]
[At this point, your fame is completely established. With your Restorative Life Reincarnation Jutsu, your reputation in the field of medical ninjutsu even surpasses Tsunade's, and you become the God of Medical Ninjutsu of the new generation. In addition, with your hidden Flying Thunder God technique, many people guess that your strength is no less than that of the previous Hokage.]
[Regrettably, the publicly acknowledged strongest in the ninja world are Naruto and Sasuke. You have no intention of competing with them for the title of "strongest" and instead continue to focus on the research and development of ninjutsu.]
[Konoha 70: You get married. Your wives are Yamanaka Ino, Haruno Sakura, Hyūga Hinata, and Anko Mitarashi. The five-person wedding shocks the ninja world, but all the major powers come to congratulate you. No one dares to raise any objections.]
Seeing this, he was slightly taken aback. How did he end up marrying four at once? Hadn't he been focused on pursuing Sakura and researching ninjutsu? Alright, it seemed the foundation he had laid was too solid. Sakura, as the main target of this simulation, needed no further explanation. With his Flying Thunder God, it was impossible for him to let Ino's father die, and this probably constituted the key condition for her to marry him. As for Anko, she was a woman who had already changed her surname to his in her heart. And Hinata's personality determined that once she had set her sights on him, she would never change. She had probably been practicing to be a bride in private for many years.
Four is four. Marrying four beautiful women at once, what was there to be dissatisfied about? This also almost meant that in the future, he could try to have even more children at once.
He thought, pleased, obviously forgetting one thing.
[After getting married, you are in no hurry to have children. Instead, you tell your wives that you want to continue researching medical ninjutsu. The girls agree. Two years pass, and you still have made no progress in the direction of the Spiritual Fetus.]
[Because you helped with his revival, you and Orochimaru have maintained a correspondence. After learning of your research difficulties, he invites you to visit his laboratory. You are surprised to find that he has already cloned a boy to be his heir, and he even wants another one.]
[Orochimaru tells you that if you want to create a spiritual fetus, then you must observe a real fetus. You look at his clone son, but he just smiles and says that you should be getting your own wife pregnant, not looking at his son.]
[Inspired, you return to Konoha. That night, you take your four wives to soak in a hot spring together. They all think you are in a bad mood and use all their skills to comfort you. It is not until you throw away the "safety tools" Ino brought out that they realize you are prepared for everything.]
[You apply your medical ninjutsu and make all four of your wives pregnant on the same day. This matter is spread by a drunk Tsunade, and for a time, people come to you for treatment in an endless stream. You also slowly begin to increase the number of patients you see, experiencing the meaning of life from it.]
[In addition, you spend half a day every day having a 'chakra exchange' with your wives. In this way, you silently experience the conception and formation of life, recording in detail the birth and operational laws of their life force.]
[Nine months later, you finally have an epiphany and write down a complex curse mark. Then, using your own and the girls' spiritual energy as the seed and a sealing formula as the womb, you give birth to a living ninjutsu with spiritual fluctuations. You call this pure spiritual entity a 'True Spirit,' and name the entire ninjutsu system the 'True Spirit Seal.']
[The True Spirit Seal, as you predicted, can controllably and continuously convert one's own physical stamina into life force. This life force can be directly absorbed by the body, thus achieving the effect of nourishing the body and granting eternal youth, and it is estimated that one's lifespan can also be greatly extended. The accumulated life force can also be used to heal others; regenerating a lost limb is not out of the question.]
[The only problem is that the existence of the True Spirit is too weak, far weaker than a ninja's own spiritual will. This leads to a very low conversion efficiency; it might take a month of accumulation to cast a single jutsu. This can't be helped. Once the True Spirit becomes stronger, it will have its own will, and at that time, it will no longer be able to produce life force. This is a paradox that cannot be solved for the time being.]
Seeing this, the surprise on his face was unconcealed.
It really worked! A ninjutsu comparable to Cell Activation, and in terms of casting difficulty, even superior to Tsunade's Yin Seal, had been successfully researched by him!
Theoretically, this couldn't even be called a ninjutsu anymore. It wouldn't be much of a stretch to call it a semi-divine art that surpassed the limits of mortals. However, this technique was also quite dangerous from an ethical standpoint, as it mimicked the life force conversion process of a fetus and required the spiritual energy of both a man and a woman as a catalyst. If it gained some degree of will, it might really be born as a living entity, just like Black Zetsu and Kaguya Ōtsutsuki.
However, there were plenty of ninjutsu in the ninja world with similar risks. His was just a drop in the bucket. With the simulator, he didn't need large-scale human experiments. As long as he didn't say it himself, no one would know the principle of this technique. As for whether others could see through its secrets, that was even less of a concern. Even Tsunade's Yin Seal was a one-of-a-kind technique before she taught it to Sakura, let alone the True Spirit Seal, which was theoretically more difficult.
[One month later, your children are born.]
[You and Haruno Sakura and Anko Mitarashi have daughters. You and Yamanaka Ino and Hyūga Hinata have sons.]
[You name them Akiyama Ai, Akiyama Mochi, Yamanaka Shin, and Akiyama Teru, respectively.]
[Congratulations, you have completed the simulation. Calculating the bloodline power of your heirs.]
Seeing this, the smile on his face froze slightly. Hinata gave birth too?
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