What should he teach Sakura Haruno? Mizuki had considered many options. Teaching according to the student's aptitude was always the best method.
Elemental ninjutsu was quickly discarded. Sakura's chakra nature leaned toward water and earth, but her chakra reserves were extremely low—insufficient to support these two highly demanding chakra natures. Thanks to the Breath-Sealing Art that Mizuki had taught her, this deficiency could be somewhat mitigated. However, hoping to close the gap with Sasuke Uchiha and Naruto Uzumaki just through conventional elemental techniques was unlikely unless she fully mastered chakra nature transformation and fused them into a Kekkei Genkai—Wood Release. Unfortunately, Wood Release has never appeared in this world through conventional means. As for the possibility of transplanting the genes of the First, forget about it. Conducting human trials on his own disciple would turn Mizuki into no better than Orochimaru.
Taijutsu was also excluded after consideration. It could serve as regular training, but achieving mastery remained extremely difficult. Even with her "super strength" shown in the original storyline, Sakura couldn't do much against Red Sand of the Desert. She had the power to defeat an opponent in one punch, yet she couldn't land a hit at all. In the end, only with help from Chiyo could she barely win. The truth was that her taijutsu skills simply weren't good enough. As Tsunade's disciple, she excelled in medical ninjutsu, but other skills were truly mediocre. Maybe Tsunade focused more on certain areas in her training, but it was more likely that Sakura simply lacked talent for taijutsu. Besides, Mizuki himself wasn't particularly skilled in taijutsu and had no profound techniques to offer—only basic training to strengthen her fundamentals.
Therefore, among conventional ninjutsu, Sakura's most promising path lay in genjutsu, complemented by barrier and sealing techniques. Her battle readiness wouldn't be lacking at all. Still, Mizuki felt some hesitation. Turning Sakura from an offensive-type medical ninja into a control-type genjutsu specialist would essentially waste her talents in medical techniques. Becoming a more well-rounded ninja without obvious weaknesses had always been Mizuki's advocated path. Especially for ordinary civilian ninja who lacked Kekkei Genkai or clan secret techniques as their advantage point, if they refused to accept mediocrity or wanted to avoid becoming niche specialists, then they had no choice but to pursue overall development.
[Medical ninjutsu… such a hassle. Without Tsunade's guidance, I'll have to rely on my own medical knowledge to develop healing techniques from scratch. Starting from zero would take too long—I'll need to find another way through Yang Techniques. So then, should I start researching Yin-Yang Release now?]
Teaching wasn't easy, but since he'd taken on a disciple, Mizuki was determined to do it right. At the same time, this process was also an opportunity to organize his own knowledge. Teaching helps the teacher as much as the student—it really does work out for both.
As for his current trump card—Artificial Sage Mode—Mizuki still needed to think carefully. He wasn't sure if Artificial Sage Mode would truly suit Sakura. Maybe he should wait until it was further improved before making any decisions.
If Sakura Haruno could master Sage Mode and become a tailed beast in human form, her fists might rival even her monstrous super-strength. With full control over natural energy, she might even outmatch the brute force of her super-strength.
Beyond that consideration, there was another issue Mizuki needed to think carefully about. Choosing him as her mentor instead of Tsunade meant losing access to one major trump card from the very beginning—the massive summoned beast from the Shikkotsu Forest — Katsuyu. No one in the ninja world had ever seen this enormous creature's full body or witnessed her complete abilities. Even with Tsunade and Sakura combining the chakra stored within their Yin Seals, they still couldn't fully summon Katsuyu's complete form.
Now, none of that applied to Sakura anymore. The massive healing effects, shared chakra supply, Space-Time Ninjutsu, and direct physical support provided by Katsuyu were gone. Was there anything that could compensate for such a loss? Relying on other summons? Even Mizuki had to admit that was a stretch. Although external forces should never be entirely depended upon, at least they helped avoid many troubles and allowed someone to survive through their most vulnerable growth stage.
...
On the first day, Mizuki didn't make too many changes. As for Sakura, Mizuki gave her the Shadow Clone Jutsu along with techniques for freely controlling chakra distribution. In Mizuki's eyes, Sakura possessed an outstanding mind, possibly capable of better utilizing this jutsu's specialty. Mizuki also wanted to see how far beyond her chakra limit Sakura could go using this technique. If she could withstand the shock of memories and experiences returning when the clones dispelled, perhaps a miracle could happen—a miracle Mizuki secretly hoped for.
Additionally, he taught her an advanced medical ninjutsu called [Minute Malady Extraction]. This wasn't some run-of-the-mill jutsu—it was a top-tier medical technique. Even Mizuki could barely use it himself. Difficulty aside, the real problem lay in finding suitable practice materials. A truly skilled medical ninja required more than just talent—real combat experience was essential. Only a shinobi village like Konoha, with its organized medical system, could train medics of this level. While having so many injured patients in hospitals posed a heavy burden, from another angle, weren't these patients exactly the kind of experience medical ninja needed to hone their skills?
Therefore, by choosing not to become Tsunade's disciple, Sakura naturally lost access to these resources, something no single individual like Mizuki could ever replicate what an entire village could offer. Despite this, Mizuki still needed to do his best—not just for Sakura, but because he himself desperately needed this technique.
[Minute Malady Extraction] was an extremely unique medical ninjutsu. Its B-rank status alone made clear just how difficult it was to master, though its learning difficulty was slightly lower than the Mystical Palm Technique or the Scalpel. Its main function involved precisely sensing a patient's afflicted areas and harmful substances within the body using fine chakra detection. Then, the user would cut open the infected spot and extract the damaging elements. This technique required highly refined chakra control from the user. Otherwise, instead of saving the patient, the medic would easily end up harming them. One major advantage of this technique was its great effectiveness in treating nearly all kinds of poison injuries—it was a rare, versatile medical technique effective against toxins.
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