Yumi's Wood Release was so powerful that she couldn't control it in the short term. This was understandable since she hadn't received enough ninja training and had little concept of ninjutsu. Mastering a bloodline limit like Wood Release directly was indeed challenging.
However, Aoba felt a bit envious privately. Although he claimed not to care about Wood Release, he was referring to the kind used by Yamato, the green-thumbed Wood Release.
Looking at Yumi's unintentional results, which were comparable to Yamato's, he couldn't help but feel that with some development, Yumi's abilities could rival those of the First Hokage. The idea of having such Wood Release was irresistible to him, but unfortunately, he wasn't destined for it.
The laboratory was gone, and rebuilding it in the short term seemed unlikely. Despite its small size, the equipment inside was top-notch, provided by Orochimaru.
If he were to buy similar equipment from the market, it would cost at least 200 to 300 million ryo. Aoba's total assets were under 10 million ryo. His ninja tools store had recently seen some improvement, but rebuilding the lab with it would take at least two or three years.
Thus, he had to shelve the idea of rebuilding the laboratory temporarily and focus his limited energy on Yumi and Karin.
Since Karin woke up from her coma, she had changed little. Her chakra amount had increased again, but she could no longer actively use the Adamantine Sealing Chains.
Kakashi and Aoba spent considerable time researching this but ultimately found no solution. They could only infer that Karin was too young to bear the burden of using the Adamantine Sealing Chains, which might have triggered a self-protective instinct to limit her use of the power.
With this experience, once Karin grew up a bit, she should be able to use the Adamantine Sealing Chains naturally.
As for Yumi...
With such powerful Wood Release, Yumi naturally needed to master this power quickly. However, it was somewhat difficult.
Due to the uniqueness of Wood Release and Yumi's weak control, finding a suitable training ground within Konoha was challenging. The woods and riverbanks within Konoha's barrier were under the Third Hokage's observation through his telescope technique. He couldn't risk having Yumi train under their watchful eyes.
If they went outside, it would require registration. It wasn't impossible, but frequent occurrences would attract attention.
After some discussion, Kakashi finally made a suggestion.
"Actually, I think your previous suggestion of medical ninjutsu is excellent. It's one of the few techniques in Konoha that can be learned as long as one wants to. The simplest medical ninjutsu requires a high level of chakra control.
Having Yumi learn medical ninjutsu would help her train her chakra control. Over time, she will adapt to her power."
"Currently, there seems to be no better option. Wood Release, especially at this level, would cause big trouble if discovered by Konoha."
Aoba hadn't considered destroying Konoha and wasn't planning to defect for the time being. He still had things to do here, so it was better to be cautious.
However, medical ninjutsu alone couldn't fully utilize Yumi's new body.
The body Yumi received from the fusion was many times stronger than his results.
To put it simply, he had a body close to that of an elite Uzumaki clan ninja, with chakra amount and physical strength comparable to the top ninja bodies in the world.
Yumi's body, on the other hand, was on par with Hashirama Senju. Hashirama's cells had rapidly proliferated, covering most of Yumi's cells.
In the end, Yumi had relied on her mental strength and will to control this power. Even though the proliferated cells might not match the original Hashirama cells, he speculated that if Yumi fully released her current body's power, it could reach 50 to 70 percent of the original Hashirama Senju's level.
Not exaggerating, 70 percent of Hashirama Senju could nearly flatten the current ninja world, and could even confront Pain with his Rinnegan head-on if Madara Uchiha didn't revive.
However, training Yumi to reach that level would require a lot of time.
The primary goal at this stage was for her to initially master her Wood Release.
Meanwhile, Aoba started basic ninja training with her, such as tree-climbing, water-walking, and physical skills. However, he was hesitant to let Yumi learn ninjutsu until she had a firm grasp on her Wood Release.
He was mainly worried that she might accidentally trigger a Wood Release phenomenon that could flood Konoha.
Once Yumi could initially control her power, they would start advanced training and teach her the original Wood Release techniques of the First Hokage.
However, there was a small problem: neither he nor Kakashi knew the Wood Release techniques.
"The Book of Seals in Konoha should contain all Wood Release techniques. You can exchange them with points."
"That option is out of the question. It's too conspicuous. As soon as we choose it, it will definitely attract attention. Hiruzen still has some dignity, but if Danzo finds out, I'd have to kill him."
"...I was just about to say, Danzo also has Wood Release data. But you're right; that person isn't trustworthy."
"We'll discuss this problem later. If it really comes to it, I'll trade with Orochimaru."
Aoba's choice puzzled Kakashi. He found it strange that Aoba prioritized Orochimaru over Danzo, considering Orochimaru was the defector and fugitive.
"Well, how should I put it. Orochimaru is a dangerous guy, extremely dangerous. But he's also very straightforward. He has his own pursuits and is willing to pay the price for them. So, trading with him is satisfactory as long as you ensure you have something to offer.
But Danzo is different. He's the type who wants everything but doesn't want to pay anything. The best way to deal with him is to kill him when he shows his cards and take his chips because he would do the same."
"Alright, I can't help with this issue." Kakashi said he was powerless and left it to Aoba.
At this moment, Aoba thought of something. He had been promoted to Jonin for over a year and had done many missions, accumulating a lot of points.
Theoretically, these points could be exchanged for techniques with Konoha's higher-ups. However, he had never used them.
"Kakashi, can the Fourth Hokage's Flying Thunder God technique be exchanged with points?"
"..."
Kakashi looked at Aoba with a strange expression.
"You want to learn Flying Thunder God?"
"Yes."
"In that case, you don't need to exchange for it. I'll handle it."
"You can?" Aoba was skeptical, wondering when Kakashi learned Flying Thunder God.
"Well, I don't know Flying Thunder God, but I do know the training method. After all, the Fourth Hokage was once my teacher."
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Currently on Chapter 90 - Konoha's Crush: Their Respective Missions