The sky Ninja Fortress can use the Ark reactor to maintain floating for extended periods, and Kain can also use some alchemy methods to make the Sky Fortress lighter.
There are also resources in the ninja world. Many rare resources in the Marvel world are under control, while the ninja world has yet to exploit them fully. The most valuable resources in this undeveloped, feudal world are those rare resources.
Kain has calculated that within ten years, he will build the largest mining group in the ninja world, which will then feed back into Marvel or other worlds.
"Sister Tsunade, later today, we're going to Konoha Hospital to show you the power I've recently controlled."
Early in the morning, Kushina pulled Tsunade out of bed, then stopped Nawaki, who was also about to go out, and said confidently, "Nawaki, you come with us too!"
Hearing this, Nawaki shook his head and declined. "Kushina, I'm leaving the village soon for the front line. Maybe next time, wait until you're more proficient in controlling the power of the Tailed Beast…"
After Kushina was able to control the power of the Nine-Tails with seven tails last time, she went to Nawaki to learn from him, but she ended up being restrained by Wood Style and couldn't move.
"Don't say no, it will be fine soon."
Kushina wanted to show off the power she had just gained, so she insisted on bringing Nawaki along. Although she asked Tsunade to wash up and eat breakfast, the three of them headed to an unmanned training ground next to the Death Forest.
Tsunade and Nawaki thought this sparring session would be similar to the last one, but they were shocked by Kushina's strength.
Nine-Tails Chakra Mode—Nawaki may not have been very clear about this, but Tsunade knew exactly what it was. Grandma Mito could enter this state.
Nawaki was almost defeated by Kushina in one round. If he hadn't been trained by Orochimaru to be extremely vigilant, he would have been caught by her speed and diamond chain lock right away.
However, Nawaki reacted quickly. After taking a big loss, he counterattacked with Wood Style.
In the end, apart from using large Wood Style ninjutsu, Nawaki and Kushina fought for a long time before they were barely defeated. The final result was that they were tied up by Kushina with a diamond chain.
After the fight ended, Kushina looked smug. Although Nawaki didn't use his full strength, Kushina also didn't use the full speed of Nine-Tails Chakra Mode. She's not yet proficient in that kind of speed. If she used her fastest speed, she'd still risk injuring herself.
Kushina also has the ultimate Tailed Beast Bomb technique, though she hasn't fully learned it yet. She only heard a suggestion about it from Kain.
After the fight was over, Tsunade immediately stepped forward and asked, "Kushina, why did you suddenly enter that state? Didn't you only control seven tails last time?"
The progress is too fast, almost like a leap. The last time, Chakra—the tailed beast—was able to control the seven tails but still required potions. Tsunade was very puzzled.
According to common sense, it would take at least four or five years for Kushina to have the opportunity to enter this state.
"The boss helped me, otherwise I wouldn't have improved so fast," Kushina said with a smile. Kain didn't let her hide the Extremis virus thing because it was too obvious.
As long as she was injured, it would be exposed. Konoha had nothing to do with Kain now, and the relationship between Kushina and him was improving. Even if Sarutobi Hiruzen found out, there would be nothing he could do.
"You mean Kain-san? Kushina, don't tell me you also..."
Nawaki asked speculatively after hearing her words. He, being the beneficiary, could easily guess what Kushina was implying.
"That's right, it's the serum that helped Nawaki recover. The boss injected me with it. Sister Tsunade, I think I've gained the power of Wood Style now. At least the adamantine chain can slowly absorb Chakra from the Nine-Tails."
After Kushina finished speaking, she made a small wound on her arm. The wound didn't bleed, but glowed slightly red, and soon healed.
"It's really the Extremis virus serum. This guy is so generous!"
Tsunade clicked her tongue. After the research was successful, she and Orochimaru each received a vial. Tsunade had used it to help Nawaki.
This stuff is too expensive. Tsunade had wanted to buy a vial from Kain afterward, but he refused. It's really hard to put a price on it.
After Nawaki injected the serum, his strength had not yet reached the peak of a ninja, but he had already become well-known in the ninja world.
A single vial of serum can turn someone into a ninja god, so it should be precious. Tsunade couldn't help but feel envious of how easily Kushina had access to the Extremis virus serum. "This guy wouldn't..."
"Kushina, shouldn't you..."
Just as Tsunade was about to ask, she suddenly noticed that Nawaki was still standing aside. She quickly waved him away, signaling for the clueless brother to move aside, and then whispered in Kushina's ear.
"How is it possible? No, absolutely not!"
After hearing Tsunade's question, Kushina quickly blushed and shook her head to deny it. She did owe her boss a favor, but she had never experienced anything like that.
However, Kushina couldn't help but think now: if the boss really mentions this matter, she should either postpone it for a while or agree to him.
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