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During the time Yoichi stayed by Tsunade's side, he also took care of Nawaki.
However, his main focus was on Tsunade. Nawaki's strength was too weak; he just needed to train systematically to improve.
Tsunade still had a lot of potential for growth, and she was already a powerful ninja.
By learning Haki (both Armament and Observation), mastering Sage Mode, and grafting Wood Release to increase her chakra reserves and recovery, Tsunade was reaching the pinnacle of what a ninja could achieve.
At that point, she would possess vast chakra reserves, a body so tough that it was nearly impossible to injure, the strength to shatter half a mountain with one punch, and the ability to sense an enemy's every move during combat.
Apart from her slightly slower speed, she would be virtually flawless.
As for Genetic Potential, it was a technique that allowed a ninja to surpass Six Paths' strength without relying on tailed beasts. An entry-level planetary rank was roughly equivalent to a normal state with seven gates open.
At the high-end planetary rank, it was like a single punch equaled a Tailed Beast Bomb, capable of destroying continents, and granting a near-thousand-year lifespan. (TL: It got nuts...)
Yoichi had enough time. Now, he was training Haki with Tsunade. He had only recently acquired Haki, having trained just a few days more than Tsunade, and was not yet able to achieve Haki infusion.
Tsunade initially wanted to teach Yoichi her superhuman strength technique, feeling uncomfortable accepting so much help from this young pervert without giving something back.
However, Yoichi refused and told Tsunade that when she returned to Konoha, he would teach her a new technique for exerting force.
When he acquired the [Disciple of All Worlds] ability, Yoichi brought back the Extinction Gun technique, which had a maximum force output of six to seven times. However, Yoichi had not yet trained in it as he wanted to first enhance his Genetic Potential.
If he fully devoted himself to training, Yoichi's progress would be swift. However, that would mean neglecting his family and many other matters, which he did not want to do.
His initial purpose for coming to the Ninja World was immortality, which he had basically achieved. Now, he wanted to enjoy life.
However, Tsunade felt that Yoichi rejecting her superhuman strength technique was him looking down on her ninjutsu, and she insisted on teaching him a lesson as a senior. But before their duel, she stipulated that they could only use taijutsu, not Sharingan techniques.
For several days, the civilians of the nearby town in the Land of Tea could hear thunderous roars in the distance, accompanied by occasional earthquakes.
After enduring this for some time, the townspeople finally couldn't take it anymore. They held a celebration, praying to the gods for the continuous earthquakes to stop.
To their relief, the celebration seemed effective, and the earthquakes ceased. The townspeople decided to keep this annual celebration, praying for divine protection.
During this month, both Tsunade and Yoichi made significant progress.
Tsunade, with her finely controlled chakra, quickly grasped the principles of Armament Haki and began to use it, covering her hands. After over a month, she could almost cover her entire body with Armament Haki, catching up to Yoichi. The next step was to make her Haki even tougher and eventually achieve Haki infusion.
At that point, Tsunade could even try punching away a Tailed Beast Bomb without getting hurt.
As for Yoichi, his defense became even more terrifying. Even without any protection, bullets, shuriken, and kunai couldn't pierce his skin. With the Lightning Armor and Armament Haki, no ordinary ninjutsu could break his defense.
Observation Haki was also not difficult for the two. Tsunade already knew some sensory ninjutsu, and it was just a matter of using another method to make it constant and more precise. This required fine chakra control, which both Tsunade and Yoichi excelled at.
They didn't learn many ninjutsu techniques because they wouldn't use them often, maybe once in a decade, and mainly for teaching students.
Observation Haki was very useful for detecting enemies and aiding in combat, so Tsunade started learning it from scratch like a new ninja technique.
During their training, Tsunade and Yoichi used shadow clones to teach Shizune and Nawaki. Tsunade even entrusted Nawaki to Yoichi, blushing when she mentioned it.
Nawaki called Yoichi "brother-in-law," and Tsunade only lightly reprimanded him, not opposing the title.
Training together, discussing ninjutsu, and spending evenings soaking in hot springs and drinking together, Tsunade grew to enjoy this life more and more.
Her long-lost brother was alive again, jumping around in front of her, still talking about his childhood dreams. Even after she disciplined him to focus on training, he never gave up on becoming Hokage.
With a considerate person by her side, even though he sometimes made her furious with embarrassment, Yoichi always managed to cheer her up, making her feel cherished.
Before, Tsunade felt she was losing something in her life. Now, it felt like everything she had lost had returned.
One day, after training, all four had made considerable progress.
Tsunade could now use both Armament Haki and her superhuman strength simultaneously, and her combat proficiency with Observation Haki had increased, making it harder for Yoichi to spar with her using only taijutsu.
Nawaki had mastered the Six Styles and, once his body was further enhanced with Wood Release, he could start training in Haki.
The improved Six Styles required less physical strength and more chakra control, similar to Haki.
Shizune had learned the A-rank medical ninjutsu, Mystical Palm Technique. All four had made significant gains, and Tsunade suggested they celebrate with a drink.
During this month, Yoichi also discussed the difficulties of training Genetic Potential and shared the initial data on the Extremis Virus with Tsunade.
While Tsunade was interested, she knew she couldn't conduct research in the Land of Tea and would have to wait until they returned to Konoha.
Without human experimentation, it was impossible to make progress with just theoretical data.
After drinking, they all soaked in the hot springs before returning to the inn. Tsunade suggested gambling, but Shizune and Nawaki firmly rejected the idea.
Nawaki, although not remembering his grandfather Hashirama, disliked Tsunade's gambling habits, especially when she lost and took it out on him.
"Damn Nawaki, you even opposed me gambling. You didn't help me either," Tsunade grumbled when they returned to their room, lightly kicking Yoichi in a fit of small jealousy.
Yoichi, sitting on the bed, explained, "Actually, I oppose it too, because there's something more important tonight."
"More important? What is it?" Tsunade asked, turning around, only to be pulled into Yoichi's arms, sitting on his lap, face to face.
"Pervert," she muttered, seeing the fiery look in Yoichi's eyes, knowing his intentions. Her earlier anger disappeared, replaced by a mix of shyness and excitement.
Tsunade, who had been lonely for over a decade, couldn't resist Yoichi, especially since he was her beloved.
xxx.xxx.xxx.xxx.xxx.xxx
When morning approached, the sleeping Tsunade suddenly smelled something delicious. She opened her eyes to see Yoichi setting food on the table.
"Awake? You only slept for three hours. I was going to let you sleep longer. Shizune came looking for you, but I sent her away," Yoichi said, recalling their night of fulfillment.
"Damn you," Tsunade muttered, blushing as she got up to eat, feeling her legs weaken for a moment. She glared at Yoichi, using chakra to steady herself.
After freshening up, she sat down to eat the magical lamb Yoichi had brought, savoring its taste.
"Tsunade, I might have to go back," Yoichi said suddenly.
Hearing this, Tsunade's good mood vanished. Even the delicious lamb lost its appeal. "Is it because of Mikoto and Mina?" she asked unhappily.
"No, there's trouble in the village. Minato is dead, Jiraiya is seriously injured, and Sakumo asked me to return immediately," Yoichi explained.
"What? Minato is dead, and Jiraiya is seriously injured? Is there a war in the village?" Tsunade asked, shocked.
"It's an enemy we know, one of Jiraiya's former students from the Rain Village, the one with the Rinnegan," Yoichi explained, sharing the recent intel on the Akatsuki. Despite sending a team prepared for the Rinnegan, they suffered heavy losses.
"Jiraiya, that fool. He should have reported the Rinnegan to the village back then. What was he thinking?" Tsunade muttered, realizing the gravity of the situation.
"Mina has already healed the wounded. Sakumo wants me back to strategize. The enemy isn't just Nagato; there are others," Yoichi continued.
"Don't take unnecessary risks. Promise me that!" Tsunade demanded, grabbing Yoichi's hand.
"Don't worry, Tsunade. I won't die easily. We have centuries to spend together," Yoichi reassured her.
"Smooth talker. Don't turn the Senju necklace into a cursed item," Tsunade said, her worry easing.
"I'll take Nawaki with me for a while. If the village needs me, contact me immediately. I want to develop that technique, too. It's almost complete," Tsunade said, referring to the Yin Seal and Strength of a Hundred Technique, which she now hoped to use to maintain her youth.
"Understood. I'll send word when the time comes. You can return to Konoha if needed," Yoichi replied.
Tsunade's face turned slightly red, thinking about their relationship and the potential gossip.
After discussing a few more things, Yoichi bid farewell to Tsunade, Shizune, and Nawaki, and returned to Konoha.
He hadn't expected Jiraiya and Minato to fail together. The enemy was clearly more than just Nagato; perhaps even Obito was involved.
(End of Chapter)