After the Third Hokage warned Danzo, although Danzo was quite annoyed, he indeed stopped sending people to monitor Yoruha. Danzo didn't really have any personal grudge against Yoruha. It was just that he couldn't stand Yoruha being designated as the successor by the Third Hokage. Becoming Hokage was Danzo's greatest wish, something he had dreamed of day and night for decades. To achieve this, he was willing to eliminate anyone in his way, including his former comrade, the Third Hokage.
Even though he stopped having Yoruha watched, Danzo was still lurking in the shadows, waiting for Yoruha to make a mistake. As soon as Yoruha committed an error significant enough to prevent him from becoming Hokage, Danzo would have a justified reason to oppose the Third Hokage's recommendation of Yoruha for the position. Meanwhile, after Yoruha noticed the disappearance of the ninja presences around him, he wasn't sure what had happened.
But having no one watching him was undoubtedly a good thing. Sitting cross-legged in his room, Yoruha was summarizing the jutsus he had noted down that day.
The Gate of the Great God, Flying Thunder God Technique, Rasengan, and even the Impure World Reincarnation—he had noted them all. He recorded the Impure World Reincarnation not because he wanted to use it to summon the dead, but so he could dispel it if he ever encountered it. After all, dealing with an opponent using the Impure World Reincarnation could be quite troublesome.
He spent several hours summarizing until it was already early morning. Only then did Yoruha open his eyes. "As expected of forbidden jutsu, the difficulty is indeed high."
With that, Yoruha raised his right hand. His gaze focused slightly, and the chakra within him surged rapidly. Instantly, a golden chakra sphere appeared in the palm of his hand. The glow of the golden chakra sphere illuminated Yoruha's room as if a light had been turned on.
Looking at the chakra sphere in his hand, Yoruha murmured to himself, "So this is the Rasengan? It's quite interesting." After observing it for a while, a bold idea formed in Yoruha's mind.
"Let's hope it doesn't fail. If it does, I'll be paying off a mortgage for the rest of my life." "Buzz, buzz, buzz..." As soon as Yoruha finished speaking, the chakra sphere in his hand transformed into a rapidly spinning golden chakra shuriken.
Suddenly, a storm whipped through the room, shredding the furniture into pieces. "So this is the Rasenshuriken, its power is indeed immense."
"If I make it any bigger, this house will be uninhabitable." Yoruha glanced at the scratches in the room left by the wind blades, reluctantly retracting the Rasenshuriken in his hand.
Next, Yoruha prepared to experiment with the Flying Thunder God Technique. He himself didn't realize the outrageous feat he had just accomplished. Naruto had gone through tremendous hardships to develop the Rasenshuriken, yet Yoruha had mastered it in just a few hours of study.
He hadn't even practiced it before. If Jiraiya knew, he'd probably be green with envy, considering how long it took him to master the Rasengan back in the day.
The most outrageous part was that Yoruha not only mastered the Rasengan but simultaneously grasped the Rasenshuriken. Yoruha could even infuse it with Lightning Release. The reason Yoruha found it so easy, besides his extraordinary talent, was because he used Sage Chakra.
He completely bypassed the issues associated with the Rasenshuriken.
The power of the Rasengan Shuriken was immense, but Yoruha wasn't surprised, nor did he feel the desire to use it in future battles. His Lightning Release was no less powerful, perhaps even stronger, especially the Lightning Net. Just like how Naruto would use the Rasengan in almost every battle after learning it, Yoruha's favorite technique in combat was the Lightning Net. He didn't even favor using Chidori or its derivative jutsu.
After all, the Lightning Net was something Yoruha developed himself, and using something he created felt much more natural, possibly due to psychological reasons. But Yoruha genuinely preferred the Lightning Net. He spent the entire night in his room practicing the jutsu he had memorized today.
Training in the room was inconvenient, but Yoruha didn't need to fully unleash the jutsu. Since he had mastered the techniques, his control over them was very high, allowing him to scale down the jutsu to avoid damaging the room. Despite having Kage-level strength, Yoruha cherished his only property very much.
After all, whether he could live comfortably in the future depended heavily on this house. With this house, he could save all his future income. Without it, Yoruha would need to spend a significant amount of money to buy a similar place, likely requiring a loan.
The thought of having to work hard every day to pay off a mortgage made Yoruha treasure his current house even more. He practiced until midnight, mastering all the jutsu, and just as he was about to rest, a long-awaited voice echoed in his mind: "Your speed has increased to spatial level, your physical attributes have doubled, your energy source is now bound to planetary level, and your chakra has doubled."
Yoruha was stunned. His system hadn't notified him in a long time. He thought it was because his body had reached its limits and couldn't improve further.
So the system hadn't given any updates. Yoruha quickly noticed some changes in the system's message this time. "What does it mean by energy source bound to planetary level?"
Yoruha didn't understand this definition at all. However, he did feel the doubling of his chakra. He sensed his chakra was now incredibly abundant.
"Whatever planetary level means, it must be something impressive, but the doubling of chakra is something I can clearly feel." With his chakra doubled, Yoruha's chakra level was now at the Tailed Beast level, excluding the Nine-Tails, of course.
Most importantly, Yoruha's chakra was Sage Chakra, so with the same amount of chakra, Yoruha's was clearly more enduring. The same jutsu consumed much less chakra when Yoruha used it. Not to mention Yoruha's incredible chakra recovery speed.
Previously, it took him about ten minutes to recover his chakra. Now, even with the increased chakra, Yoruha felt he only needed six or seven minutes to recover from a depleted state to full. "The doubling of chakra must be related to the doubling of physical attributes, as you need sufficient physical strength to support such a vast amount of chakra."
"But what exactly is this planetary level energy source? It seems like something very powerful." "From the literal meaning, does it mean my previous energy source was natural energy, and now it comes directly from this planet?"
Yoruha speculated. "Why doesn't this system provide an explanation?" Yoruha was quite frustrated.
Planetary-level energy source and natural energy are different. After all, the Divine Tree absorbs the planet's energy to produce chakra fruits. Clearly, the Divine Tree hasn't absorbed all the planet's energy, far from it.
Otherwise, the planet wouldn't have enough energy to maintain its state. And Yoruha was well aware of how massive the Ten-Tails' chakra was. Of course, all of this was Yoruha's speculation.
But Yoruha felt his guess was correct. And indeed, Yoruha's speculation was right.