Early the next morning, in the Senju compound, Arata slowly opened his eyes. After a full night of training, he could clearly feel that his chakra had become more abundant and refined.
Turning his head, he saw that Shizune and Kushina were already awake. The diligent Shizune was preparing to run laps around the courtyard, while Kushina was sitting nearby, seriously focusing on chakra refinement. It was clear that after everything that had happened the previous night, the little girl had quickly pulled herself together and had already begun walking down the path toward becoming a pinnacle of the shinobi world.
However, Kushina's current training method came straight from traditional Uzumaki practices. While it couldn't be called outdated, if the goal was to rapidly increase combat strength, it was far from sufficient.
Arata stepped closer to Kushina and said calmly,
"If you keep training like this, you'll never reach the peak of the shinobi world in your entire life."
This wasn't an exaggeration.
The Uzumaki clan's training traditionally placed heavy emphasis on spiritual power, which was why they excelled at powerful sealing techniques. The strength of sealing jutsu was, in essence, determined by one's mental energy.
Sealing techniques were indeed formidable—but in battles between top-tier fighters, relying solely on sealing jutsu was never enough. Especially once combat reached the super-Kage level and beyond, if your chakra reserves weren't deep enough and your speed wasn't fast enough, you wouldn't even get the chance to act.
At that level, everyone's offensive power was terrifying—destroying an entire town with a single move was trivial. Without solid defensive techniques, everything else was meaningless.
Yet Uzumaki training focused almost entirely on spiritual cultivation, with only minimal attention given to taijutsu. That was an enormous waste of the Uzumaki clan's natural physique.
In the original history, aside from Uzumaki Naruto, nearly every Uzumaki gave off a frail, sickly impression—as if they could be knocked over with a light push. That alone showed how little importance the clan placed on physical training.
Kushina was in the middle of refining chakra when she heard Arata's voice. She quickly opened her eyes and saw him standing there with a slight frown on his face.
She had heard him clearly—but she was still just a child. Up until now, she had trained exactly the way her elders taught her, without ever thinking too deeply about it.
Now, hearing Arata say that continuing this way would mean she could never reach the peak of the shinobi world, she immediately panicked. After all, that was now her greatest wish.
"Arata-niisan… then how should I train?"
Faced with her question, Arata first carefully examined Kushina's bone structure. She was already mostly developed—more than ready to begin more demanding physical training.
Children in the shinobi world matured early. Arata knew this well—he himself had begun training at three or four years old. In his previous life, training at that age would have ruined the body, but in this world, it posed no problem at all.
Since he had decided to guide Kushina properly, starting with the Six Powers (Rokushiki) was the most suitable choice. Once she fully mastered them, her taijutsu alone should reach the level of an elite jōnin.
If that were combined with Hawk-Eye–style swordsmanship, Kushina might even step directly into Kage-level strength.
These techniques looked difficult on the surface, but in reality they were far more efficient than pure chakra training. By the time the One Piece World reached the Sabaody Archipelago arc, only a few months—at most half a year—had passed, yet Luffy and the others' growth could only be described as explosive.
At the beginning, they were little more than physically strong and durable. But later, one powerful technique after another was developed. The Six Powers were mastered after seeing them just once, and Zoro had already learned how to cut steel.
All of that happened in just a few months.
After the two-year training period, every member of the Straw Hat crew experienced another massive leap in strength. That growth rate alone proved how well the One Piece World's training system was suited for rapid advancement.
And that was precisely what made it perfect as a foundation for the shinobi world—a world that truly bloomed in the later stages.
In the early phase, one could rely on One Piece World taijutsu and swordsmanship as a bridge, while steadily maintaining chakra training. Then, in the later stage, transitioning fully into the shinobi system would result in balanced growth and consistently strong combat power.
Although Kushina was a girl, training in Marine-style taijutsu wouldn't be a problem at all. The One Piece World had no shortage of powerful women—one of the Four Emperors was a woman, after all.
More importantly, Arata's ability had already reached the awakened stage. Using it to stimulate muscle development and cellular division was effortless now.
And it wasn't limited to himself—he could do the same for others without causing any harm.
With that absolute advantage, Arata was confident he could train Kushina all the way to peak super-Kage level.
Just improving her muscle activity alone would eventually give her taijutsu comparable to the Lightning Style Armor of the Land of Lightning.
And because Arata's training methods were far more advanced, her ultimate achievements would definitely surpass even the Third Raikage.
Having made his decision, Arata immediately began directing Kushina into basic physical conditioning.
"Start with taijutsu. As for the Uzumaki clan's spiritual training—you can do that at night."
The moment she heard "taijutsu," Kushina's eyes lit up. She was actually a fiery, aggressive girl at heart and had always been interested in close-combat fighting. It was just that her grandmother had insisted she behave like a proper lady, so she'd rarely been taught taijutsu.
In truth, taijutsu was what she had wanted to learn the most.
Especially since Arata himself had risen to fame through taijutsu. His lightning-fast speed was legendary—even if Kushina hadn't seen it with her own eyes, she had heard all about it.
"Okay! Arata-niisan —tell me how we're training!"
Seeing her excitement, Arata rubbed his forehead helplessly. This little girl really did have a fiery temperament—liking taijutsu at such a young age.
In the shinobi world, many young girls avoided taijutsu entirely, worried about scars or ruining their appearance. Kushina, however, had none of those concerns.
In that regard alone, she already surpassed the future heroine, Sakura.
Although Arata had said they would train taijutsu, he didn't start with physical drills right away. Instead, he took out a sheet of chakra test paper.
"Let's check your chakra nature first. Then I can decide the direction of your future training."
Kushina didn't take the paper. Instead, she said,
"I've already tested it before. My chakra nature is Wind and Water."
Hearing that, Arata frowned slightly.
Looks like the plan to teach Kushina lightning-based techniques—especially the bird-style Lightning Release most suitable for physical enhancement—wasn't going to work after all.
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