Today was yet another day of me training under my sensei, the Second Hokage of Konoha, the Uchiha Slayer, Senju Tobirama.
What we were focusing on was my sensei's favorite topic—forbidden techniques.
Legends say he creates one every day he spends hating the Uchiha. In the entire Shinobi world, if no one knows who made a jutsu, always place your bet on Tobirama.
He had brought out one of his older scrolls—one he said had "lesser" forbidden jutsu. Lesser, according to him, meant a basic auxiliary in Uchiha slaying, not some ridiculous stuff.
We were inside a closed-off training compound again, far from the eyes of any curious shinobi. Tobirama had set up a basic Fuinjutsu barrier for privacy—simple, yet effective.
He handed me a scroll without ceremony. "Read."
It was a high-level Genjutsu: the Infinite Darkness Jutsu.
The description was straightforward—cast it, and plunge the opponent's world into pitch black. No light. No sound. No bearings.
I started my brain enhancement and read the entire thing again, then thought about it for a moment.
Then I looked toward Sensei and nodded. "Got it."
Tobirama raised an eyebrow. "Already?"
"Yeah. It's not very complex. A simple Genjutsu—very effective, by the way... Though, if we pair it with another Genjutsu that focuses on altering chakra sensing, I guess we can increase the effect even more."
He didn't say anything for a moment, then gave a faint smile. "Your brain really is something else. That's a clever idea… I will try to create a combination Genjutsu if I do get some free time."
"Thanks, I would also try to create something. Genjutsu happens to be my forte," I offered.
He waved a hand, dismissing the moment. "We'll cover more forbidden jutsu later. For now, let's move on to elemental ninjutsu."
Finally.
We moved outside, to a clearing where the ground had already been destroyed a dozen times over by elemental attacks.
"Elemental ninjutsu is based on three things," Tobirama began. "Ninjutsu technique, nature transformation, and shape transformation.
Most people think learning new jutsu is the best way to become stronger. It's not.
I personally believe that shape and nature transformation is the most important. Once you master that, you can create any technique yourself."
I nodded. "Makes sense."
"So," he said, "what's your chakra nature?"
I paused. "All of them."
"…All five?"
"Yeah."
He stared for a moment longer than usual. Then exhaled slowly. "I'd be suspicious if I hadn't already seen the rest of your insane skillset."
"It's not a big deal," I said. "I still have to train the transformations one at a time. Having the affinity doesn't mean I've already mastered it."
"No. But it means you can master them without much difficulty," Tobirama said, then continued,
"With your ridiculous chakra control, there is no need to worry about shape transformation. Frankly, even I am not as good as you in that aspect. So that leaves us with nature transformation."
He stepped forward. "We'll start with Water Style. Since it's the one I specialize in."
He then proceeded to demonstrate the transformation of chakra to water—how it's condensed from the mist in the air, and how he compresses it and gives it any form he desires. He demonstrated a few jutsu—one without the extreme application of nature transformation, and one at full power.
The difference was staggering… It also made me realize, feats like Madara's Majestic Destroyer Flame are more because of his ridiculous nature transformation, and less due to the jutsu itself.
Then it was my turn to perform.
It wasn't easy. Even with chakra-enhanced processing speed, nature transformation required a kind of intuition. A feel for the element itself. You had to feel the element, control it, like an avatar.
One needed to remain calm and feel nature itself—imagine water, be water, or at least, shit like that.
My deadass brain just couldn't sit focused; it was simply running wild all the time. Though, it was also feeding some useful distracting ideas.
Like, if I could practice nature transformation well enough, I might be able to create blue flames from Fire Release, separate components of gases using nature transformation of air, and make stuff like hydrogen bombs…
When such thoughts run in your brain, it's really difficult to focus, trust me.
Still… I made progress. Fast.
Tobirama didn't say anything, but he occasionally made approving grunts. Which, by his standards, was equivalent to thunderous applause.
After water, he explained the other four—fire, wind, lightning, and earth.
I recorded everything in my notes. Patterns. Features. Chakra manipulation used during transformation.
"Even with my enhanced brain," I muttered, wiping sweat from my brow, "it'll take at least a year or two to master all five."
Tobirama nodded. "That's still absurdly fast. But yes. You're right."
We stood there in silence for a bit, as I tried to force a spark from my fingers. It fizzled out. Again.
Then Tobirama spoke.
"There's one more jutsu I want you to try. But you'll need to study Fuinjutsu first."
I turned to him. "Fuinjutsu?"
He nodded. "The technique in question relies heavily on your knowledge of seals. But I don't have time to teach you that field personally."
"That's understandable, I guess… You are the Hokage, after all, and there's a war going on."
"You'll go to Mito," he said simply. "She's the most skilled Fuinjutsu user in the village—possibly the world."
"Grandma Mito? Hmmm… she's from the Uzumaki clan, right? Yes, I did read that they are the best in Fuinjutsu."
"Yes. Well, since she is fond of you, I suppose she would pay extra attention. And she's also been clamoring to meet you ever since she learned about you and Tsunade dating."
"I'm not going to have to give some test to prove something like my worthiness now, would I?"
"I don't know, depends on her mood. Though, if you are feeling underconfident, don't be. At least I do believe that you are worthy of marrying Tsunade." Tobirama said with a smile while patting my shoulder.
"Didn't you say we were too young to date? Now you're already talking about marriage?"
"You just lost my approval too. Prepare for another test."
Sensei chuckled—some of the rare moments you'd actually see him joke.
Yes, he did that. Very rarely, but yes.
"Alright alright, Sensei. Let's focus. So what exactly is the jutsu which you want me to learn Fuinjutsu for?"
Tobirama looked at me seriously. "You have a unique mind, Inaba. Well, at least after you use that brain enhancement of yours. But you were the one who created it, so same thing…
I did not accept you as a student to make you learn everything others have done. No—you're here to create things no one's thought of yet.
And to make that easier, you need to stand on the shoulders of your predecessors and evolve what they have created."
"The jutsu I plan to teach you is called the Flying Thunder God Jutsu. A very rare space-time-based jutsu.
It will also serve as a foundation for you if you wish to research space-time jutsu."
I nodded. "That was always the plan. And Flying Thunder God… well, I don't exactly know how that works, but the name sure does sound badass enough to give it a try."
"Then go learn sealing. You'll need it for what comes next."
He vanished after that—Shunshin, again.
I stood there for a long minute, watching where he'd been.
'Fuck, how can I forget to learn Shunshin… isn't it basically just chakra control?!!!
Damn, the first thing I learn next has got to be it.'
I sighed.
And then, I smiled.
'Fuinjutsu and Flying Thunder God obtained.' Well... That is, If I have the talent for that...