In the end, we settled on a class demonstration. A fair trial, I suppose, though I had no intention of revealing too much. As we walked back to the classroom, Gakuganji joined us, his presence adding a subtle but noticeable shift in the atmosphere.

I had already begun forming mental profiles of the two. Iori Utahime was an intriguing woman—strong-willed, perceptive, and composed under pressure. The way she carried herself suggested a deep-seated confidence, the kind forged through experience. Her long, blackish-purple hair flowed down her back, and the scar on her face told a story of battles fought and survived. She had the makings of a skilled kunoichi, though I suspected she had chosen a different path.

Gakuganji, on the other hand, was an entirely different breed. As we walked, I felt a faint hint of bloodlust emanating from him, an old but sharp blade that had seen countless battles. He was an experienced warrior, hardened by time and conflict.

The bloodlust vanished as quickly as it appeared.

"You've experienced war before, boy, haven't you?" Gakuganji asked, his voice cutting through the silence like a knife.

"War is every day," I responded simply, keeping my tone even. There was no need to elaborate; he would understand the weight of those words.

Gakuganji laughed, a deep, rumbling sound that echoed down the hall. "I like that attitude!" he said, his eyes gleaming with approval.

It seemed the old man and I would get along just fine, at least for now. But the real test was yet to come. As we approached the classroom, I prepared myself for the demonstration, ready to show them exactly what I was capable of—on my own terms.

Once inside the classroom, Gakuganji immediately made his way to the furthest back of the room, settling into a seat where he could observe without drawing too much attention. Iori, on the other hand, swiftly moved among the students, collecting the essays she had assigned earlier.

After gathering the papers, she turned to the class, her voice carrying a tone of authority. "Alright, today's lesson will be a bit different," she announced. "Standing beside me is Uchiha Madara, who wishes to teach at this school. He will be conducting a class demonstration, while the principal and I act as observers. Pretend that we aren't even here."

A grin spread across Todo's face as he nudged Kamo with a smirk. "Looks like I won the bet," he teased.

Kamo, visibly annoyed, shot back, "I didn't even agree to the bet."

"Behave, you two," Nishimiya interjected, her voice calm but firm, aiming to keep the peace.

Iori, now seated at the back of the classroom beside the principal, looked at me and said, "You have two hours."

With that, the stage was mine.

I've had various theories about Cursed Energy since learning about its existence. It was essentially spiritual power, yet in this world, it was perceived differently—primarily as a power source stemming from negative emotions. To be honest, their techniques using Cursed Energy were remarkable... I might even say they would surpass most Yin Release techniques from my old world.

However, to a group of Jonin, Yin Release would mean very little—just another tool in a vast arsenal. But Cursed Spirits? Those could pose a real threat to the shinobi of my past life.

As I stood before the class, I considered what I should teach these students. Teaching them Yin Release seemed too straightforward, almost lazy. Revealing techniques that would undoubtedly be seen as exotic and rare in this world could potentially land me in hot water.

Meanwhile, there was Chakra: an energy created by the combination of physical and spiritual energies. Jujutsu Sorcerers, on the other hand, focused almost exclusively on spiritual energy.

I decided on a direction for the lesson. "What do you know about Chakra?" I asked, my voice cutting through the murmurs in the classroom. All eyes were on me.

Kamo raised his hand, and I nodded for him to speak.

"It originated from the Sanskrit word cakra or chakra, which means 'wheel of life,'" Kamo explained, with an almost bored tone. "They were perceived as spinning wheels or circles through which life energy flows within the human body. But is this even relevant to the class? I know this is a class demonstration, but I'd rather not waste my time on useless history lessons."

Before I could respond, Todo burst out laughing and slapped Kamo on the back. "Loosen up, Kamo! How about you come with me this Saturday and we visit Takada-chan?"

Nishimiya sighed with a hint of exasperation in her voice. "Boys..."

I decided to cut the chatter. "Quiet," I commanded, summoning my Sharingan. The sudden shift in my eyes instantly silenced the trio. "If you want to talk, you raise your hand. Am I clear?"

They nodded, their previous banter quickly forgotten. The room fell into an attentive silence, the weight of my gaze holding them in place. My Sharingan always had that effect on people. Being subjected to Yin Chakra was uncomfortable after all.

I unsummoned my Sharingan, allowing the tension in the room to ease slightly, and continued with my lecture. "Chakra is a form of elevated energy, created by mixing physical energy with spiritual energy. It embodies the yin and yang, the positive and negative, the sun and moon, and so on. The analogies are endless."

As I spoke, I noticed Iori frowning. Perhaps diving straight into the concept of Chakra had been too much for them. I had thought I was holding back enough, but her reaction was understandable. Still, I hadn't changed my mind. Even if they failed to grasp Chakra entirely, it would still aid in their understanding of how to manipulate their cursed energy.

"When you use your cursed techniques, they aren't visible to the mundane eye, correct? That's because they only exist spiritually. But what if they could exist physically?"

"That's impossible, right?" Nishimiya muttered, almost to herself.

I turned my gaze to her, and she quickly realized her mistake.

"I'm sorry," she apologized, her voice demure.

Todo raised his hand, his burly physique looking quite comical since he was sitting in the middle, "I have a question— what use is there in learning this? Does chakra make killing cursed spirits easier?"

I couldn't help but be amused by the question. "No," I replied with a slight smile. "But it does make killing people easier."

A short silence followed, the weight of my words sinking in. I almost forgot that this era's focus was on slaying cursed spirits, not on taking human lives. But I had already accounted for that. Raising one hand, I demonstrated a simple Fire Release, letting flames flicker into existence on my open palm. The students watched, their eyes wide with curiosity.

"Besides making killing easier, mastering Chakra will help you derive more techniques, bolstering your arsenal. Perhaps starting with the five elements." I raised my hand higher, and with each movement, the flames shifted forms—water, earth, wind, lightning, and then fire again.

Their expressions ranged from awe to contemplation as they absorbed the implications of what I had just shown them. The demonstration was far from over, but I had their attention, and that was all I needed.

I was most proficient with Fire Release, but I could handle the other nature transformations just fine. With my experience, it was almost impossible not to pick up a bit of everything. Even Hashirama had a grasp on various techniques, though he wasn't as adept as I was when it came to accelerated learning. The Uchiha were simply built differently.

Nishimiya raised her hand, bringing me back to the present.

"What is it, Nishimiya?" I asked, noticing her slight fluster at being addressed by name.

"Sensei, you mentioned the five elements. Is it from Japanese Buddhism or Chinese Cosmology? If it's the former, then the lightning element should be the void element… but isn't metal closer to lightning? I don't know… I hope you don't think my question is stupid."

I understood where she was coming from. Even in my old world, some villages attributed the power brought by chakra to religious beliefs. "There is no connection to it," I replied. "It's simply energy, nothing more. Approach Cursed Energy as an object of inquiry—what's the word? Science. Yes, treat it as a science. Most myths and theological aspects were merely traditionalist methods designed to carry techniques through the generations. That's why they are grand, feared, and revered. But in the end, they are still just power. There's nothing divine about it."

I paused to let my words sink in, then continued, "Treat them as such, and you'll grow to understand them. The more you understand, the stronger you'll become."

Gakuganji faked a cough, breaking the momentary silence. "It doesn't mean traditions have to be forsaken, though," he remarked, his tone firm but non-confrontational.

"But if you find a better way," I countered, "it is advisable to forsake outdated methods: revise the traditions, preserve the knowledge, and then further refine them."

Gakuganji faked another cough as if to emphasize his point. "Still, their cultural value shouldn't be ignored," he insisted, his voice carrying the weight of years steeped in those very traditions.

I let his words hang in the air for a moment before deciding to shift the direction of the lesson. "How about a real demonstration then?" I suggested. Turning to Iori, I asked, "Miss Iori, does the campus have a large lake? The larger it is, the better."

Iori looked momentarily surprised by the request but quickly regained her composure. "Yes, there's a lake at the southern end of the campus. It's quite large, actually."

"Perfect," I said, a faint smile playing at the corners of my lips. "Let's take this lesson outside. I'll show you all something that will demonstrate the practical applications of Chakra in a way that words cannot."

With that, we began to make our way towards the lake.

What could be the reason why knowledge of chakra and ninja arts had vanished in this world? The existence of Cursed Energy—or what I would call Yin Chakra—indicated that shinobi had once existed. Yet, now we had Jujutsu Sorcerers instead. It was a mystery that gnawed at the back of my mind as we made our way to the lake.

When we arrived, I stood at the edge of the water, contemplating the task ahead. "Principal," I began, turning to Gakuganji, "is it okay to vaporize the lake?" It was a manageable task, not much harder than vaporizing part of the sea.

Gakuganji's response was as simple as it was indifferent. "Suit yourself."

Without further hesitation, I performed a single handseal, focusing my chakra and molding it within my lungs, transforming it into flames. Then, with a powerful exhale, I unleashed the technique: Great Fireball Jutsu. A gigantic orb of fire erupted from my mouth, colliding with the lake's surface. The water sizzled and hissed, vaporizing under the intense heat of the flames until the entire lake was shrouded in steam.

"That should be an innate technique, right?" Kamo asked, his voice tinged with hysteria as he tried to comprehend what he had just witnessed.

"No, it isn't," I replied, crossing my arms. "This is a basic ninjutsu technique, one that any shinobi could learn with proper training. And if you could learn even a single aspect of how to manipulate physical energy and mold it into your techniques, you'd grow so much stronger."

The students were precious to me—not just as potential allies, but as research subjects. It would be beneficial to foster a good relationship with them. "Kamo, what is your cursed technique?"

"Blood Manipulation," he answered with a hint of pride in his voice.

"Let me guess," I said, studying him closely, "you get anemic after using your technique. You don't replenish your blood quickly enough to sustain your technique for long periods of time. However, if you managed to elevate your cursed energy with physical energy, you'd be able to do so much more. The possibilities are frankly endless."

Kamo's eyes widened as he processed what I was saying. The gears in his mind were already turning, considering the implications of combining physical energy with his cursed techniques. The other students were similarly affected, their expressions a mix of awe and curiosity.

"How about me?" Todo asked, his excitement evident. "I can swap the locations of two different people or objects with a single clap."

I considered his ability carefully. Space-time techniques were complex, and not really my area of expertise, but I could still offer some guidance. "It depends," I began, assessing the potential of his technique. "What are the limitations of your power?"

Todo thought for a moment before answering. "I couldn't swap my targets if they were, of course, beyond my range."

I noticed Iori shifting uncomfortably, perhaps uneasy with how openly Todo was sharing his ability. But I pushed on, unfazed. "You could possibly create ports or marks that you could leave on objects or people to eliminate distance. If you master it, it's highly likely you would be able to use your cursed technique without needing to clap at all."

Todo's eyes lit up at the prospect. "Huh? That's incredible!" he exclaimed, walking over to me with enthusiasm. Before I could react, he started slapping my back in approval, his strength making the impact far more intense than I'd anticipated.

I remain rooted in place.

It would be a shame if he'd just tossed me away. It was a display of camaraderie, one I hadn't quite expected, but I let it slide. And then there was Nishimiya. "How about me? I can telepathically control my broom, a cursed tool, allowing me to levitate it independently of myself. I can use my broom to strike and can generate powerful gusts of cursed energy wind."

I could tell she was anxious.

"The most obvious application would be strengthening your Wind Release techniques," I began, considering the possibilities of her abilities. "But there's more to explore. You could potentially develop puppet techniques, controlling multiple tools or objects simultaneously. And then there's the Mind Transmission technique—a technique traditionally used to communicate telepathically with others. But with your ability, you could adapt it to control your tools more precisely, and eventually, perhaps even extend that control to other people."

Nishimiya's eyes widened as she absorbed the implications of what I was suggesting. It was clear she hadn't considered the full extent of her potential. "With enough training and the right mindset, your abilities could evolve beyond what you've imagined."