Tokyo Jujutsu High, officially known as the Tokyo Metropolitan Jujutsu Technical College, is a school built in the suburbs.
As the official organization for exorcising Cursed Spirit, Tokyo Jujutsu High covers an extremely vast area, divided internally into several different zones.
Leaving the faculty area where Yaga Masamichi was, Cain and Gojo Satoru arrived at the western plaza.
"What do you want to learn?"
"Black Flash, Reverse Cursed Technique, Domain Expansion. Also, I'd like to inquire about Binding Vows."
"My, my, not holding back at all, are you?"
Gojo Satoru scratched his head, pondering a teaching plan.
Although he was a teacher at Tokyo Jujutsu High, Gojo Satoru wasn't particularly skilled at teaching.
It's like learning math. Some people can see the solution at a glance, and those with sharp minds can even do the calculations in their heads to get the answer.
While the less gifted encounter the same problem, think for a long time without finding a solution, and eventually resort to cheating by looking up the answer, only to realize, 'Oh, it's that simple!', only to face a similar problem next time and still be clueless.
Gojo Satoru belonged to the former category.
As the strongest Jujutsu Sorcerer of the current era, hailed as the one who broke the balance between Jujutsu Sorcerers and Cursed Spirit, he was a prodigious genius who could learn anything in a short time.
When others asked him how he learned, he could only reply after much thought: 'Just do it, you'll get it after a few tries.'
Of course, such a method definitely couldn't be used for teaching.
"Black Flash, Reverse Cursed Technique, Domain Expansion... Among these three, the easiest to teach is the Reverse Cursed Technique. By the way, you already have an exceptional self-healing ability. Do you really need the Reverse Cursed Technique?"
"Super-speed Regeneration is already an invincible path, but having the Reverse Cursed Technique adds another option."
"What's that? Sounds impressive."
"What I mean is: less talk, more teaching."
"Yes, yes, yes~ Class starts now."
Gojo Satoru raised his palm, and a swirling mass of blue-black cursed energy appeared, emitting a powerful pressure.
"First, before the actual teaching, I need to ask how deep your understanding of cursed energy is."
"Anger, jealousy, hatred... The power gained by mastering and extracting these emotions is cursed energy."
"Good, a very standard answer."
Gojo Satoru nodded. "As you know, cursed energy is a negative force. Normally, it can only strengthen the body but not repair it."
"The Reverse Cursed Technique is essentially an application of multiplication with cursed energy. By multiplying negative by negative to get positive, the negative energy of cursed energy is transformed into positive energy."
As he spoke, a new stream of cursed energy emerged within the cursed energy in Gojo Satoru's palm. The two collided and merged, turning the original blue-black cursed energy into a mass of sky-blue energy.
"Simply put, that's how it works. So, Cain, did you get it? If not, it's fine. Even a genius like me only grasped it in a life-or-death situation..."
"I got it."
Cain's voice suddenly rang out.
Gojo Satoru was somewhat surprised. "Really? Don't force yourself just to show off. If you mess up the Reverse Cursed Technique, it could cause your cursed energy to go haywire."
"I know. After all, the Reverse Cursed Technique requires merging cursed energy to produce new properties, demanding high precision in control."
Cain crossed his arms, closed his eyes, and recalled the details of the Reverse Cursed Technique that Gojo Satoru had just demonstrated.
This wasn't difficult for him.
As more and more Cains arrived in the Mist Space, the effect of unification gradually manifested.
Apart from the most basic power-sharing, the Cains discovered another hidden trait: shared comprehension.
The first to discover this was Prince of Tennis Cain.
After the National Tournament and heading to U17, he found his learning ability had skyrocketed.
Through testing, he realized he could learn anything astonishingly fast, almost as if he had a photographic memory.
Relying on this power, he broke through and unlocked the three gates beyond the State of Selflessness.
Among the three gates of the State of Selflessness, the Limit of Wisdom greatly enhances brain function.
Under the combined effects of shared comprehension and the Limit of Wisdom, the current Cain could memorize anything he saw at a glance, as long as he had the intention.
Like a camera, his eyes recorded the process of Gojo Satoru demonstrating the Reverse Cursed Technique in his mind, replaying it repeatedly at high speed.
Simultaneously, Gojo Satoru's explanation echoed in his mind. The details Gojo intentionally slowed down during the demonstration were now magnified further, clearly presented before Cain.
"Make the cursed energy fluctuate in continuous waves, then bring two streams of differently fluctuating cursed energy into contact."
Under Gojo Satoru's watchful gaze, Cain stood still with his eyes closed for a few minutes, then suddenly raised both hands. A mass of cursed energy appeared in each palm, and under his control, they slowly made contact.
The two masses of cursed energy gradually merged into one, and after a few seconds, changed from deep blue to light blue...
Boom!
A dull sound echoed. After an inconspicuous mistake, the two half-merged streams of cursed energy suddenly exploded, creating a recoil that struck Cain.
"Too bad, it failed."
A hint of regret appeared on Cain's face. "I thought I could succeed on the first try. Seems it's still a bit challenging."
"Yeah, what a shame."
Gojo Satoru nodded with feigned calm. "You were just one step away from acing it in one go. By the way, are you really learning the Reverse Cursed Technique for the first time?"
"Of course. I have no reason to lie about this."
Cain tried a few more times on the spot.
With the experience of failure, he gained a deeper understanding of the multiplication application of cursed energy.
By intentionally slowing down the process, he soon completed the multiplication of cursed energy and activated the Reverse Cursed Technique.
"Done. Next."
Cain dispersed the sky-blue energy in his palm.
"Next, should I teach Black Flash or Domain Expansion?"
"Black Flash can't really be taught. I can only tell you some training methods for cursed energy, and the rest is just practice."
Black Flash is essentially the superposition of physical and energy attacks. When the timing error between a physical strike and a cursed energy impact is within 0.000001 seconds, spatial distortion occurs between them, amplifying the power to the 2.5th power of the normal state.
In this world where everyone loves throwing punches and every technique involves getting up close for a few hits, the strength of Black Flash speaks for itself, it could be called the strongest elbow strike technique.
Additionally, those who have executed Black Flash gain a far greater sensitivity to cursed energy than before, manifesting as a significant improvement in fine control over cursed energy and enhanced combat capability.
If there were a way to systematize Black Flash, the overall strength of the entire Jujutsu world would greatly increase, and casualty rates would plummet.
But unfortunately, the conditions for unleashing a Black Flash are too harsh; no Jujutsu Sorcerer can actively perform it, and Teacher Gojo is no exception.
What he could teach Cain were merely some spiritual methods for training cursed energy, allowing him to improve his control over cursed energy as much as possible and minimize the margin of error between physical strikes and the impact of cursed energy. As for whether he could ultimately succeed in landing a Black Flash, that depended on Cain himself.
"The last thing is Domain Expansion."
After telling Cain all the basic training methods, as well as the advanced training methods only accessible to Jujutsu High leadership, Teacher Gojo's instruction entered its final phase.
"The essence of Domain Expansion is consuming a large amount of cursed energy to merge the Innate Domain and the Cursed Technique, manifesting it in the outside world. By the way, what is an Innate Domain? Do I need to explain it?"
"No need."
"That's good. Continuing our previous topic. To learn Domain Expansion, you need to meet three requirements."
Teacher Gojo raised three fingers: "One, sufficient cursed energy. Two, a sufficiently high level of attainment in Barrier Techniques. Three, a sufficiently high level of understanding and development of yourself and your Cursed Technique."
"The first point is the easiest to understand. Domain Expansion is like a finishing move; under normal circumstances, casting it once can drain a Jujutsu Sorcerer's cursed energy entirely."
"The third point is also easy to grasp. Domain Expansion is a deep development of the Cursed Technique. If your understanding of your Cursed Technique is insufficient, you won't be able to merge it with your Innate Domain."
"As for the second point, knowledge of Barrier Techniques is the most crucial part of Domain Expansion. Whether it's manifesting the Innate Domain or merging the Cursed Technique with the Innate Domain, the process requires knowledge of Barrier Techniques."
Saying this, Gojo Satoru paused for a few seconds, giving Cain some time to process. Then he continued, "Cain, what is your attainment level in Barrier Techniques?"
Cain: "Zero."
"Then you should focus on learning knowledge related to Barrier Techniques next. Let me think where to start... Got it!"
Teacher Gojo, like an eagle returning from a long hunt, flashed and disappeared from his spot. When he returned three times, he was carrying a huge stack of books.
"I just borrowed these from the library of the Jujutsu world's higher-ups. They record all sorts of knowledge about Barrier Techniques, starting from zero. Once you learn all of this, you can graduate."
"Thanks."
Cain took the books: "By the way, if the matter of stealing books is exposed, I won't be implicated, right?"
Teacher Gojo waved his hand: "I said I borrowed them. How can you call what a scholar does stealing?"
"Besides, honestly, those old guys collect all these books but don't even read them themselves; they just hoard them to lock away knowledge from ordinary people. We can just return them later."
Cain continued with his previous question: "If this matter is exposed, will I be implicated?"
Teacher Gojo gave a wry smile: "You weren't even afraid of consuming Sukuna's finger, so what's a little bit of this?"
In other words, he would be implicated.
Shaking his head and sighing about having chosen his company poorly, Cain packed up the stack of limited-edition books.
He had learned the Reverse Cursed Technique, and he had the methods for learning Black Flash and Domain Expansion. Coming to Jujutsu High this time had been extremely fruitful; it was not a wasted trip.
However, before class ended, he still needed to ask Teacher Gojo about Binding Vows.
Teacher Gojo: "Binding Vow? That's simple."
Compared to the previous topics, Binding Vow was considered basic knowledge, and the difficulty of learning it was not high.
"A Binding Vow centers on equivalent exchange. To strengthen a Cursed Technique, you must pay a certain price."
"The most basic Binding Vow is the Effect Introduction: by explaining the effects of your Cursed Technique before a fight, you can increase its power and gain an advantage in combat."
"Most people who use this type of Binding Vow are Jujutsu Sorcerers who prefer direct confrontation. Your Current Propulsion is very suitable for this type of Vow. Want to give it a try?"
"Sure."
Cain nodded.
He still remembered what DanMachi Cain had said a few days ago.
Don't set the initial Binding Vow too severely to avoid creating a chain reaction that screws over the other Cains.
To avoid ending up like a certain blue-haired comedic girl who ruins herself in one move, the Effect Introduction was clearly a good choice.
Following Teacher Gojo's guidance, Cain quickly established the Binding Vow and tested it in a mock battle with Teacher Gojo.
The overall effect was quite good.
After introducing the effect of Current Propulsion, the power and range of the lightning increased by 5%.
It didn't seem like much, but in a fight of equal footing, this 5% boost could very well determine the outcome.
"Thanks, Teacher Gojo."
"Oh my, no need to be so polite. Honestly, teaching you was quite easy; it basically didn't require me to use my brain."
Teacher Gojo looked completely relaxed.
What he said was the truth.
He had seen many genius students, the most typical example being Yuta Okkotsu from last year, who learned everything quickly.
But compared to Cain's learning speed, even Yuta Okkotsu would have to admit defeat.
If it were another teacher, instructing such a genius student might lead to frustration, feeling like they themselves were useless.
Teacher Gojo was different; he loved to slack off.
Teaching a genius student like Cain suited his tastes perfectly. If Cain performed well later, he could even take the credit himself.
Perfect! This was the genius teacher, Gojo Satoru!
...The brief period of instruction came to an end.
It was now noon, and the diligent sun was working hard to transfer its heat to the ground.
Walking on the asphalt road hot enough to cook an egg, Cain looked at Teacher Gojo, who was leading the way beside him.
"By the way, have you set up any Binding Vows?"
"Nope, I don't need that kind of thing."
"I think it's better to set one up, otherwise you might be at a disadvantage when fighting Sukuna later."
"Sukuna?" Teacher Gojo paused: "Come to think of it, you fought Sukuna once in the mental world. Did he set up any special Binding Vows?"
Cain replied: "He used allowing people free entry and exit to his domain as a Binding Vow in exchange for a larger attack range. I thought about it carefully, and this Binding Vow seems quite suitable for you too."
Compared to Sukuna's Malevolent Shrine, Teacher Gojo's Unlimited Void was truly a guaranteed hit; the moment an enemy made contact, their brain would crash, instantly killing even Special Grade Cursed Spirits.
"Want to try it? Converting your domain into an Open Barrier Domain through a Binding Vow."
"An Open Barrier Domain... Honestly, it's quite tempting, but I'll think about it later."
Teacher Gojo did not accept the suggestion.
Although Unlimited Void was powerful, it had a drawback: it didn't distinguish between friend or foe.
If he unleashed an Open Barrier Domain in a crowd, the enemies would be instantly killed, but so would the innocent civilians nearby that he needed to protect.
Before encountering an enemy that required him to get serious, there was no need to turn his domain into an Open Barrier Domain; the current one was sufficient.
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