I'm using ninjutsu in Jujutsu Kaisen!

Chapter 150: Domain Expansion: Mirror-Formed Duplex

Seeing Jogo flee, Gojo Satoru felt nothing in particular, only musing internally that the jujutsu world was about to become more and more interesting. Special grade cursed spirits with intelligence were gathering together; were they planning something big?

"Huff… huff… huff…"

His body restored, Jogo lay on the ground gasping for breath, his eyes filled with sheer terror! That man… was simply too horrifying. He couldn't even deploy his domain before being instantly defeated.

"Are you alright?" Hanami asked, looking at the kneeling Jogo.

"I'm fine. Thank you, Hanami. I almost died at his hands."

Jogo wiped the blood from the corner of his mouth, now fully understanding why Gojo Satoru dared to call himself "the strongest"! He had been completely dominated. Even if they all attacked together, the result would likely be the same. They had to use the Prison Realm in Geto's hands to seal him!

Otherwise, a world where only cursed spirits existed would be nothing but a joke!

"Let's go back and see what plan that guy Geto has. Hanami, please go inform Mahito to run as soon as he sees Gojo Satoru, or he will die!"

"Understood."

After Hanami responded, flowers bloomed beneath its feet. As a giant flower bloomed and closed, Hanami vanished from the spot.

"…Let's go back. How can such a terrifying human exist in this world?"

Jogo sighed and left directly. These past two days had left him traumatized. He nearly died yesterday, and he nearly died again today. If he didn't stop to recuperate for a few days, he would probably truly die tomorrow!

"Gojo Satoru is as formidable as ever."

Suguru Geto, who had followed out of curiosity, now stepped out of the darkness. In his hand, he held a cube. But strangely, the cube seemed to be alive; dozens of human eyes slowly opened, their black pupils gazing at the surroundings before slowly closing again.

"I originally thought Jogo could create an opening to seal him just now, but I didn't expect him to be defeated so instantly, leaving no opening at all. We'll have to stick to the plan."

With that, he turned and left, his black and gold kasaya melting completely into the darkness as if he had never been there. All things in the world are but chess pieces. To make the jujutsu world more lively, isn't this a reasonable sacrifice?

The night deepened.

Mahito, wandering the streets, scanned his surroundings. He knew his soul had not yet recovered and he couldn't defeat Tatsuro, but he had to find himself some fun toys…

The next day.

Tatsuro woke up and opened his eyes. Feeling the unusual presence on his body, he knew Noa Yorishie had once again ignored his advice, graduating from hugging his arm to using him as a bolster pillow.

He gently removed Noa Yorishie's right arm, then got up and left. After a quick wash in the bathroom, he put on his shoes and went out. He was going to Gojo-sensei's place to learn Domain Expansion.

The ultimate move of a jujutsu sorcerer!

Of course, this technique was also extremely draining on cursed energy. Whether it was Ryomen Sukuna or Jogo, their cursed energy levels plummeted after using it. It could only be used as a finishing move.

He had to admit, he even doubted if he could learn it. After all, Jogo's and Ryomen Sukuna's domains were both related to their cursed techniques. One was a molten volcano, and the other was like a person wielding a dining knife to slice up a meal on a plate.

As for his own cursed technique, he didn't quite understand it himself. This body was originally that of an ordinary person; the cursed energy, the Sharingan, and the ninjutsu were all granted by the system.

But whatever. He would cross that bridge when he came to it. He'd learn first and worry about not being able to do it later. There was no loss for him either way.

Leaving the dormitory, Tatsuro headed straight for Gojo Satoru's residence. It was only 5:35 AM. While he felt it might be a bit rude to go so early, it was just a feeling. His conscience felt no unease.

After all, a joyous activity like learning must be done as early as possible.

Knock, knock, knock!

Arriving at Gojo's door, Tatsuro knocked and shouted, "Gojo-sensei! Time to get up! I'm here to learn Domain Expansion."

"I've been waiting for you!"

Gojo opened the door with a potato chip in his mouth. A hint of fatigue touched the corners of his azure eyes, and the boisterous sound of a TV show drifted from inside the room.

Without a doubt, Gojo Satoru hadn't slept all night, seemingly having watched TV for the entire duration. One could only say, as expected of Gojo Satoru. No wonder he usually wore an eye mask; it was for the convenience of falling asleep at any time.

"Um, but Gojo-sensei, are you really okay not sleeping for a whole day?" Tatsuro asked, puzzled.

"It's fine, it's fine. I don't have much to do recently anyway, just relaxing a bit. Want to watch with me? It's very touching, you know!"

"…"

Tatsuro was speechless. He had just returned the day before yesterday, and today he was already slacking off again. But there was nothing he could do. This was Gojo Satoru, after all—cheerful and untroubled.

He said, "We can talk about watching TV later. Teach me Domain Expansion first!"

"Is that so…"

Looking at the excited Tatsuro, a smile bloomed on Gojo's lips. "Alright, I'll explain the principles of a domain and then demonstrate it for you. Whether you can learn this depends entirely on individual talent, which means even if I teach you, you might not be able to do it."

Gojo walked into the room, picked up the remote to turn off the TV, and called out to Tatsuro who was standing at the door, "Come on in."

"Eh!?"

Tatsuro was surprised. "We're learning right here in the room? What if we wreck the place?"

"We won't. A Domain Expansion is just a large-scale spatial barrier constructed from one's Innate Domain using cursed energy. As long as you control the range and pull people into the domain, it won't destroy the furniture. Of course, open domains like Ryomen Sukuna's are an exception. Hurry up and come in."

"Oh, excuse me for intruding."

Tatsuro took off his shoes and walked in. He glanced at the tidy surroundings before fixing his gaze on Gojo, who was sitting on the floor.

"Luo, you've witnessed a Domain Expansion, haven't you? It's about manifesting the world deep within your heart using cursed energy."

Gojo patted the clean floor, gesturing for him to sit. He continued, "You can close your eyes and try to enter your inner world. Don't restrain your desire for it, and then manifest it with your cursed energy."

"Okay."

Tatsuro sat on the floor and closed his eyes. He had entered his inner world several times before, so this time, instead of his inner world actively pulling him in, he was pushing the door open himself.

Click—

Finding the depths of his heart, Tatsuro pushed open the door and walked in. He gazed around. This place was like a pure land of eternal night, with stars shining brightly. But unlike last time, the dark ground had become a water-like mirror, reflecting the sky and filling one with a sense of joy.

The boy didn't know what kind of destructive power this domain would have, but right now, he just wanted to completely construct it in the real world with his cursed energy. His bare feet stepped onto the water's surface, causing ripples to spread.

Tatsuro looked down at his reflection in the water. It seemed to have an independent consciousness. Its black pupils turned scarlet as the Sharingan rapidly evolved.

His own eyes began to turn in unison until they reached the Mangekyo stage. At this moment, Tatsuro seemed to be acting in sync with his reflection in the water, but he himself didn't feel anything was amiss.

He saw his reflection slowly bring its hands together, then form a hand seal. It spoke: "Mirror-Formed Duplex."

CRACK—

Tatsuro, who had been standing on the water's surface, instantly shattered like glass.

Tap, tap…

A crisp sound echoed. The "shattered" Tatsuro had now reformed on another side, gazing at a pitch-black space around him. At this moment, he seemed to be outside his Innate Domain…

But it didn't seem quite like that…

Because he could feel everything within the domain…

It was a strange feeling. It seemed he could even return to the domain…

The boy glanced around, then looked down at the world within the domain, discovering that another reflection of himself had appeared there. Tatsuro raised his right hand and slowly clenched it, his eyes fixed on the other side.

The reflection performed the same action without the slightest delay, as if it were a true mirror…

As Tatsuro's consciousness actively switched, his form cracked again and then shattered. It was as if there were two planes of existence, and he could switch back and forth between them. A very strange feeling…

Looking at the stars reflected in the water and the "self" that was reforming on the other side, Tatsuro had a bold guess: his domain might be related to his eyes.

It was certain that a domain was linked to one's cursed technique. He had seen that for himself. But what cursed technique did he have? The only thing he had unlocked on his own was this Mangekyo Sharingan.

'Mirror World' and 'Mirror Shatter'. It now made sense that the domain's name was 'Mirror-Formed Duplex'. As for its combat application, he would have to pull Gojo-sensei in to see.

He could only speculate this much on his own. He needed to bring in a professional to take a look.

Tatsuro walked out of the great door and slowly opened his eyes. The moment he did, he saw Gojo-sensei's face up close. He asked, confused, "Gojo-sensei, what are you trying to do? Did I not wash my face properly?"

"No, I was just curious about what you saw in your inner world. You've been sitting there for an hour."

"An hour?!"

Tatsuro was shocked. He had just pushed a door and run a test; it felt like he had been active in a dream for five minutes. How had an hour passed in reality!?

"Yeah. But that's not important. Did you find the answer you were looking for?"

"Yes, I think so…"

Tatsuro nodded, then brought his hands together to form a seal. He wasn't sure if he could cast it, but he still followed the hand signs guided by "him" and said, "Domain Expansion: Mirror-Formed Duplex."

Swoosh—

A black barrier instantly enveloped the two of them. Gojo stood up and looked at the black barrier in amazement. "Amazing, you cast it on your first try! Luo, you've already entered the ranks of 'the strongest'!"

Drip—

The sound of a water drop echoed in their ears. The surrounding scenery began to change. A vast, starry sky was reflected in the water below. Such a beautiful sight was a rare find even in this day and age, seeming to reflect the caster's state of mind.

"Whew…"

After casting the technique, Tatsuro felt a bit exhausted. A large portion of his cursed energy had been instantly drained, which was hard for him to accept for a moment. As expected, something like a domain was still a bit much for him at his current level, but at least he had managed to cast it.

He said, "This is more or less it. Gojo-sensei, could you spar with me a little? I need to test something."

Seeing Tatsuro already in a fighting stance, Gojo was delighted. He raised his right hand and waved it. "Come at me with everything you've got."

CRACK—

Receiving Gojo-sensei's permission, Tatsuro instantly shattered and arrived on the other side of the domain. Looking at the reflection of Gojo-sensei "outside" the domain, Tatsuro instantly attacked.

Unlike when he entered his Innate Domain, the moment he cast the domain, he knew everything about it. After all, it was constructed from his own cursed energy!

His body could be freely swapped between the two realms of the domain, but there was a one-second interval, as the "replacement mirror body" needed time to reform. The principle of the technique was simple: replacement.

Of course…

There was another, more fun aspect. From "outside" the domain, the ninjutsu he cast could directly reach the inside of the domain. It didn't require constructing a "replacement mirror body"; all it needed was a mirror to carry the technique out.

How interesting!

Tatsuro's hands quickly formed seals. He uttered softly, "Lightning Release: Thunder Tiger Killer!"

The crackling sound of lightning rang out as a thunder tiger was constructed, galloping across the ground and biting towards the reflection of Gojo "outside" the domain.

Gojo also seemed to realize that something was wrong. The current Tatsuro seemed to be in a different dimension from him!

His shattered body was reforming, but what was different was that a thunder tiger was charging in the water's reflection, while it didn't exist in the real world!

CRACK—

The thunder tiger shattered a second before touching "himself." With a swoosh, a mirror instantly appeared in front of him. A one-meter-tall thunder tiger emerged from it. Although made of lightning, it lacked none of the imposing aura of a tiger roaring in the mountains.

It leaped out of the mirror and bit down on Gojo Satoru!

"An interesting domain!"

That was what Gojo thought. The moment the thunder tiger touched him, it was stopped by his Limitless cursed technique. But that was only because the technique he cast was too weak. If he used a stronger technique, he might be able to neutralize his Limitless.

After all, a domain was equivalent to a "buff," greatly enhancing the caster's state. The techniques cast would be strengthened in the future. He just didn't know if his own domain could pull him in. If it could, it would be manageable. If not, then things would get interesting.

After all, his real body was on the other side!

"It's effective!"

Tatsuro's expression was ecstatic. He immediately rushed towards the stationary Gojo. A blue light appeared in his right hand as a Rasengan appeared and began to expand.

The "replacement mirror body" inside the domain also rushed forward, but without the expanding Rasengan in its hand. Tatsuro leaped up, holding a Great Ball Rasengan, and charged towards Gojo's mirror reflection. Just as he was about to touch him, his body instantly shattered.

Arriving inside the domain, Tatsuro pressed the Great Ball Rasengan towards Gojo!

K-K-K-K…!

A scraping sound reached Tatsuro's ears. The expanding Great Ball Rasengan was frantically neutralizing the Limitless on Gojo's body, moving inch by inch towards his face.

"Interesting. You actually managed to neutralize my Limitless. But the technique's power is still a bit lacking."

Gojo slapped the Great Ball Rasengan away with one palm. Just as he was about to grab his hand, he shattered like a mirror again.

Returning to the "outside" of the domain, Tatsuro quickly distanced himself from Gojo's mirror reflection. He now felt that his ninjutsu was truly lacking. His strongest Rasengan couldn't even break through Gojo's Limitless. After all, he used to rely on his Susanoo to fight people. Now that he couldn't easily use Susanoo, he was at a disadvantage.

"Alright, you stay over there. I'm going to do a little experiment."

Gojo looked at the reforming "Tatsuro," slowly raised his right hand to form a seal, and said, "Domain Expansion: Unlimited Void."

Unlike Tatsuro's, a white domain began to rapidly expand, instantly enveloping the "replacement mirror body" left on the other side. Tatsuro, unable to see anything, knew he had lost completely in the domain battle!

However, he himself wasn't affected at all. After all, Gojo's reflection wouldn't cast a Domain Expansion. Watching the "Gojo" slowly approach, Tatsuro raised a hand in response, "I'm not affected by your domain, sensei. But my cursed energy has already bottomed out. Let's leave it at that."

"Alright."

Gojo deactivated his domain and praised him, "That's a very special domain. It really isn't easy to catch you."

"But the drawback is that I have too little cursed energy. After a short fight, I can only rely on taijutsu to brawl with the enemy."

Tatsuro scratched his head. The domain was dispelled. It was still due to his low cursed energy reserves. He had a total of 5250 cursed energy, and opening the domain cost four thousand! It had nearly drained him dry.

But in any case, he had taken his first step today. He also had to go make breakfast for that little one now. He wondered if using Sage Mode while casting Domain Expansion would be better. After all, inside the domain, he didn't have enough natural energy to activate Sage Mode. It was a bit of a headache.

But he had more or less figured out his own limits. He wouldn't suffer a huge loss in his next fight with Jogo. He had to use 'Mirror Shatter' to rip his head off!

Should he draw a more powerful ninjutsu?

The thought inadvertently surfaced in Tatsuro's mind, but he quickly extinguished it. He didn't have much cursed energy; even the most powerful ninjutsu would be useless to him.

He needed to get his cursed energy above six thousand before considering that. After all, he was still very far from the points needed for the Eternal Mangekyo Sharingan.

After a simple farewell to Gojo-sensei, he left immediately. It was 6:55 AM, approaching seven. On the training grounds, Maki and the others had already begun training Yuji Itadori and the others. Fushiguro Megumi should be practicing Sage Mode with Lady Katsuyu right now.

As for Yuji…

It was better not to teach him. That way, Ryomen Sukuna wouldn't beat him up like an idiot. Damn it, if he also learned Sage Mode, that would be terrifying!

In the future, he'd have to take a detour whenever he saw him…

Even Gojo-sensei would have to hesitate before facing him. After all, he would be the King of Curses who had learned Sage Mode!

Back at home.

"Little Luo is back."

"Good morning, Master."

"Yeah, I'm back."

He could see that Lady Katsuyu's body was half its size, and the sound of rushing water came from the bathroom. Shura was lying on the floor, gnawing on the meat that had been delivered yesterday afternoon.

Everything was as usual, and very peaceful. Tatsuro patted Shura's head and turned to walk into the kitchen. His mind began to mull over the idea of the 'Yin Seal'. It seemed to be an S-rank ninjutsu, its effect being to store chakra, which in this world would naturally become storing cursed energy.

Buying it would cost more than 200 points, but it felt like a worthwhile purchase. He could no longer use his eyes freely, and his cursed energy was pitifully low. In the future, facing Jogo, Geto, and the others, he couldn't afford to fight recklessly. It was better to buy it first.

He couldn't draw it before, and now that he had points, he was extremely hesitant whether to buy ninjutsu or spin the wheel. If he drew something useless, it would be a complete waste. He wasn't confident in his own luck.

If he spent over 200 points and got a series of S-rank ninjutsu fragments, he would die laughing. It was safer to just buy it. Even if it was a luxury, it was better than being a gambler. Gambling could easily send you to heaven.

Your soul to heaven...

The points had to be used wisely. Whether he could reign supreme in the future all depended on this Yin Seal.

Standing in the kitchen, Tatsuro opened his panel and searched for the S-rank ninjutsu, Yin Seal.

The moment he saw the ninjutsu, he couldn't help but be surprised. 250 points! He currently only had 280 points in his account.

Buying it would almost completely wipe out his points!

He had risked his life for these! But right now, it seemed there was no other choice besides buying it. He had already transitioned from a Susanoo-invincibility style to a Domain Expansion style.

His fighting style had completely changed.

For the sake of his own life, he bought the S-rank ninjutsu with a pained expression. A system notification immediately followed.

[Congratulations, Host, for purchasing the S-rank ninjutsu: Yin Seal. Points -250, remaining 30.]

[Congratulations, Host, for purchasing your first ninjutsu. Reward: Permanent increase of 50 Cursed Energy.]

[Yin Seal: A rhombus-shaped mark will appear on the forehead to store cursed energy. It is a sealing ninjutsu that seals excess cursed energy within the rhombus mark on the forehead. When needed, you can use "Yin Seal: Release" to make the stored cursed energy available for your own use.]

Seeing this, Tatsuro's furrowed brow finally relaxed. After all, you get what you pay for. Although he could no longer easily use Susanoo, Mirror World, or Mirror Shatter, he now possessed the Yin Seal, which was comparable to having infinite cursed energy.

Feeling a foreign object suddenly appear on his forehead, Tatsuro took out his phone to look. For some reason, a man having a dark purple rhombus on his forehead felt very awkward.

But he couldn't quite put his finger on why…

After injecting all his remaining cursed energy into the Yin Seal, Tatsuro's body was completely drained. He then set his sights on Shura at the door. After all, he had started raising him to be a punching bag and a backup cursed energy pack.

He said, "Deactivate Sage Mode, Shura. I'm taking some cursed energy, just a billion points' worth."

"Okay!"

Although he had been fed disgusting vegetables yesterday, Shura wasn't holding a grudge. He was the type to hold a grudge for a day and be back to normal after a night's sleep. Of course, he didn't dare to hold a grudge either, or the slipper would be served.

Tatsuro left Shura with only 10 points of cursed energy, siphoning off the rest and injecting it into his Yin Seal. What a delight.

Feeling his future was bright, Tatsuro began to happily make breakfast, his mind replaying how he would fight Jogo and Ryomen Sukuna next time.

After all, from now on, he was only going to get stronger and stronger!

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