It is possible.
This isn't even a black sea, but has a solid theoretical foundation: an Innate Domain.
This is a concept first proposed by Ryomen Sukuna in the manga, representing the deepest part of a person's spirit. At that time, Ryomen Sukuna only existed as a cursed object, yet he could still manifest an Innate Domain and even invade Itadori Yuji's spiritual world.
Ordinary Tsukumogami certainly cannot possess an Innate Domain, but Mahito's Idle Transfiguration can subvert this concept.
It wasn't as difficult as imagined. In fact, he had already touched upon this point when he created the second-generation Intelligent Cursed Spirits during his Soul modification experiments.
Now, although limited to the spiritual realm, mirokuji kirigiri is truly alive. She possesses spirituality equal to a human and can use Cursed Techniques autonomously.
This also enables her to use Black Flash.
A wisp of black flame rose from kirigiri's hilt, and at the same moment, black flames also ignited from the tip of kirigiri's blade.
The world had never seen a true Fusion Black Flash before. Because Black Flash itself is a matter of resonance between a sorcerer's physical attack and Cursed Energy attack, no matter how much their hearts are in sync, the most they could achieve was the scene where Itadori Yuji and Todo Aoi used Black Flash together in the original work—a magnificent sight not seen in a century.
But now, at this very moment, the first instance of Fusion Black Flash in the history of the Jujutsu World appeared. The Tsukumogami and its user were of one mind, their Cursed Energy linked, triggering Black Flash simultaneously!
Suddenly, Mahito paused.
His Simple Domain had shrunk to a radius of 2.25 meters, the most standard Simple Domain. Within Yuki Tsukumo's Domain Expansion, a Simple Domain clearly had to withstand immense pressure, making its structure very unstable. Yet now, at this moment, the structure of the Simple Domain was incredibly smooth, blending silently into the world.
Mahito used the most primitive Simple Domain.
In that era a thousand years ago, to deal with Domain Expansions that ordinary Jujutsu Sorcerers could never reach, the Simple Domain created by Ashiya Magon became their only choice. Under this premise, the core philosophy of the Shinin Style founded by Ashiya Magon was widely known:
—When there is no other choice, charge forward with total devotion!
And now Mahito personally changed this philosophy, overlaying it with his own. He said to himself:
—With a mind free of distractions, one can transcend the mundane and enter the divine.
The Simulated Black Hole in the sky was finally thrown down by Yuki Tsukumo.
The entire Domain Expansion: Sumeru Vajra Karma Wheel bowed before this mass and density that transcended common sense. Yuki Tsukumo shouldn't have been able to use this ability, because the pressure was so great that even a Domain Expansion couldn't hold it.
But she couldn't bring herself not to use it.
If it was for a hearty battle with Mahito, she had to use it!
She also firmly believed that Mahito would not dodge.
He would face it, he would transcend it, he would achieve a breakthrough.
If he couldn't, then he would die.
—Come, Mahito. Let me witness here whether you fall or transcend!
The gravitational ripples of the earth finally couldn't withstand the immense pressure. Countless mysterious black thin lines rose like a rainstorm falling upward from the ground toward the sky. The final destination of this rainstorm was the Simulated Black Hole, and this huge pressure forced the entire barrier to decompose.
Mahito took a deep breath and gripped the hilt of his sword with his right hand.
He closed his eyes.
Even as the sky-toppling pressure was slowly descending, his heart felt as if ages had passed in an instant. His breathing and cursed energy core vibrated together, and the kirigiri in his hand vibrated with them.
But this was not a physical vibration; a certain spiritual quickening was forming.
Breath, Cursed Energy, kirigiri.
Resonance.
Mahito swung kirigiri.
Clearly, before the swing, black flames had enveloped Mahito's entire body, but at the moment of the swing, all the black flames extinguished. The flow of Cursed Energy was entirely concentrated on kirigiri's blade, and a faint black light covered the edge.
—Divine Sword Mukū Kūshiki.
The Divine Sword is a legendary swordsmanship recorded in the real-world swordsmanship catalog of the Shinin Style. The book states that this sword connects to the divine. "Immaculate" represents absolute purity, and "Void Consciousness" represents a state of no-thought and no-mind.
Divine Sword Mukū Kūshiki is a divine strike swung down from the state of selflessness.
This slash transcends time, penetrates the mortal world, passes over three thousand crows, and dictates life and death.
—It can even slay gods!
An unprecedented Fusion Black Flash detached from kirigiri's blade.
The intense spatial distortion now converged into a black slash.
The Simulated Black Hole appeared as a pitch-black void.
Suddenly, all pressure vanished.
The decomposing Domain, the fanatical Yuki Tsukumo, and the swinging Mahito all stood still.
At the very center of the Simulated Black Hole, a flash of sword light sliced through.
Yuki Tsukumo still maintained the posture of throwing the Simulated Black Hole. She slowly lowered her head.
She was wearing a black tank top that exposed her navel, and right now, on her navel, a diagonal bloody gash had appeared unknowingly. If not for the sudden interruption of her Cursed Energy, Yuki Tsukumo wouldn't even have noticed this wound.
"I see," Yuki Tsukumo smiled. "It's my loss, then."
The massive Simulated Black Hole began to shrink.
Once the immense density started, it could not be stopped. But before the Simulated Black Hole could continue forming, the sword light had already cut it in half.
However, this still didn't stop the gravity of the huge mass; all matter within the Domain was being compressed, attracted, and finally crushed.
But this power could never expand to its maximum.
As Yuki Tsukumo's Cursed Energy was cut off, the Fusion Black Flash released a space-distorting slash that shattered the Simulated Black Hole, and the entire barrier was forced to break.
The dark red cosmic space began to evaporate like fragments. A bright sun appeared from the ceiling of the shattered Domain Expansion.
Mahito slowly sheathed his sword.
He stood up straight and began to walk forward.
As he advanced, the barrier of the Domain Expansion vanished like a dream, revealing the original desert.
Yuki Tsukumo took two steps forward and suddenly knelt on the ground.
Her Shikigami fell to the floor.
The slash had hit her abdomen exactly where the cursed energy core was located. A Jujutsu Sorcerer's cursed energy core is the organ used to extract Cursed Energy. Once destroyed, she could no longer extract Cursed Energy.
But if it were just that, it wouldn't matter, because the use of the Reverse Cursed Technique relies on the brain. As long as the brain wasn't destroyed, Yuki Tsukumo would still have the ability to use the Reverse Cursed Technique to revive herself.
But as it happened, she had just exhausted all her efforts to pour out every bit of Cursed Energy to create the Simulated Black Hole. At this moment, not a single trace of Cursed Energy was flowing within her body.
With her cursed energy core destroyed, she couldn't extract Cursed Energy, and she didn't even have the chance to use the Reverse Cursed Technique.
Mahito walked up to her and looked down at her.
"Well done, Mahito," Yuki Tsukumo praised softly. "You truly practiced the ancient way, using a Simple Domain to break through my Domain Expansion head-on."
A huge spray of blood suddenly bloomed from Yuki Tsukumo's abdomen.
Her upper and lower body began to separate slowly. Her upper body fell onto the desert, while her lower body remained in a kneeling position, motionless.
Blood soaked a patch of the desert, like ink dropped into calm water.
Yuki Tsukumo is... dead?
Mahito reached out and gently stroked mirokuji kirigiri. Using his Construction Technique, he built a scabbard that fit her perfectly.
The long sword entered the scabbard with a crisp sound.
Then, maintaining this posture, he stood the sheathed kirigiri between himself and Yuki Tsukumo's corpse.
He had already used Black Flash twice in a row, one of which was a Fusion Black Flash with kirigiri. His state had surpassed its limits.
If it was now, at this very moment, he could easily do it.
He sighed softly:
"Domain Expansion—"
He formed hand seals.
Though it was a soft sigh, it sounded like the tolling of a twilight bell:
"—Dharma Realm Reincarnation Nirvana Realm."
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