I do not own Jujutsu Kaisen or any of the characters.
Concluded
Mahito exploded from the ground in front of Yuma, drilling a punch into his face and sent him exploding backward through several sandstone pillars. Shinji exploded forward, throwing a punch, only for Mahito to catch his fist, grinning wickedly, despite the blood coating his face and matting more than half of his hair.
"My turn," Mahito grinned, then kicked him.
"Looks like he's finally figured it out " Yuma said.
"Took him long enough," Shinji said.
"Your Domain is a two-way Domain," Mahito said. "It's not an guaranteed hit, let alone a guaranteed victory, it just allows for you to manifest both of you. But in the end, it's still a battle! But not one between a Jujutsu Sorcerer and a Curse! This is a battle between souls directly! Cursed Energy, Curse Techniques, they're all meaningless here! The strength of a Soul is what matters! And I've been working with souls since I was created!"
"Being able to manipulate a soul isn't what determines its strength," Shinji said.
"A soul's strength is its stubbornness, conviction, its dogged clinging to existence, and the sum total of all of its emotions," Yuma said. "Do you believe you soul, which is so easy to change the shape of, can withstand ours?"
"Let's see," Shinji said.
Then, both of them had shifted forms again. They were back to the blackhaired child in green and the Cursed Energy mass, but this time, Mahito was ready. He blocked Shinji's ooening punch, flipping over Yuma's tail, and smashed Shinji into the ground. Shinji flipped, landing on his feet and ducking aside from a punch before slamming his own into Mahito's gut. Mahito was lifted into the air, only for his body to reverse itself and his right arm to expand in time to knock Yuma's attempt to swat him aside. He flipped to the ground and exploded forward, flipping over Shinji and batting him aside before landing and ducking under Yuma's hand again, then slammed a punch into his head, hurling him away. Shinji reappeared behind Mahito, slamming a heel into the side of his head, and sent him bouncing and flipping away before appearing below him, kicking him into the air. The bandages around hia arms came loose before he hurled himself into the air, wrapping them around Mahito.
"Nice try!" Mahito grinned, spikes errupting from the bandages, but missed Shinji.
A second later, Yuma's hand exploded down on Mahito. A tail exploded back up from under him, throwing him into the air a second after he'd been crushed, and just as he was in the air, a massive beam of scarlet energy exploded into Mahito, sending him exploding along the ground for close to a mile. As he stopped, Shinji and Yuma both appeared over him, Shinji's kick and Yuma's punch exploding into hims hands, only for him to flip, slamming a kick into each and sending them both flying. Both flipped, landing on their feet as Mahito begsn to laugh. Then, both were gone. Mahito crouched, readying himself, only for their fists to explode into him without warning, both of them now in matching forms of the human in the green body suit, except that one was an adult and the other a child. Shinji's fist hit Mahito in the side of the gut, Yuma's hitting him in the side of the face, flipping him sideways before both spun, slamming a roundhouse kick into him and sending him exploding away from them. He flipped, landing on hia feet, only for Yuma's tails to explode up from the ground around him, all of them swatting downward at him. He crossed his arms over hia head, blocking the strike and struggling to hold it back, only for Shinji to slip between two of the tails, his fist exploding into Mahito and sending him bouncing out of the cage the tails had formed. As Mahito stood, however, Shinji sensed a new soul enter the Domain and spun, seeing Kasumi standing in the distance, looking around in confusion.
"Yuma, hold him off!" Shinji instructed.
Yuma nodded, exploding after Mahito as Shinji appeared in front of Kasumi.
"Shinji?" she asked. "You look...completely different, but..."
"You can still rscognize me," Shinji finished. "Welcome to my Innate Domain. Here, your body is your soul, so any damage is dealt directly to the soul, and your power is determined by the strength of your soul, not by your Cursed Energy."
Kasumi frowned in confusion, just as Yuma crashed to the ground beside them.
"Yuma, swap," Shinji said, Yuma shaking his head and snarling. Shinji slapped him in the back of the head. "Stop being shy."
Yuma deflated, then shifted into his old appearance, before he was a Curse. He looked a lot like Shinji, but slightly older and a little taller, and also had bright green eyes. As he turned to Kasumi, Shinji shifted into their shared Curse form, exploding across the distance to Mahito, whos arms became blades before they began to clash.
"Hello, Kasumi," Yuma said, voice slightly deeper than Shinji's, but sounding hesitant and soft. "It...It's nice to finally meet you."
"You, too," Kasumi smiled. "Can you tell me the specifics of this Domain? I want to help you and Shinji."
Yuma smiled and nodded, explaining as quickly but clearly as he could. Then, once he was done, he glanced at Shinji. "There might be another way I can help you, though Shinji wouldn't approve."
"How?" Kasumi asked.
"Since your whole body is your soul, while we're here, I can reshape your soul directly, though it'll hurt," Yuma explained.
"Define reshape," Kasumi asked.
"When I healed Junpei to undo Mahito's Idle Transfiguration," he paused, "when I un-transfigured Junpei the first time I met Mahito, I noticed what part of his brain had recently also been altered to give him the ability to wield Jujutsu Sorcery and to increase his Cursed Energy. I could do the same for you. As I said, it'll hurt, and I can't turn you into the new Yuta Okkotsu, but I can increase your Cursed Energy by between fifty and a hundred percent, and allow you to have your own Innate Technique."
Kasumi nodded, turning away from Yuma and pulling her hair out of the way, and he overlapped his hands ob the back of her head. Then, as Cursed Energy and Reversed Cursed Energy both surged into her head, her face immediately screwed up in pain. She clenched her teeth, fighting to keep silent before a groan of pain forced itself out of her mouth. Then, it was over. Yuma pulled his hands away just before Cursed Energy raced through Kasumi.
"What is...I know how to..." she trailed off, then looked to Yuma for an explanation.
"I used a combination of the same technique and also the laws of this Domain to teach you to know how to use it at base," Yuma said, just as Mahito drilled a kick into Shinji's head, sending him bouncing back to Yuma and Kasumi. "Right. Break time's over."
"About time," Shinji said, pushing himself up, then stopping. "What'd you do?"
"He helped," Kasumi said, focusing. "Eight-armed Demon Manifestation, Blades!"
Tiny, barely-visible threads made up of Cursed Energy swarmed to her arms, forming what looked like a pure white metal into a pair of vambraces and foot-long, double-edged blades extending past her hands. Shinji watched her for a moment before smirking shifting into his own normal form, complete with Yuma's Curse arm. Yuma smiled widely and shifted his own left arm into a matching one, both brothers forming the same type of blades, theirs a shiny silver metal.
"Let's finish this, shall we?" Shinji asked.
"Yeah," Yuma and Kasumi both nodded.
Mahito cackled excitedly, crossing his arms, both still blades, and all three of his opponents charged. Yuma reached him first, slashing as he passed, his blade sparking against one of Mahito's before Shinji passed on the other side, Mahito blocking his as well. Kasumi raced in from the side, slashing at his front as she passed, only for Mahito to block it, the force sending her stumbling off to the side. Mahito shot forward, but Shinji shot in from the side. Mahito twisted, blocking Shinji's blades, but was hurled away by the blow before Yuma slammed a kick into his side, hurling him.
"Focus, Kasumi," Shinji said. "Real world strength doesn't matter here!"
"Right!" Kasumi nodded, then thought, "I'm as strong here as I choose to be! And I refuse to drag Shinji and Yuma down!"
She sped up, racing across the ground with the brothers, and they began to streak past Mahito rapidly, changing the frequency, angle, and order rapidly, keeping him on the defense and constantly having to block their strikes. Mahito's gein grew, and when he finally countered at Shinji, Shinji ducked under his slash, pressing a palm to his abdomen.
"Replicated Technique!" Shinji roared. "Cero!"
The blasted exploded almost as soon as it fired, sending Mahito flying into the air, only for Yuma to appear over him.
"Replicated Technique!" Yuma ahouted. "Cero!"
The blast once again struck directly, and Mahito exploded back into the ground in front of Kasumi.
"Eight-armed Demon Manifestation!" Kadumi shouted, the blades bursting apart before an enormous Cursed Energy silhouette formed behind her, then solidified into a Shikigami. It stood a little more than double her height, and had four heavily muscled arms, eight eyes that were entirely black, dark grey skin, a pair of dark red pincers extending out of the sides of its gaping mouth, pointed fangs inside of its mouth, long, white hair falling behind it and in front of its pointed ear on the right side of its head, reaching to the bottom of its shoulder blades, its legs were digitigrade, had two clawed toes in front of each foot and one in the back, and were covered by a steel-black exoskeleton, and four equally black, exoskeleton-covered spider legs extended from a point on the small of its back, curling around its sides and over its ahoulders before ending in points.
"What is that?" Shinji frowned.
"A spider demon," Yuma said. "An Imaginary Special Grade Cursed Spirit. Or, at least, it would be if it wasn't her Cursed Technique."
The Shikigami roared, its two right fists exploding down on Mahito before its right foot stomped on Mahito, then flung him into the air. Instantly, the four spider legs stabbed upward, extending in a blur and driving themselves through Mahito's back. When they retracted, the Shikigami faded, and Kasumi began to breathe hard, drawing her sword. Then, two new arms separated from her own, threads once again spinning themselves into weapons, this time a pair of wakizashi, before she charged, Shinji and Yuma both doing the same. Mahito roared in rage, shoving himself up and extending his arms into blades, only for Shinji to appear behind him, pressing a bazooka to his back. Mahito's eyes went wide just before Shinji fired, the laser swallowing everything except Mahito's head this time. Almost instantly, the Domain around them began to fracture until it finally shattered. Shinji blinked, finding himself back in the real world, Mahito lying ahead of him and Kasumi stirring behind him.
"We did it!" Kasumi cheered as Shinji turned to her, throwing her arms around him in a hug.
Shinji grinned, hugging her back. "You did great!"
"Me?" Kasumi scoffed. "You two were awesome! You were the perfect tag team!"
Shinji smiled, then grabbed her and leapt to the side as Mahito's arm flashed past in a spike, barely missing, then retracted. "I'm impressed you can still use Idle Transfiguration."
"You...bas...tard!" Mahito panted, blood running down his chin and staining his shirt and pants. "It's not...over!"
Then, he compressed before expanding again, streaking backward down the tunnel toward Shibuya, Shinji noticing the Veil from before was gone.
"Should we go after him?" Kasumi asked.
"Yes, but you're not fighting," Shinji said. "You were instinctively using Cursed Energy to fight at the end, so you ended up burning a lot of energy. I can handle any fights we get into."
Kasumi nodded, and they started forward again, moving quickly.
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