Domain expansion . 領域展開

"This is your final lesson, Ryomen Sukuna,"

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Inside the abyss of her consciousness, Naomi's vision flickered between the world outside and the suffocating darkness within. She was trapped, floating in an endless void where Sukuna's presence loomed over her like an unshakable shadow. She could feel his grip tightening, consuming her, pushing her further and further into nothingness.

But then—she saw him.

Her brother. He is alive.

Gojo Satoru, standing amidst the battlefield, his stance firm, his expression unreadable beneath the blood and exhaustion. His Six Eyes gleamed with an intensity that could have turned the tides of battle in an instant, and yet—he held back. His movements, the way he dodged and countered without truly striking, spoke louder than any words ever could.

He wasn't fighting her. He was fighting for her.

A realization crashed into Naomi like a tidal wave.

Gojo, the strongest sorcerer alive, the man who could tear apart reality itself, wasn't unleashing his full strength because he didn't see an enemy before him. He wasn't holding back out of arrogance or strategy. He was doing it because she was still in there. Because to him, she wasn't Sukuna. She wasn't a threat to be eliminated.

She was his sister. Tears burned at the edges of her mind, a choked sob clawing at her throat.

Nii-chan...

She had spent her whole life watching him from afar, convinced that she would never truly understand the weight he carried. That he was too strong, too untouchable, too far above her. And yet, right now—he was choosing her over the world.

He wasn't willing to let go. Even if it killed him.

Naomi's vision blurred, the battlefield fading in and out. She saw Megumi, his fists clenched, his attacks growing sharper, faster. She saw Yuji, Yuta, Maki—all of them—fighting with everything they had, pushing themselves past their limits just to reach her.

They weren't giving up. So how could she?

A spark ignited in her chest, faint but unwavering. She wouldn't let them fight alone. She wouldn't let him fight alone.

With every ounce of will left in her, Naomi reached out—toward the light.

Inside the depths of her consciousness, Naomi felt as if she was drowning. She was trapped in an ocean of darkness, with Sukuna's presence pressing down on her, suffocating her like chains wrapped around her soul. She could feel her body moving against her will, her limbs striking out with devastating force, her voice tainted by his malicious laughter. Yet, she could do nothing to stop it.

Outside, she could see it all.

Gojo stood before her, battle-worn yet unwavering, his gaze locked onto her with something deeper than just strategy. It wasn't caution or fear—it was love. It was belief. He refused to see her as the enemy.

He wasn't fighting to kill. He was fighting to save.

She saw the way he dodged her attacks, never once retaliating with lethal intent. He blocked, countered, even struck her with carefully measured blows meant to restrain, never to harm. He wasn't using his full strength.

Why?

Didn't he understand? Didn't he see that it was her body, but not her? That it was Sukuna he needed to fight, not his little sister?

Around them, the battlefield was chaos. Megumi fought relentlessly, his face torn between pain and determination as he refused to let Sukuna use his body to hurt anyone else. Yuta and Yuji fought with everything they had, pushing past their limits, trying to find an opening, a weakness—anything that could bring Naomi back. Maki, bloodied and battered, stood ready to strike, yet her hands wavered ever so slightly.

They were all hesitating. Because it was her.

Naomi's heart shattered. She could feel Sukuna's pleasure at their hesitation, his enjoyment at how easily he could toy with their emotions. He laughed inside her mind, taunting her, mocking their weakness.

"Look at them. So desperate. So pathetic. They can't even bring themselves to fight me properly. This is why they'll all fall—because they are weak."

"And you—" his voice slithered through her thoughts like venom, "—are the weakest of them all."

She clenched her fists.

No. No, she wasn't.

She had spent her life being protected, watching from the sidelines, thinking she could never stand beside them. But now, she had the power to do something. And she would. Naomi forced herself forward, deeper into the abyss of her own soul, pushing against Sukuna's suffocating grasp. She didn't fight for control—she knew it was futile. Instead, she reached for the only thing she could.

"Nii-chan."

Gojo's breath hitched in the real world, his eyes widening for the briefest moment.

"Nii-chan, please." Her voice trembled, raw with desperation. "You have to fight me properly. No matter what."

He faltered.

"Even if it means killing me."

She felt his entire body tense at those words. She could feel his heart crack, his hesitation deepening.

"I know you don't want to hurt me." Her voice was barely a whisper, yet it echoed through both their souls. "But if you don't... if you keep holding back... Sukuna will win. And then it won't just be me."

Outside, Sukuna—wearing her face, her voice—smirked as he sent another devastating attack toward Gojo. He barely managed to deflect it, the force of it sending him skidding backward. He was fast, but Sukuna was getting faster. Stronger. Naomi watched as her brother's fingers curled into tight fists. His breath was ragged, his expression unreadable beneath the weight of everything he carried.

"I believe in you," she whispered, tears slipping from the corners of her eyes in the darkness. "But you have to believe in me too. Trust me, Nii-chan. Even if you have to kill me... I'll come back. I promise."

Gojo stood still for a long moment, staring at the girl who wore his sister's face, yet was no longer her. His hands trembled for just a second. Then, slowly—his fingers closed. And when he lifted his head, his eyes were no longer filled with hesitation.

Naomi let out a breath of relief. He understood. He was ready. And so was she.

 Naomi stood before the Buried Sun, her reflection shimmering with untapped power. She finally understood—understood why this presence had always remained caged within her, why it had waited. It wasn't just her strength. It was her truth. And now, she would set it free.

Her body was no longer her own, but her soul—her will—was still hers. And if she couldn't take it back, she would burn everything down from within. She would rip Sukuna apart piece by piece, drown his existence in light, and ensure that when the final moment came, she would drag him into oblivion with her.

This was how it would end. Not with hesitation. Not with fear.

But with her choice.

Sukuna chuckled darkly, his voice slithering through the void of Naomi's soul like a serpent coiling around its prey. His smirk was taunting, his eyes glinting with amusement as he watched her struggle.

"You really think you have a choice here?" he mused, tilting his head. "How adorable. I've already taken everything from you—your body, your strength, your freedom. And yet, you still believe you can end me?" He let out a low, cruel laugh. "You are nothing but a flickering flame in the palm of my hand, girl. No matter how bright you burn, I will always be the one to snuff you out."

Naomi's fingers curled into fists as she glared at him, but Sukuna only grinned wider. He could see her anger, her desperation. He fed on it.

"You should be grateful," he continued, his tone mocking. "I could have erased you the moment I took over, yet I let you watch. Watch as I use your hands to destroy the people you love, as I turn your precious world into dust. And when there's nothing left, when you're broken beyond repair, you will beg me to end it."

He leaned in closer, his voice a whisper against her ear.

"And I will—but not before I make you see what true despair looks like."

Naomi stood before Sukuna, the storm of battle raging around them.  Her body was no longer hers, not entirely. Sukuna had taken her, claimed her, but she had not surrendered. She never would.

Sukuna smirked, arms crossed as if this were all an amusement to him. "Look at you," he drawled. "Even now, you hesitate. You're weak, Naomi. You should be thanking me. I've given you power beyond your wildest dreams."

Naomi breathed in, steady. "Power? Is that all you ever wanted?"

Sukuna tilted his head, his smirk widening. "Of course. Power is everything. Power decides who lives and who dies. Power is the only thing worth having."

Naomi stared at him for a long moment, then shook her head. "That's why you'll never understand."

Sukuna laughed, a sharp, cruel sound. "Oh? And what is it that I don't understand, little girl?"

She took a step closer, standing firm despite the weight of exhaustion pressing against her. "Love."

His smirk faltered, just for a fraction of a second. "Love?" He scoffed. "Don't make me laugh."

But Naomi didn't look away. She held his gaze, unshaken. This was it—the moment before the end. The reason why she let Sukuna take over her body.

"Love isn't weakness, Sukuna," she said, voice unwavering. "Love isn't just soft words and fleeting emotions. Love is choosing to stay, even when it hurts. Love is fighting, even when you know you'll lose. Love is the reason people keep standing, even when they're broken."

She clenched her fists. "Love is why my brother fought for his students. Love is why Yuji still stands. Why Megumi still fights. Why I am still here. It's not about power. It's about what you do with it."

Sukuna's eyes darkened. "And what has love ever done for you? It's only brought you suffering."

Naomi gave him a small, sad smile. "Yes. And yet, I'd choose it again. Every time."

The air around them shifted. The sky above trembled. Naomi exhaled, her breath slow and steady.

"I loved my brother." The ground cracked beneath her.

"I loved my friends." The wind howled.

"I loved Megumi." The sun overhead burned hotter, brighter.

The battlefield was silent. The chaos of war faded into the distance, as if the world itself held its breath for what was to come. Naomi stood before Sukuna, her body battered, her soul wavering, but her resolve unshaken. She had made her decision. But before she brought an end to him—to herself—she had something left to say.

Sukuna watched her with a smirk, his crimson eyes gleaming with intrigue. "You talk as if your words mean anything to me," he said. "As if I would ever care about the things you cherish."

Naomi exhaled softly, her fingers curling into fists at her sides. "You say that, but I think you do care," she murmured. "Somewhere, deep down, you do."

Sukuna chuckled, a low, bitter sound. "I don't. I never have."

Naomi lifted her gaze to him, searching for something beyond the monster he had become. "Then why did you admire Yorozu's devotion, even when you mocked her? Why did you acknowledge those who challenged you, even when you crushed them?" Her voice was quiet, but it held a power stronger than any technique. "Why do you look at me now, not with indifference, but with expectation?"

Sukuna's smirk faltered for just a moment.

Naomi took a step closer. "You were human once, weren't you?" she asked, her voice gentler now. "You lived, you breathed, you felt. But somewhere along the way, you decided that life had nothing to offer you." She tilted her head slightly, as if truly trying to understand him. "Why?"

Sukuna scoffed. "Life is fleeting. It is weak. The strong devour the weak, and I refused to be prey." His voice was sharp, filled with an ancient bitterness. "Love, compassion, kindness—they are shackles. They make people vulnerable. They make people die."

Naomi looked at him with something almost like sorrow. "So that's why you chose power," she whispered. "Because it was the only thing that could never betray you."

Sukuna's gaze darkened.

Naomi's eyes softened. "But you're wrong, Sukuna."

He let out a cold laugh. "And what would a foolish girl like you know?"

She smiled, but there was sadness in it. "Because I loved someone," she said, her voice unwavering. "I loved my best friend. I loved my brother. I loved Megumi." She took another step forward. "And I lost them. I lost all of them. It hurt more than anything. It shattered me."

Sukuna watched her silently.

"But," Naomi continued, her voice growing stronger, "that pain—that grief—means they were real. It means they mattered. Love doesn't make you weak, Sukuna. It makes you stronger than anything. Because love is what gives life meaning."

Sukuna's expression didn't change, but something in his posture shifted. Almost imperceptibly.

Naomi's lips trembled, but she forced herself to keep going. "You've spent centuries trying to prove that power is the only truth," she said. "That nothing else matters. But tell me, Sukuna—when all of this is over, when everyone is gone, when there is no one left to fight, no one left to fear you... what will you have left?"

Silence.

Naomi took one last step forward, standing right before him. "Nothing," she whispered. "You will have nothing."

Sukuna's smirk returned, but it was hollow. "I don't need anything else."

Naomi looked at him for a long moment. Then she shook her head. "I pity you."

Sukuna's smirk froze.

Naomi exhaled and looked up at the sky, at the dying sun above them. "That's why... I won't let this continue."

Outside the battlefield, the world held its breath. The warriors, bruised and exhausted, stood still as they watched Sukuna stagger. His body tensed, his fingers twitching as if resisting some unseen force.

Yuta wiped the blood from his lip, his breath ragged. "Something's happening," he muttered, his sharp eyes narrowing as he observed Sukuna's movements.

Maki adjusted her grip on her weapon. "He's... struggling."

For the first time since the battle began, there was a shift—small, but undeniable. Sukuna, the unstoppable King of Curses, was faltering. His attacks were slowing, his stance unsteady. He was fighting something.

Or rather, someone.

Gojo felt his pulse quicken, his icy blue eyes widening ever so slightly. He knew this sight all too well—the internal war between host and parasite.

A slow, almost disbelieving grin crept onto his face. "That idiot..." he murmured, his voice barely above a whisper.

Megumi's fists clenched at his sides. He could feel it too—Naomi's presence, burning inside that cursed body, pushing back with everything she had. She was still in there. She was still fighting.

"She's not giving up," Yuji said, his voice shaking, but there was something bright in his eyes. "She's actually fighting back."

Gojo exhaled a quiet chuckle. His exhaustion, the pain, the burden of failure—it all felt a little lighter now. "Of course, she is." His lips curled into a smirk, filled with undeniable pride. "She's my sister, after all."

For the first time since the battle had begun, hope flickered back to life.

Darkness stretched endlessly around her. It was cold, yet it burned. Heavy, yet weightless. Naomi stood in the vast abyss of her own soul, her bare feet touching nothing yet feeling the weight of something ancient pressing down on her.

And in front of her, standing like a god forgotten by time, the Buried Sun.

It was not human. It never had been. It was fire and shadow, destruction and rebirth—a force of nature, chained for eternity within Naomi's soul. It did not speak. It did not move. It simply watched her with hollow, burning eyes, waiting.

Naomi's breaths were shallow. Her body trembled, but it was not fear that made her weak. It was acceptance.

She took a slow step forward, the weight of her decision pressing against her ribs like an iron vice. "I understand now," she whispered, her voice breaking. "I finally understand why you were buried."

The Buried Sun flickered, its flames twisting unnaturally.

"You were locked away because no one could control you," she continued, her hands clenching into fists at her sides. "Because you burn everything. Because you consume everything." She lifted her gaze, determination shining through her tears. "But that's exactly what I need you to do."

The Buried Sun loomed closer.

Naomi exhaled shakily, her heartbeat pounding in her ears. This was the only way. Sukuna was too strong, too deeply embedded within her body. She had fought. She had resisted. But now, she understood—there was no victory unless she was willing to lose herself.

"I'll give you what you want," she said, her voice steady despite the storm inside her. "My body. My soul. My everything."

The flames flared violently, licking at her skin without burning.

"But in return," she continued, stepping closer, "you end this." Her voice hardened, stronger than ever. "You burn Sukuna from the inside out. You reduce him to nothing. You end this nightmare."

For the first time, the Buried Sun moved.

It reached out, its fiery hand hovering just above Naomi's chest, its heat sinking into her bones. It did not speak, but she felt its question.

'Are you sure?'

Naomi swallowed back the fear clawing at her throat. She was afraid of dying. But more than that, she was afraid of losing everyone she loved to Sukuna's madness. She was afraid of seeing Megumi's lifeless body. Afraid of watching Gojo fall again. Afraid of a world where Yuji, Yuta, Maki—everyone—was gone.

And so, she nodded. Yes.

The Buried Sun smiled.

And then, the world erupted in flames.

Sukuna exhaled sharply as the world around him shifted. Gone was the dark abyss of Naomi's soul. Gone was the frail girl who had resisted him, fought him, pleaded for her life while he toyed with her existence.

Instead, standing before him, was something else entirely.

A figure loomed in the nothingness—taller, grander, terrifyingly divine. It was human in shape but nothing like a human at all. Wreathed in flames, adorned in swirling torrents of wind, water, and ice, it pulsed with power that sent cracks through the fabric of this realm. The flames weren't just heat; they were rage, grief, eternity. The winds weren't just air; they were whispers of the lost.

And its eyes.

They were not Naomi's.

They were the Buried Sun's.

Sukuna's grin faltered for the first time in centuries. He was a King. He was a God. And yet, before this being, something deep inside him shifted. "You," he muttered, taking a step forward, his voice laced with something between amusement and unease. "You are what she offered herself to?"

The Buried Sun did not answer immediately. It merely tilted its head, watching him with something unreadable.

Sukuna scoffed. "And here I thought the girl had a will of steel. To surrender herself so easily? Pathetic."

A gust of scorching wind howled around them, embers flaring in the nothingness. The Buried Sun smiled.

"She did not surrender," it finally spoke, its voice layered—Naomi's voice beneath it, haunting, echoing, alive. "She chose."

Sukuna's smirk returned, but there was something sharp in his eyes. "Chose to throw her life away for nothing?" He chuckled, shaking his head. "Foolish girl."

The Buried Sun took a step forward, the weight of its presence pressing into Sukuna's bones. "She understood something you never did."

"Oh?" Sukuna's fingers twitched, itching for a fight, but he held back. He wanted to hear this. He wanted to understand why this girl, of all people, had become his greatest obstacle.

"She understood that strength isn't just power," the Buried Sun said, its voice burning through him like a whisper of the cosmos. "Strength is sacrifice."

Sukuna sneered. "Sacrifice is for the weak."

The Buried Sun chuckled—a sound like crackling embers and the hush of dying wind. "Is that so, King of Curses?"

Sukuna clenched his jaw. "A king does not sacrifice. A king takes."

"Then what did you take, Ryomen Sukuna?"

The words slashed through him.

Sukuna narrowed his eyes. "Everything."

The Buried Sun hummed, taking another step closer. "Then why do you look so empty?"

For the first time, Sukuna did not have an immediate response.

The world burned around them, but the Buried Sun stood unshaken, its presence unyielding.

Naomi's voice whispered beneath it. "This ends now."

Sukuna's fists tightened. And for the first time, he felt something dangerously close to doubt.

Sukuna's fingers twitched, his stance tensing as he stared at the entity before him. The Buried Sun stood unmoving, radiating a force unlike anything he had ever faced. It wasn't just power—it was resolve.

His grin flickered. "Empty?" he echoed, scoffing. "You think a king can be empty?"

The Buried Sun did not waver. "A king who rules only for himself is already a corpse," it murmured, the weight of its voice pressing down on him. "You have spent centuries taking, killing, destroying—yet look at you."

Sukuna clicked his tongue, eyes narrowing.

"You laugh in the face of death because you have never known what it is to truly live," the Buried Sun continued. "To love. To fight for something beyond yourself."

"Love?" Sukuna spat the word like poison. "You fools always speak of love, as if it's anything more than a weakness."

The Buried Sun's eyes burned like twin stars. "Love is why you will lose."

Sukuna's smirk returned, sharp as a blade. "Love is why people beg for their lives on their knees," he countered. "It is why they hesitate, why they fall. You think it makes you strong?"

The Buried Sun took another step forward, the space around them cracking, shifting, twisting under its presence. "Yes."

Sukuna's fingers curled into fists, his grin widening, but there was something off in his eyes.

"Naomi loved her brother. Loved her friends. Even loved you enough to try and make you understand," the Buried Sun said, its voice rippling through the void. "She gave herself to me—not out of surrender, but so she could end this. Because love is not just kindness. Love is destruction, too."

Sukuna's breath stilled for half a second.

Then he chuckled darkly, shoulders shaking with amusement. "Tch. You're just like her," he muttered. "Naomi, Gojo, Yuji... all of you, so desperate to cling to something fragile."

The Buried Sun tilted its head. "And yet, here you are," it whispered. "Standing in my domain, moments away from falling."

The air cracked. Flames roared. The void shook.

Sukuna's grin faltered for the briefest moment before his eyes sharpened. He took a single step back—an instinct, nothing more.

The Buried Sun raised its hand, fingers spreading as the space around them collapsed into blinding gold and crimson.

Sukuna's heart pounded against his ribs.

"This is your final lesson, Ryomen Sukuna," the Buried Sun declared, its voice no longer layered—it was Naomi's now, clear and powerful. Alive.

Sukuna's fingers twitched. He could feel it. The shift. The inevitable.

Naomi's voice rang through the void.

"Domain Expansion—Infernal Elegy"

The battlefield stilled.

Everyone—Gojo, Yuji, Yuta, Maki, and the others—froze as a sudden shift in cursed energy sent ripples through the air. It wasn't just powerful—it was suffocating. Before anyone could react, a vast golden and crimson sphere expanded, swallowing Sukuna alone. The domain's edges gleamed like a dying sun, its energy pulsing with the weight of something ancient, something divine. 

Unlike any domain they had seen before, it didn't stretch wide to cover multiple fighters—it formed perfectly around Sukuna, isolating him.

Hakari's eyes widened. "A... domain?" he muttered, barely above a whisper. "But from where?"

Yuji took a step forward, his breath hitching. "That's not Sukuna's domain..." His voice trembled. "It's—"

Yuta's grip on his katana tightened. "Naomi." The realization crashed over them like a tidal wave.

"How?!" Maki snapped, scanning the edges of the battlefield. "She—Sukuna took over her body! There's no way she could have—"

"No." Gojo's voice cut through, sharp but quiet. His Six Eyes flickered, analyzing the domain's structure. His expression darkened.

"She gave herself up," he murmured, something unreadable in his tone. "She let herself be consumed—so she could trap him inside." Yuji's fists clenched. "She's still in there."

The golden and crimson walls of the domain shimmered, shifting like fire and collapsing stars. It was like watching the birth of something new, something unnatural in its beauty and devastation.

The cursed energy pouring from it was Naomi's. But at the same time—it wasn't just hers. A cold shiver ran down Megumi's spine. This wasn't only Naomi's fight anymore. This was something else. Something deeper.

And inside that domain, Sukuna was facing it alone.

finally the domain expanison, the story's slowly coming to an end.anyways pls do vote and comment.