The Greatest Assassin Gets Reincarnated in Tensura

The world had not stopped turning in Guy Crimson's absence.

Nations still rose and fell, conflicts still simmered, and the Demon Lords continued ruling over their territories, oblivious to the fact that one of their own had vanished.

No Walpurgis had been called. No summons had been sent.

To them, Guy was simply… quiet.

And in the grand scheme of things, his silence was just another ripple in the vast ocean of time.

But one man—one being—was watching from the shadows.

Far away, in a hidden chamber illuminated by ethereal blue flames, Arion sat upon his throne.

His expression was unreadable, his golden eyes flickering with thoughts only he understood.

He was remembering a conversation. One that had stayed with him.

A conversation with Chloe.

A discussion about Rimuru.

He could still hear her voice, calm yet firm.

"In the future, a soul unlike any other will be reincarnated in this world… in the Jura Forest, within a cavern where Veldorais sealed."

Arion's fingers tapped lightly against the armrest of his throne.

^^FlashBack^^

"A reincarnation?"

Chloe had nodded. "Yes. This will be his first time in this world. He will start as something small, something insignificant… but his fate will be vast. His existence will shape the future."

Arion had closed his eyes back then, letting the words settle.

^^FlashBack End^^

Now, as he sat alone in the flickering blue light, he smirked.

"So… it's still yet to happen."

His eyes turned toward the distance, piercing through time and space.

Somewhere, in a future moment waiting to unfold, Rimuru's soul would descend.

And when that happens…

Arion leaned forward, his voice calm yet absolute.

"Pandoria."

"Yes, my lord?"

"When the time comes, remind me to send Veldora to Jura Forest. Have him be there when the reincarnation takes place."

A pause.

Pandoria did not question him. She never did.

"Understood."

Arion's golden eyes flickered with amusement.

"Let's see what kind of existence this 'Rimuru' will become."

Meanwhile, across the world, the Demon Lords ruled as they always had.

Each watched over their own domains, handling internal conflicts, wars, and maintaining balance.

None of them had even realized that Guy Crimson had been erased from existence.

Luminous Valentine sat upon her grand throne in Ruberios, basking in the eternal night of her kingdom. She sipped from a glass of crimson liquid, deep in thought.

"Strange…" she murmured, her violet eyes narrowing. "The world has been oddly stable for some time. Too stable."

Her most trusted knight, Hinata Sakaguchi, stood beside her, arms crossed.

"Is that a bad thing?"

Luminous tapped her glass lightly.

"With Guy, there was always a presence. A looming force. Something that could shift at any moment. Now?" She exhaled softly. "It's almost… too quiet."

Hinata remained silent, but she too had noticed.

In El Dorado, Leon Cromwell stood at the balcony of his golden palace, gazing at the vast lands below.

His second-in-command, Claude, approached him.

"My lord, there has been no movement from the Ice Continent in years."

Leon didn't respond immediately. His piercing blue eyes remained locked on the horizon.

"Perhaps he is merely watching," Leon said finally. "Or perhaps he has grown tired of his games."

Claude bowed slightly. "Shall we investigate?"

Leon thought for a moment, then shook his head.

"Not yet. If Guy had truly disappeared, the world would have already noticed."

He didn't realize how wrong he was.

Even Milim Nava, usually chaotic and restless, had felt it.

Sitting atop the massive throne in her Dragon Kingdom, she pouted, legs dangling over the armrest.

Her dragon servant, Midray, stood beside her, amused by her expression.

"Bored?"

Milim sighed dramatically. "It's been too long since something fun happened!"

Midray chuckled. "Perhaps that's a good thing?"

Milim huffed. "Or maybe something is missing and no one's noticed yet."

She didn't realize just how right she was.

Guy Crimson had been gone for centuries.

But the world had never stopped.

The Demon Lords continued ruling, the balance was maintained, and no one questioned his absence.

But now—now he was back.

And soon, the world would remember his name.

They just didn't know it yet.

Days later.....

Guy Crimson sat upon his grand throne, carved from the very essence of frozen time itself. The Ice Continent had changed—less frigid, less alive.

The air lacked the presence of the one who had once made this place her domain.

Velzard was gone.

His piercing crimson eyes remained sharp as ever, but there was a shadow of something deeper within them.

Something he had not felt before.

Misery and Rain, his ever-loyal maids, stood before him, kneeling in silent reverence.

Guy tapped a finger on the armrest of his throne, his voice calm yet absolute.

"It's time to remind them."

Misery and Rain lifted their heads slightly.

"Shall we proceed, Lord Guy?" Misery asked, her voice composed.

Guy smirked. "Summon the Demon Lords."

There was a moment of stillness before his words echoed across the frozen halls.

Rain and Misery immediately bowed and, without hesitation, disappeared into the void.

The eternal night of Ruberios was as mesmerizing as ever, the grand cathedral standing in its timeless glory.

Inside, Luminous Valentine sat upon her extravagant throne, idly swirling a glass of deep crimson liquid.

Beside her, Hinata Sakaguchi stood in her knightly uniform, arms crossed.

"A Walpurgis? Now?" Hinata asked skeptically.

Luminous didn't answer immediately.

Her violet eyes shimmered as she looked into the dark expanse beyond her halls.

"For Guy to suddenly call one… something must have changed."

She tapped her long, delicate fingers against her glass before giving Rain a side glance.

"You look rather calm about this."

Rain, who had arrived mere moments ago, remained kneeling.

"Lord Guy has returned. That is all that matters."

Luminous exhaled softly and leaned back.

"Fine. Tell him I'll be there."

Rain bowed and vanished into the shadows.

Hinata narrowed her eyes. "Something doesn't feel right."

Luminous sipped from her glass and smirked. "That's what makes it exciting, doesn't it?"

A gust of wind swept across Leon Cromwell's balcony.

The golden city beneath him shimmered under the sun, a testament to his rule.

Claude, his ever-loyal knight, stood beside him, his stance unwavering.

And before them—Misery knelt.

"Lord Guy summons you to Walpurgis."**

Leon's expression was unreadable, but his sharp blue eyes flickered with interest.

"So, the arrogant bastard finally decided to show himself."

Misery didn't react, merely waiting.

Claude, however, frowned. "After all these years? Why now?"

Leon let out a soft chuckle. "There's only one way to find out." He turned, his cape billowing behind him. "Tell him I'll be there."

Misery nodded and disappeared into the void.

Claude sighed. "This is going to be troublesome."

Leon smirked. "It always is."

Deep within a massive labyrinth, Ramiris was sprawled across a pile of soft pillows, snoring loudly.

Her Fairy Guardians were bustling about, maintaining the labyrinth's mechanisms.

That was when Rain arrived.

The moment Ramiris sensed the sudden presence, her wings flapped in panic, and she shot up.

"Ahhh! An intruder—"

Rain sighed. "Lord Guy has called for Walpurgis."

Ramiris blinked. "Wait. What?"

Rain didn't bother repeating herself.

Ramiris stared, dumbfounded. "That guy's still alive?! I thought he vanished into some dark hole or something!"

Rain remained impassive. "You are expected to attend."

Ramiris puffed up her cheeks. "Tch! Just when things were peaceful…! Fine, fine, tell him I'm coming!"

Rain nodded and vanished.

Ramiris groaned. "Why do I have a bad feeling about this…?"

The winds were strong atop the Great Beast Throne, where Carrion stood.

Beside him, Frey descended gracefully, her golden wings catching the sunlight.

And before them—Misery stood.

Carrion narrowed his sharp lion-like eyes. "Walpurgis? Now?

Misery nodded once. "Lord Guy commands it."

Frey folded her arms. "He's been gone for ages. Why now?"

Misery remained silent.

Carrion exhaled, rubbing his temple. "Fine. We'll be there."

Misery vanished without a word.

Frey sighed. "I have a feeling this is going to be a mess."

Carrion smirked. "It's Guy Crimson. Of course, it's going to be a mess."

Inside the eerie halls of Clayman's castle, shadows twisted unnaturally, dancing in eerie patterns.

Clayman sat upon his throne, his fingers steepled, a sharp grin playing on his lips.

Before him—Rain knelt.

"Lord Guy summons you."

Clayman chuckled. "Oh? How delightful. I had begun to think he'd vanished forever!"

Rain said nothing.

Clayman stood, his elegant robes flowing as he descended his throne.

"Tell him I shall grace him with my presence."

Rain vanished into the void without another word.

Clayman's grin widened. "This will be… entertaining."

Deep within the vast mountainous stronghold, where the earth itself trembled beneath every step, Dragruel sat upon a throne carved from unshakable stone.

The massive Demon Lord, known as the Titan of Destruction, radiated an overwhelming presence.

His muscles, like mountains, rippled as he crushed a boulder in his hand absentmindedly.

The room was filled with the echoes of warriors training, their war cries resounding across the fortress walls.

And then—Misery arrived.

The moment she stepped into the throne chamber, all movement stopped.

Dragruel's eyes, like glowing embers, locked onto her.

A low rumble, like distant thunder, escaped from his throat. "…You."

Misery knelt. "Lord Guy summons you to Walpurgis."

A silence followed.

Dragruel leaned forward, resting his massive forearms on his knees.

"Guy? That bastard's still alive?" His voice was like an earthquake.

Misery remained silent, her face as unreadable as ever.

Dragruel let out a deep, booming laugh. "Hah! I thought he finally got himself killed!"

His laughter shook the fortress walls.

Then, his expression darkened.

"…What's he planning?"

Misery did not answer.

Dragruel exhaled through his nose, shaking his head.

"Tch. That damned troublemaker. Fine. I'll go."

He cracked his knuckles, the sound echoing like boulders smashing together.

"Let's see what Guy's been up to."

Misery nodded and vanished into the void.