The Greatest Assassin Gets Reincarnated in Tensura

Unknown to All – Arion's Eyes in the Shadows

Hidden within the unseen corners of existence, where not even Demon Lords could perceive them, Arion's spies watched.

Their very presence was like whispers in the wind, shadows without form, invisible phantoms.

They observed as one by one, the Demon Lords arrived.

With silent movements, they relayed their findings to Arion, the unseen ruler, the unknown force behind the world's greatest mysteries.

And Arion, in his infinite patience, gave but a single command:

"Observe. Report. Do not interfere… for now."

And so, the spies stood by—watching as the monarchs of destruction converged.

One by One – The Demon Lords Arrive

First Arrival – Luminous Valentine, the Hidden Queen

A cold mist entered the hall before she did, bringing with it a chilling aura of mystery and deception.

The grand doors eased open, and in walked a regal figure—Gunther, dressed in fine noble attire.

Behind him, a silver-haired woman in a perfectly fitted maid uniform walked with the grace of royalty.

Her piercing scarlet eyes scanned the room with amusement, but she said nothing.

Gunther took his place, exuding an aura of command, while the "maid" simply stood at his side, her hands folded, an obedient servant—or so they all thought.

For centuries, Luminous had mastered deception.

Few among the Demon Lords knew the truth—that she was the real ruler, and Gunther merely a puppet to fool the others.

Her eyes momentarily flickered toward Guy before she smiled faintly and lowered her gaze.

The game had begun.

Second Arrival – Milim Nava, the Destroyer

The moment was shattered by a booming crash.

The great doors flew open as if they had been kicked—because they had.

"GUY!!!"

A pink-haired blur shot across the room, landing in front of Guy with a massive grin.

The floor beneath her cracked slightly from the force of her arrival.

Milim Nava, the childish yet terrifyingly powerful Demon Lord, stood with her hands on her hips, her golden eyes gleaming with excitement.

"So, you finally crawled back from whatever hole you fell into, huh?!"

She punched Guy playfully on the arm—except that "playful" hit was strong enough to create a shockwave that rattled the chairs.

Guy smirked, rubbing his arm. "Miss me?"

Milim grinned, showing her fangs. "You bet I did! Now spill it! Where the hell have you been?!"

But before she could pester him further…

A golden shimmer danced into the room.

A tiny figure zipped through the air, heading straight toward Guy like a speeding bullet.

"YOU'VE GOT A LOT OF EXPLAINING TO DO, CRIMSON!!!"

The pint-sized Demon Lord, Ramiris, flew right into Guy's face, her wings buzzing furiously.

Her tiny hands poked at his forehead aggressively.

"I thought you DIED! Do you know how much trouble that caused?! Do you?! I almost declared myself Queen of Walpurgis!"

The room fell silent.

Everyone stared at Ramiris.

Guy raised an eyebrow. "…You?"

Ramiris flinched. "Uh—okay, maybe not! But still! Where were you?!"

Before she could continue her interrogation…

A low growl filled the air as the next Demon Lord stepped into the hall.

A towering figure, clad in fur-lined armor, his golden eyes sharp like a predator stalking its prey.

Carrion, the Beast King, walked in with a steady, powerful stride.

His presence was commanding, his wild mane flowing like a lion prepared for battle.

His eyes swept across the room before locking onto Guy.

"Hmph. You sure know how to make an entrance, Guy."

There was no hostility in his voice—just expectation.

He took his seat, leaning back, his arms crossed as he observed the gathering.

A gust of wind swept through the hall.

Then—a pair of elegant wings cast a shadow upon the floor.

Descending gracefully, Frey, the ruler of the skies, touched down, her radiant orange eyes gleaming.

She was dressed in an ornate battle dress, her golden ornaments glistening under the dim light.

With her usual air of composed authority, she walked forward, her sharp gaze scanning the room.

Her eyes met Guy's, and she sighed.

"You certainly know how to disappear, Guy. And just when things were getting stable."

She took her seat, her presence both regal and commanding.

The air in the hall grew heavier, filled with an unspoken tension.

The next arrival was different.

A sinister energy slithered into the room before its owner even stepped inside.

Then—a slow, deliberate set of footsteps echoed.

A man clad in pristine white attire, a faint smirk playing on his lips, entered.

Clayman.

His eyes, calculating and cold, flickered between the other Demon Lords before settling on Guy.

He offered a slight bow, his smirk never fading.

"Guy… It has been a while."

There was an underlying amusement in his voice, as if he found all of this an entertaining play.

He elegantly took his seat, crossing one leg over the other, waiting for the drama to unfold.

Then—a tremor shook the ground.

A deep, thunderous force rippled through the hall as giant footsteps approached.

The doors did not open.

No—they were shoved aside as an imposing figure walked through.

Dragruel.

The Titan Demon Lord's very presence was like an earthquake.

His sheer size dwarfed most of the room's occupants.

With each step, the floor creaked beneath his weight.

His molten-gold eyes locked onto Guy.

A deep, gravelly chuckle rumbled from his throat.

"Hah. You're alive after all. Good."

He took his seat, the chair groaning under his weight.

The moment the tension reached its peak, a lazy yawn echoed through the hall.

A figure stumbled in, rubbing his eyes, his wings half-folded, dragging his feet.

"Ughhh… Do we really have to do this now?"

Dino, the Fallen Angel, stretched his arms before slumping into his chair, looking like he was ready to fall asleep at any moment.

His half-lidded eyes glanced at Guy.

"So, what's this about? Some big revelation? Can it wait till after I nap?"

The silence in the room was deafening.

Then—Guy chuckled.

His crimson eyes gleamed.

"Now then…" He leaned forward, resting his elbows on the table.

"Let's begin."

And so, Walpurgis commenced.