The Greatest Assassin Gets Reincarnated in Tensura

The afternoon sun cast a golden glow over the quiet streets as two young children walked side by side, their footsteps light against the pavement. The boy, Leon Cromwell, was a striking figure with long blonde hair that draped over his shoulders. Despite his noble appearance, there was an undeniable awkwardness to him—a hesitation in his movements, a quiet uncertainty in his eyes. He was not distant by choice; words simply failed him, as if the invisible barrier between his thoughts and his tongue was too vast to cross. People mistook his silence for arrogance, but in truth, he was just lost in a world that never seemed to understand him.

Beside him, Chloe Aubert walked with effortless grace. Her short black hair framed her round face, her deep eyes carrying an unspoken kindness that made her presence warm and inviting. She was small, delicate even, yet there was a quiet strength in her—an energy that contrasted Leon's reserved nature. Unlike him, she was good with people, always knowing what to say, how to smile, how to laugh in a way that made those around her feel at ease.

Despite their differences, they were best friends.

Leon had never said it aloud, but he felt something more—something deeper. He didn't fully understand it, this strange warmth in his chest whenever Chloe smiled at him, or the way his heart would tighten when their hands accidentally brushed against each other. But he knew, somehow, that she did not feel the same way. She saw him as a friend, and that was all.

Still, he was content just being by her side.

"Hey, Leon, are you even listening?" Chloe's voice was playful as she nudged his arm.

Leon blinked, realizing he had been staring at the sky, lost in thought. "Ah... yeah," he mumbled.

Chloe giggled. "Liar. You always get that spaced-out look when you're thinking too much. What were you daydreaming about this time?"

Leon hesitated. You, he wanted to say. Instead, he shrugged. "Nothing important."

Chloe sighed dramatically. "You should talk more, you know. One day, you'll have to learn how to express yourself."

"I do talk," he muttered, looking away.

Chloe grinned. "Barely. But that's okay. I understand you just fine."

Leon's heart skipped a beat at that.

They continued walking in comfortable silence, the wind carrying the sound of distant birds as the sun began its descent. The world felt peaceful. Safe. As if nothing could possibly disturb this moment.

Then, the air changed.

A strange pressure settled over them, thick and suffocating. The sky, once a warm shade of orange, flickered—like a broken image, distorting at the edges. The pavement beneath their feet trembled.

Leon stopped. "Chloe… do you feel that?"

Chloe's eyes widened. "Yeah… something's—"

Before she could finish, space itself shattered.

A swirling vortex of darkness erupted before them, pulling at the very fabric of reality. The force was unbearable—an invisible hand seizing their bodies and dragging them toward the unknown.

"Leon!" Chloe screamed, her small fingers desperately clutching onto his sleeve.

Leon tried to hold onto her, tried to reach out, but the pressure was overwhelming. His heart pounded in terror as the world twisted and warped around them. He could feel his body being pulled apart, his very existence unraveling.

"Chloe!" He reached for her, their fingertips barely touching—

And then, she was gone.

Ripped away from him, swallowed by the void.

"NO!" Leon shouted, his voice lost in the chaos as he too was dragged into the abyss.

His last thought before everything faded to darkness was not of fear, nor confusion—

But of regret.

I couldn't protect her.

Then, silence.

That was the day Leon Cromwell and Chloe Aubert vanished from their world—

One thrown into an unfamiliar past, the other into an uncertain future.

Darkness.

For a long moment, there was nothing but an endless abyss.

Leon floated in that vast emptiness, weightless and without form. He couldn't tell if he was awake or dreaming, if he was dead or alive. His mind swirled with fragments of memories—Chloe's smile, their final walk home, the fear in her voice as the world shattered around them.

Then, a voice, deep and emotionless, echoed through the void.

[You have been chosen. Unique Skill: Absolute Purity granted.]

The words were neither loud nor soft. They simply were, as if the universe itself had spoken. Before Leon could even process them, a force gripped his soul, pulling him downward—no, forward.

Light erupted around him, and suddenly—

He awoke.

Leon gasped, his body lurching upright as he took his first breath in this new world. The air was fresh, untouched by pollution, filled with the scent of earth and foliage. Sunlight filtered through towering trees, their emerald leaves swaying gently in the breeze. He was lying on a patch of soft grass, his clothes different from what he remembered. No longer was he in his school uniform—he wore a simple white tunic, slightly oversized, its fabric foreign yet oddly comfortable.

His heart pounded as he scrambled to his feet, taking in his surroundings.

Where am I?

Nothing was familiar. The trees were massive, ancient, their trunks so thick they seemed to touch the sky. Birds called out in strange melodies, and the wind carried a faint whisper of something mystical.

Leon took a hesitant step forward, his mind still reeling. This isn't Earth…

The realization hit him like a punch to the gut. He had really been transported.

And Chloe—

His breath caught. Where is she?

Before he could drown in his own panic, a rustling sound came from the bushes nearby. Leon froze. His body tensed, instincts screaming at him to run, but his legs wouldn't move.

Then, they emerged.

A group of figures, moving gracefully through the underbrush. They weren't human.

Elves.

They were beautiful—elegant features, pointed ears, and shimmering eyes that held an almost otherworldly glow. They wore light armor, the metal sleek and adorned with intricate patterns, their weapons drawn and pointed at him.

Leon's heart pounded.

One of them, a tall elf with silver hair and piercing green eyes, stepped forward. His gaze was sharp, scrutinizing Leon with suspicion.

"Who are you?" the elf demanded, his voice firm yet smooth.

Leon's mouth opened, but no words came out. His mind was blank.

"Speak, human." The elf's grip on his sword tightened. The others shifted, ready to strike at a moment's notice.

Leon swallowed hard. What do I say? He had no idea where he was, why he was here, or how to even begin explaining.

"I—I don't know," Leon finally admitted. His voice was hoarse, uncertain. "I just woke up here…"

The elves exchanged glances. The tension in the air was suffocating.

One of them, a younger-looking elf with dark hair, narrowed his eyes. "Could he be dangerous? A spy, perhaps?"

"He looks lost," another murmured.

"Looks can be deceiving," the silver-haired elf snapped. He studied Leon again, his sharp eyes narrowing. "We take him to Queen Sylvia. She will decide what to do with him."

Leon barely had time to react before one of the elves grabbed his arm, pulling him forward. He didn't resist—what choice did he have? He was alone in an unfamiliar world, surrounded by armed elves who clearly didn't trust him.

As they led him through the dense forest, Leon's mind raced. He had so many questions. What was this world? Why had he been given a Unique Skill? Who was this Queen Sylvia?

Most importantly—was Chloe somewhere in this world too?

After what felt like hours of walking, the thick forest began to thin, revealing a breathtaking sight ahead.

A city, nestled within the trees. Towers of carved white stone rose into the sky, their surfaces entwined with vines and glowing runes. Bridges made of interwoven branches connected platforms high above, where elves moved with effortless grace. A river of crystal-clear water ran through the heart of the city, reflecting the light of floating lanterns.

It was like something out of a dream.

The elves barely gave Leon time to take it all in before they ushered him into a grand structure at the city's center.

The throne room was vast yet intimate, bathed in the golden glow of enchanted torches. At the far end sat a woman unlike any Leon had ever seen before.

Queen Sylvia.

She was stunning—long silver hair cascaded down her back, her violet eyes holding both wisdom and power. She wore a flowing gown of emerald and gold, her presence radiating authority.

Leon felt small in her presence.

The silver-haired elf knelt before her. "My Queen, we found this human in the forest. He appeared out of nowhere. We do not know if he is a threat."

Sylvia's gaze settled on Leon, piercing yet calm. "A human…?" She studied him for a long moment before speaking again. "And what is your name, child?"

Leon hesitated. "…Leon. Leon Cromwell."

"Leon," she repeated softly, as if testing the name on her tongue. "Tell me, how did you come to be here?"

Leon clenched his fists. "I… don't know. One moment, I was walking home, and then everything just… changed."

Sylvia's eyes darkened, as if she understood something he did not. "I see."

She stood, her movements fluid and regal. "You are lost, without home or knowledge of this land. It would be cruel to cast you out."

Leon blinked. "You… believe me?"

A small smile touched Sylvia's lips. "You do not seem like a liar." Then, she stepped closer, her presence almost overwhelming. "You are young, yet your eyes hold great pain. You have lost something, haven't you?"

Leon swallowed, his mind flashing to Chloe.

"…Yes," he whispered.

Sylvia studied him a moment longer before turning to the elves. "He will stay here, under my watch."

The elves stiffened. "My Queen, is that wise?"

"I will take responsibility for him," she said firmly. "And he will learn under me."

Leon's eyes widened. "Learn…?"

Sylvia smiled. "I will teach you. Strength is necessary in this world, Leon. If you are to find your way, you must be prepared for what lies ahead."

Leon felt his heart pound. He didn't fully understand, but something in her voice told him this was fate.

And so, his new life began—under the guidance of Queen Sylvia, the woman who would shape him into the swordsman he was destined to become.