The Greatest Assassin Gets Reincarnated in Tensura

Yuuki Kagurazaka was born with a mind sharper than any blade, a natural-born genius whose intellect stood far beyond the norms of society. His parents, both scholars in their own right, recognized his potential early on and nurtured him with love and wisdom. His childhood was filled with warmth, laughter, and boundless curiosity. His friends admired him, his teachers marveled at his abilities, and the world itself seemed like a playground of infinite possibilities.

But genius alone did not define him—his heart did. Unlike the cold, detached prodigies often found in tales, Yuuki was a boy who cared. He loved the world, his family, and the simple joys of life. He never looked down on others, for he believed that intellect was not a measure of worth. He envisioned a future where he could use his talents to uplift those around him, to build a world where justice and fairness reigned supreme.

He had everything.

Until, one fateful night, everything was taken from him.

It was supposed to be a simple trip—one last vacation before his entrance exams. His parents had planned a weekend retreat, something to help him relax before the rigorous studies that awaited him. The sun had set, painting the sky in hues of crimson and gold, as their car traveled down the highway. The gentle hum of the engine, the rhythmic sound of the tires against the road—everything felt peaceful.

Then, in a single moment, peace turned to chaos.

A truck, its headlights glaring like the eyes of an unfeeling beast, swerved violently into their lane. The driver, overworked and exhausted, had fallen asleep at the wheel. There was no time to react. No time to scream. Only the deafening crash, the sickening crunch of metal, the shattering of glass—then silence.

When Yuuki awoke, the world had changed.

His parents were gone.

He lay in the hospital bed, staring at the ceiling with empty eyes. The doctors called him lucky, a miracle survivor. But what was lucky about living in a world where his parents were dead? Where everything he loved was ripped away in an instant? The funeral was a blur—the sympathetic faces of distant relatives, the empty words of condolences, the whispers of "such a tragedy."

But the real tragedy had yet to unfold.

When the case went to court, Yuuki believed in justice. He believed in the system his parents had taught him to respect. The driver, the man responsible for his parents' deaths, would face the consequences of his actions. That was how society worked, wasn't it?

He was wrong.

The court ruled the driver innocent.

They cited overwork, unfair working conditions, and systemic failures. They said he was a victim too. They said the real problem lay in the structure of the industry. Yuuki listened to every word, feeling something inside him crack. He did not seek revenge. He did not want senseless punishment. He only wanted accountability.

But justice was not blind. It was bound by bureaucracy, by laws written by those who never had to suffer as he did. His parents were gone, and all he received in return was empty rhetoric.

That night, as he sat alone in his darkened room, his hands clenched into fists. He had two choices: destroy this broken world… or change it.

Yuuki refused to let his parents' deaths be in vain. If the world was unfair, then he would remake it. Not through violence, not through destruction—but through power. Real power. The power to shape laws, to uproot corruption, to create a system where tragedies like his would never happen again.

He abandoned his initial dreams and set his sights on politics. He studied governance, law, economics—every facet of society's foundation. He would rise through the ranks, gather allies, and become a leader who could reshape the world. He would find like-minded individuals, people who shared his vision, and together they would fix this broken world, step by step.

The fire of determination burned within him.

But before he could take his first step, fate intervened once more.

One evening, as Yuuki sat at his desk, refining his grand plan, an unnatural silence filled the air. The hum of his laptop, the distant sounds of the city—all faded into an eerie void. A voice, neither male nor female, resonated in his mind, carrying an otherworldly weight.

"You have been chosen."

The room warped, reality itself twisting into something beyond comprehension. A blinding light enveloped him, and in that moment, he realized—he was being summoned. His carefully laid plans, his ambitions, everything he had built up to that moment was being ripped away.

He tried to resist, to fight against the pull of an unseen force, but it was futile. The voice continued, resonating through his very soul.

"Welcome to the Cardinal World."

A surge of power rushed through him, and in that moment, his body was no longer his own. His consciousness expanded, his very being transformed. He was no longer just Yuuki Amano, the prodigy of Earth.

He was something greater.

As he was transported across dimensions, he felt knowledge pouring into him. A voice, vast and infinite, whispered to him, bestowing him with two abilities beyond mortal comprehension:

Anti-Skill – The power to nullify and counteract any ability, any magic, any force that sought to overpower him.

Unique Skill: Creator – The ability to shape and manifest concepts into reality, to bring forth constructs, weapons, and systems that had never existed before.

It was as if the universe itself had acknowledged his ambitions. He was no longer bound by Earth's laws or its broken systems. He was in a new world—one without governments, without order.

A world ripe for change.

As his vision cleared, he found himself standing before a grand throne in an unfamiliar land. The air crackled with energy, the skies vast and unknown.

Yuuki Kagurakaza had lost everything once.

Now, he had been given the chance to create everything anew.

And this time, he would not be bound by the failures of the past.

The genius had fallen. Now, he would rise as the architect of a new world.