A world of magic and swords. User, an ordinary boy, lived a peaceful life surrounded by his childhood friend Uniel and his sister Yuna.

However, beneath the surface, twisted emotions were quietly swirling.

Carlos, the eldest son of a prestigious noble family. Though expected to be the strongest, he could never match the "true geniuses" Uniel and Yuna, leading to his parents' disappointment. That inferiority complex eventually warped into hostility toward the two.

Then, one day, tragedy struck.

Uniel and Yuna were murdered.

The reality was far too cruel. While the culprit behind the scenes remained unrevealed, suspicion fell heavily upon Carlos.

Having lost everything and with his heart broken, User was approached by Sifa, a Demon King who was supposed to have been defeated long ago.

By forming a contract with her, User obtained the power of the Demon King. To seek revenge, he discarded his humanity and fell into an existence that trampled the world.

—And then, thirty thousand years later.

Having become the perfect Demon King, User faced the final battle against the Hero's party. The battle was overwhelmingly in his favor.

However, the Hero uttered a certain phrase. Those words overlapped with something Uniel had once said to him, awakening memories and emotions he had long since sealed away.

That momentary hesitation became a fatal opening, and User was defeated. His life as the Demon King was supposed to end there—or so he thought.

Yet, at the moment of death...

He felt a strange sensation amidst the light. A weight on his body, a touch on his cheek.

Though he suspected the Demon King Sifa was behind it, she denied any involvement.

Eventually, as his vision cleared, he found himself in... His old bedroom.

And there was his sister Yuna, who was supposed to be dead, smiling as if nothing had happened.

Furthermore, his childhood friend Uniel appeared through the door.

—User had returned to the past.

Moreover, he retained his powers as the Demon King and his thirty thousand years of memories. And the Demon King Sifa existed there alongside him as well.

Sifa speaks. She suggests the possibility that this tragedy was "not a coincidence."

And suspicion turns toward one name.

—Carlos.

As one who knows everything, User has gained a chance to start over. A future to protect, and a past that cannot be erased.

He must now make a choice.

Will he change fate to protect his loved ones? Or will he destroy everything and achieve complete revenge?

A world of magic and swords. User, an ordinary boy, lived a peaceful life surrounded by his childhood friend Uniel, a blonde girl with a ponytail, and his younger sister Yuna, a long-haired girl with blue hair.

However, beneath the surface, twisted emotions were quietly swirling.

Then, one day, tragedy struck.

Uniel and Yuna were murdered.

The reality was far too cruel. While the culprit behind the scenes remained unrevealed, suspicion fell heavily upon Carlos.

Having lost everything and with his heart broken, User was approached by Sifa, a Demon King who was supposed to have been defeated long ago. By forming a contract with her, User obtained the power of the Demon King. To seek revenge, he discarded his humanity and fell into an existence that trampled the world.

—And then, thirty thousand years later.

Having become the perfect Demon King, User faced the final battle against the Hero's party. The battle was overwhelmingly in his favor.

However, the Hero uttered a certain phrase. Those words overlapped with something Uniel had once said to him, awakening memories and emotions he had long since sealed away.

That momentary hesitation became a fatal opening, and User was defeated. His life as the Demon King was supposed to end there—or so he thought.

Yet, at the moment of death...

He felt a strange sensation amidst the light. A weight on his body, a touch on his cheek.

Though he suspected the Demon King Sifa was behind it, she denied any involvement.

Eventually, as his vision cleared, he found himself in... His old bedroom.

And there was his sister Yuna, who was supposed to be dead, smiling as if nothing had happened.

Furthermore, his childhood friend Uniel appeared through the door.

—User had returned to the past.

Moreover, he retained his powers as the Demon King and his thirty thousand years of memories. And the Demon King Sifa existed there alongside him as well.

Sifa speaks. She suggests the possibility that this tragedy was "not a coincidence."

And suspicion turns toward one name.

—Carlos.

As one who knows everything, User has gained a chance to start over. A future to protect, and a past that cannot be erased.

He must now make a choice.

Will he change fate to protect his loved ones? Or will he destroy everything and achieve complete revenge?

A world of magic and swords. User, an ordinary boy, lived a peaceful life surrounded by his childhood friend Uniel, a blonde girl with a ponytail, and his younger sister Yuna, a long-haired girl with blue hair.

However, beneath the surface, twisted emotions were quietly swirling.

Then, one day, tragedy struck.

Uniel and Yuna were murdered.

The reality was far too cruel. While the culprit behind the scenes remained unrevealed, suspicion fell heavily upon Carlos.

Having lost everything and with his heart broken, User was approached by Sifa, a Demon King who was supposed to have been defeated long ago. By forming a contract with her, User obtained the power of the Demon King. To seek revenge, he discarded his humanity and fell into an existence that trampled the world.

—And then, thirty thousand years later.

Having become the perfect Demon King, User faced the final battle against the Hero's party. The battle was overwhelmingly in his favor.

However, the Hero uttered a certain phrase. Those words overlapped with something Uniel had once said to him, awakening memories and emotions he had long since sealed away.

That momentary hesitation became a fatal opening, and User was defeated. His life as the Demon King was supposed to end there—or so he thought.

Yet, at the moment of death...

He felt a strange sensation amidst the light. A weight on his body, a touch on his cheek.

Though he suspected the Demon King Sifa was behind it, she denied any involvement.

Eventually, as his vision cleared, he found himself in... His old bedroom.

And there was his sister Yuna, who was supposed to be dead, smiling as if nothing had happened.

Furthermore, his childhood friend Uniel appeared through the door.

—User had returned to the past.

Moreover, he retained his powers as the Demon King and his thirty thousand years of memories. And the Demon King Sifa existed there alongside him as well.

Sifa speaks. She suggests the possibility that this tragedy was "not a coincidence."

And suspicion turns toward one name.

—Carlos.

As one who knows everything, User has gained a chance to start over. A future to protect, and a past that cannot be erased.

He must now make a choice.

Will he change fate to protect his loved ones? Or will he destroy everything and achieve complete revenge?

A world of magic and swords. User, an ordinary boy, lived a peaceful life surrounded by his childhood friend Uniel, a blonde girl with a ponytail, and his younger sister Yuna, a long-haired girl with blue hair.

However, beneath the surface, twisted emotions were quietly swirling.

Then, one day, tragedy struck.

Uniel and Yuna were murdered.

The reality was far too cruel. While the culprit behind the scenes remained unrevealed, suspicion fell heavily upon Carlos.

Having lost everything and with his heart broken, User was approached by Sifa, a Demon King who was supposed to have been defeated long ago. By forming a contract with her, User obtained the power of the Demon King. To seek revenge, he discarded his humanity and fell into an existence that trampled the world.

—And then, thirty thousand years later.

Having become the perfect Demon King, User faced the final battle against the Hero's party. The battle was overwhelmingly in his favor.

But the Hero uttered a certain phrase. Those words overlapped with something Uniel had once said to him, awakening memories and emotions he had long since sealed away.

That momentary hesitation became a fatal opening, and User was defeated. His life as the Demon King was supposed to end there—or so he thought.

Yet, at the moment of death...

He felt a strange sensation amidst the light. A weight on his body, a touch on his cheek.

Though he suspected the Demon King Sifa was behind it, she denied any involvement.

Eventually, as his vision cleared, he found himself in... His old bedroom.

And there was his sister Yuna, who was supposed to be dead, smiling as if nothing had happened.

Furthermore, his childhood friend Uniel appeared through the door.

—User had returned to the past.

Moreover, he retained his powers as the Demon King and his thirty thousand years of memories. And the Demon King Sifa existed there alongside him as well.

Sifa speaks. She suggests the possibility that this tragedy was "not a coincidence."

And suspicion turns toward one name.

—Carlos.

As one who knows everything, User has gained a chance to start over. A future to protect, and a past that cannot be erased.

He must now make a choice.

Will he change fate to protect his loved ones? Or will he destroy everything and achieve complete revenge?