Reborn as supreme sign-in system wielder

Haruto Sato was an ordinary man in an ordinary life, or so he thought. As a mid-level manager at a logistics company, his days were filled with mundane tasks, endless meetings, and the constant stress of keeping everything running smoothly. Despite being good at his job, Haruto felt an emptiness that he couldn't quite place. It was as if he was drifting through life without a real purpose, his days blending into one another with alarming monotony.

The day started like any other. Haruto woke to the shrill beeping of his alarm, the early morning sunlight barely peeking through his curtains. He rubbed his eyes, feeling the familiar ache in his shoulders from too many hours hunched over his desk. With a resigned sigh, he got up, showered, and dressed in his usual business attire—a crisp white shirt, navy tie, and black slacks. His reflection in the mirror showed a man of average height, with short black hair neatly combed to the side, and dark brown eyes that carried the weight of his weariness. At 32, Haruto looked older than his years, the stress of his job etched into the fine lines on his face.

After a quick breakfast, Haruto grabbed his briefcase and headed out the door. The streets were already bustling with people heading to work, their expressions as tired as his own. As he walked toward the bus stop, his mind was already drifting to the day ahead—a pile of reports to review, a meeting with a difficult client, and the endless grind that awaited him at the office.

Haruto was so lost in his thoughts that he barely noticed the truck speeding down the street. The sound of screeching tires snapped him back to reality, but it was too late. The truck was already upon him, and before he could react, everything went black.

When Haruto opened his eyes again, he was no longer in the busy streets of Tokyo. Instead, he found himself floating in a vast, starry void. The sensation was disorienting, as if he had been untethered from the world he knew. There was no ground beneath him, no sky above—only the endless expanse of stars stretching out in all directions.

"Where… where am I?" Haruto's voice echoed in the void, a small, frightened sound in the immense silence.

"Welcome, Haruto Sato," a deep, resonant voice answered, seemingly coming from all around him.

Haruto turned, trying to find the source of the voice, but there was nothing—only the void. Then, as if summoned by his thoughts, a figure appeared before him. The figure was tall and imposing, garbed in robes that shimmered with the light of a thousand galaxies. Their face was obscured by a veil of light, their form radiating a divine presence that made Haruto feel insignificant by comparison.

"I am the Supreme God of the Omniverse," the figure announced, their voice carrying a power that Haruto could scarcely comprehend. "And I have brought you here to explain the circumstances of your death."

Haruto's heart sank as the memories of the truck came rushing back. "So… I really did die?"

The Supreme God nodded. "Yes, you did. But your death was not meant to happen. It was an accident—a consequence of forces beyond your world."

"An accident?" Haruto echoed, his mind struggling to keep up. "But… why? How?"

"There was an entity in your world, destined to bring great calamity," the Supreme God explained. "I sent a force—what you know as 'Truck-kun'—to eliminate this threat. However, due to a cosmic error, you were caught in the crossfire. For that, I apologize."

Haruto stared at the divine being, his emotions a chaotic mix of fear, confusion, and a strange sense of relief. "So… what happens now? Is this the end for me?"

The Supreme God's voice softened, becoming almost gentle. "No, Haruto Sato. This is not the end. To make amends for the mistake that claimed your life, I will grant you a new one—a life in a world far different from the one you knew. A world of magic, dragons, and demons."

Haruto's eyes widened in disbelief. "A new life… in another world?"

"Indeed. You will be reborn with great potential, as the son of a powerful union. Your mother will be the sister of the Demon Emperor, a succubus of immense beauty and power, and your father will be a dragon, a being of unmatched strength. You will inherit the bloodlines of both—demonic allure and draconic might. But that is not all."

Haruto's breath caught in his throat as the Supreme God continued. "To further ensure your success, I will bestow upon you a Sign-In System—a gift that will grant you incredible abilities as you grow. On your first sign-in, you will receive the most powerful body in the world you will inhabit, a body capable of wielding both your demonic and draconic bloodlines. Along with it, you will also receive a potion—a rare elixir that will strengthen and perfectly harmonize your bloodlines, allowing you to unlock their full potential."

Haruto's mind raced. This was beyond anything he could have imagined. He was just an ordinary man, thrust into extraordinary circumstances. But if what the Supreme God said was true, he was being given a second chance—a chance to live a life of power and adventure in a world straight out of fantasy.

"I accept," Haruto said, his voice steady with newfound determination. "I'll take this second chance and make the most of it."

The Supreme God smiled, a radiant expression that filled the void with warmth. "Very well, Haruto Sato. May your new life be filled with strength and purpose. Now, go forth, and embrace your destiny."

With a wave of their hand, the stars around Haruto began to swirl and coalesce, forming a bright portal that enveloped him. As he was pulled into the light, Haruto felt a sense of peace, his old life fading away as the promise of a new one awaited him on the other side.

And so, Haruto Sato, once an ordinary man, began his journey to become the most powerful being in a world where dragons and demons ruled.