Japan.
Obstetrics and Gynecology Hospital.
Doctors and nurses bustled frantically through the corridors.
"Mrs. Yuuki in Room 022 is about to give birth! Prepare for delivery, quickly!"
"Yes, Director!"
The hustle continued ceaselessly.
Until evening.
Accompanied by a loud cry.
Mr. Yuuki, who had been anxiously waiting outside the delivery room, felt his heart, which had been hanging high, finally drop heavily to the ground.
The man named [Yuuki Judai] was born on the evening of August 31st.
...
Five years passed in a flash.
Mr. and Mrs. Yuuki had always doted exceptionally on their son, Yuuki Judai.
Although their child seemed slightly different from ordinary children. Aside from that initial cry upon birth, Yuuki Judai hadn't shed another tear since. He could speak within months, and by the age of two, he displayed an intellect far surpassing other children.
What was even more astonishing was this:
Recently, Mr. Yuuki had come home early from work. He was surprised to discover his son, Yuuki Judai, engrossed in a thick Duel Monsters textbook. While it was an era where Duel Monsters was a national pastime, for a five-year-old child, such a weighty dueling tome seemed utterly beyond his grasp. Yet, he devoured it with relish.
This made Mr. Yuuki feel, on more than one occasion, that his son might be a dueling genius seen only once in a millennium.
On this day, August 31st, Yuuki Judai's fifth birthday.
Mr. Yuuki bought a pack of the latest cards from a duel card shop and presented it to Yuuki Judai as a birthday gift.
"Thank you, Father."
In a manner so polite it seemed utterly unbefitting a child, Yuuki Judai took the card pack from his father and opened it publicly.
However, when the card named [Yubel] appeared before Yuuki Judai, the child who usually carried himself like a little adult now displayed a look of genuine surprise.
...
"I..."
"So I really did transmigrate into the Yu-Gi-Oh! GX world..."
"...and became Yuuki Judai himself?"
Night fell.
Yuuki Judai sat on his bed in his room, silently gazing at the [Yubel] card in his hand.
Indeed. He was a transmigrator from another world. In his previous life, as a card enthusiast, he had also harbored a great longing for the world of Yu-Gi-Oh! However, after a card shop tournament, an accident transported him to this new world.
At first, upon hearing his name was 'Yuuki Judai,' he had felt somewhat surprised. After all, as a card enthusiast, how could he not know about the famous second-generation King of Games? Initially, Judai still couldn't quite believe it, thinking he'd merely coincidentally shared a name with Yuuki Judai.
But it wasn't until the [Yubel] card appeared on his fifth birthday that Yuuki Judai truly confirmed everything.
"Fate truly plays tricks on people. I kept wondering why I was starting to look more and more like Yuuki Judai..."
"No, wait, I am Yuuki Judai!"
Looking at the adorable jellyfish-haired boy in the mirror, who already showed the nascent form of his future self, Yuuki Judai rubbed his chin and shook his head resignedly.
While he had no objections to becoming Yuuki Judai, the thought of Yuuki Judai's future persona as the [Lone Hero] gave him a headache. Especially after experiencing the mid-to-late stages of the plot, post-Yubel arc, Yuuki Judai had almost entirely become the lone hero, evolving into 'Twenty-dai'.
Although he knew the future storyline, Yuuki Judai wasn't sure if he had the power to change everything. Gazing at the [Yubel] in his hand, Yuuki Judai's emotions were incredibly complex.
'Heheheh, Judai... Judai...'
'We've finally met again...'
He could faintly feel Yubel's summons beside him. In fact, even before this, Judai had occasionally been able to sense the presence of spirits. Perhaps this was a talent he had possessed since childhood. The Power of the Supreme King, residing within Judai's soul, was already beginning to manifest.
However...
To merely know he possessed immense power but not how to use it, was it not as pathetic as holding a safe full of cash without knowing the combination?
Yuuki Judai sighed, then flopped onto his bed in a spread-eagled pose.
"Well..."
"Forget it. I'll take it one step at a time."
"Besides, having lived two lives, I shouldn't be as fragile as the original character."
Gazing at the [Yubel] card in his hand, Yuuki Judai murmured softly.
[Detecting Host acquiring key item]
[Strongest Duel King System — Activating!]
"?!"