DxD: Scion of Lucifuge

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Roy had spent quite some time in the world of Konosuba. He had "conquered" Wiz, Yunyun, Megumin, Aqua, and even the elusive Chris.

Having achieved his goals in this world, he decided to return to the world of High School DxD.

As for the Demon King of this world...

Well, he wasn't defeated yet.

But that didn't matter.

Rias, Akeno, and the others were eager to experience an adventure in another world. He could let them deal with the Demon King.

Leaving Luna behind as a guide for Rias and the others, and with Chris—managing this world, Roy returned to the world of High School DxD.

He then sent Rias, Akeno, Koneko, Aika Kiryuu, Nezuko Kamado, Shinobu Kocho, Akame, Kurome, Claire, Rinslet, and the others to the world of Konosuba.

With Luna's help—the girls began their adventure in another world.

Roy, meanwhile, stayed home and comforted Grayfia, Sona, Tsubaki, Yasaka, Shizuka, Saeko, Esdeath, and the others—

—

A month later, Roy embarked on a new journey.

This time, he wasn't going to a high-level world. Instead, he chose a world with a lower power level.

That was because his system had finally been upgraded. Previously, he could only increase his strength by forming contracts with powerful beings using his Evil Pieces.

But now, whenever a servant he had contracted with an Evil Piece grew stronger, he would also receive a portion of their power.

In other words, he could now increase his strength by nurturing weaker servants.

So, he set his sights on the world of—Black Bullet.

This was a world where humanity had been defeated by Gastrea—a virus-like parasitic creature.

In this world—pregnant women infected with the Gastrea virus gave birth to children with special abilities.

These children, known as "Cursed Children," possessed the traits of the Gastrea

And all the Cursed Children were adorable little girls.

However, as the virus within them progressed—they would eventually transform into Gastrea themselves.

This made them feared and ostracized by humans—even though their powers were essential for fighting the Gastrea.

Some Cursed Children partnered with humans to eliminate Gastrea.

These children were called "Initiators."

And their human partners were called "Promoters."

Most Promoters saw the Initiators as mere tools.

In this world—most Cursed Children were hated, bullied, and even killed by humans.

Humanity had become corrupted and twisted due to the Gastrea threat.

The Cursed Children lived in the shadows, like rats in the sewers.

Humans relied on their power but also persecuted them.

This world was darker and more twisted than any other world Roy had visited.

But he didn't care. If he got annoyed, he could always just destroy this world with a single Explosion spell.

His purpose in coming here was to save the Cursed Children.

These girls were born with incredible power. With proper training, they could become incredibly strong.

But how many Cursed Children were there in the world?

Roy didn't know the exact number.

But he knew that in the original story, the protagonist, Rentaro Satomi, had an Initial Promoter Rank (IP Rank) of 123,452.

As a new Promoter—he was likely at the bottom of the rankings.

This meant there were at least 123,452 other Promoters.

And each Promoter had an Initiator partner.

So, there were at least 123,452 Cursed Children who were Initiators.

But how many Cursed Children were there in total?

Many more Cursed Children were still living in the shadows, like rats in the sewers.

The total number might even exceed a million.

And all these Cursed Children were potential servants for Roy.

Imagine if he could raise their power to Maou-class—or even higher. The boost to his own strength would be immense.

He might even be able to reach the Solaric-level.

And even if he couldn't increase his power, saving these little girls was still a noble cause.

Who could refuse having a million little sisters?

With that in mind, Roy used the system to teleport to the world of Black Bullet—

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"So this is the Black Bullet world..." Roy muttered, looking down at the earth from high in the sky.

Massive towering structures, reaching towards the heavens, dotted the landscape.

These were the Monoliths, gigantic structures made of Varanium that emitted a special magnetic field to repel Gastrea.

They had been built after humanity's defeat in the war against the Gastrea.

And within these Monoliths—humans lived in protected zones.

Japan was divided into five areas by these Monoliths, and Roy was currently in the area where the original story took place.

Saving all the Cursed Children in the world was a simple task for him. He could just use his magic to gather them all and take them away.

But some of the Initiators in the original story had formed bonds with humans.

In this world, 99% of humans saw the Initiators as mere tools. Roy could easily take those children away with his magic.

But there were a few humans who genuinely cared for the Cursed Children.

Like the protagonist—or the old man who took care of the Cursed Children in the Outer Area.

He couldn't use force to take those children away.

The children living in the sewers of the Outer Area were easy to deal with, but Enju Aihara, who had formed a close bond with the protagonist—Rentaro Satomi—would be more difficult.

Roy was also fond of this adorable little girl and didn't want to let her suffer.

As a Cursed Child—Enju was destined to turn into a Gastrea eventually.

Only Roy could save her.

And to prevent her from forming a bond with Rentaro, he simply had to go back in time to before they met.

That was a year before the start of the original story, when Enju and Rentaro first encountered each other.

It was also when Rentaro left the Tendo family and formed the Tendo Civil Security Corporation with Kisara Tendo.

Kisara—a beautiful young woman with long black hair and an impressive figure, was also a skilled swordswoman.

She was quite similar to Saeko Busujima in some ways.

But Kisara had been saved by Rentaro when she was younger, making it difficult to "poach" her.

So—Roy used his [Time Magic] to go back to the night when Kisara was attacked by a Gastrea.

Although Kisara was the eldest daughter of the main Tendo family, her parents had been targeted by other members of the family for trying to expose their corruption.

And so, on that night, Kisara and her parents were attacked by a Gastrea that suddenly appeared in their home.

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BOOOOOOOOOOOOMMMMMMMMMMMMM!

A massive spider-like Gastrea smashed through the wall.

The seemingly sturdy house quickly collapsed.

"Kisara, RUN!!"

"No! Dad, Mom!"

A young Kisara with black hair and eyes cried out as her parents fought the Gastrea with their handguns.

But they were no match for the creature.

Her parents were both impaled by the Gastrea's legs.

Kisara screamed in anguish, but no one came to help.

Rentaro, who was living with the Tendo family at the time, watched in shock.

The Gastrea turned towards them, and just as it was about to attack...

Rumble!

A rift suddenly opened in the sky, catching their attention.

Roy, dressed in the elegant and noble attire of the Lucifuge family—emerged from the rift. He had used his own power to travel through time.

Only Lucoa among his servants could use Time magic.

After becoming a Stellar-level being—he had asked Lucoa to teach him how to manipulate time.

And after much research and practice, he had finally mastered it.

Now, he could freely travel through time within the same world without relying on the system.

Looking at the two stunned children and the Gastrea, Roy smiled and waved his hand.

The Gastrea instantly turned to ash and vanished.

Young Kisara, witnessing this scene, was awestruck. This moment would be forever etched in her memory.

"Are you a God?" she wondered aloud.

"No—I'm a Devil," Roy replied with a smile, descending from the sky and landing before her.

"A Devil? Whatever you are—please save my parents!" Kisara pleaded, falling to her knees.

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