DxD: Scion of Lucifuge

"Have you ever spared a pig or a cow because it begged you for its life?"

— Mereum, Hunter x Hunter

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[ Push the Story Forward with your Power Stones ]

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When Roy woke up in the morning, he discovered that the system had added three new worlds to the travel list, along with one travel attempt.

He also needs to prepare to face the High-Class Devil Riser Phenex.

Why Riser Phenex, you ask?

Well, it's obvious, isn't it?

Because of Rias, she wouldn't be able to defeat Riser Phenex, so Roy had to step in. He couldn't just stand by and watch Rias marry Riser.

Of course, with Roy's current strength, facing Riser was a losing battle. Riser possessed the traits of a Phoenix, including immortality.

Any injury would simply be followed by rebirth from the ashes. Even Rias Power of Destruction was useless against him in the original story.

In fact, if Riser didn't have immortality, his strength wouldn't be that impressive. But with that bug-like ability, defeating him at the same level was impossible without special means.

Therefore, Roy had to become stronger, and quickly.

He glanced at the three newly available worlds.

The first world: My Little Sister Can't Be This Cute.

Another slice-of-life anime...

Although Kuroneko was cute, now wasn't the time to chase girls.

He moved on to the next world.

The second world: Pokémon.

This was a world where Pokémon and humans coexisted. Humans, as trainers, would capture, train, and battle with Pokémon. They would nurture them or keep them as pets.

As a Devil, having a Familiar was essential, but he would have to visit this world another time.

The third world: Demon Slayer.

The moment he saw this world, Roy's eyes lit up. This was it.

Demon Slayer, a classic anime, was deeply ingrained in Roy's memory. It was also a world with man-eating monsters called Demons.

The first Demon to appear was named Muzan Kibutsuji.

Muzan Kibutsuji was born in the distant Heian period. Before he was even born, Muzan almost died due to his frail body.

He was practically a stillborn. But with a desperate will to live, Muzan clawed his way back from the brink of death.

However, before he even reached the age of twenty, he became bedridden with a terminal illness.

A kind doctor, hoping to prolong his life, developed a medicine for him. But the medicine's side effects led Muzan to believe his condition had worsened, and in a fit of rage, he killed the doctor.

Only after the doctor's death did Muzan realize that not only had his health been restored, but he had also gained an immortal and even stronger body. However, he also developed a craving for human flesh and blood.

While this wasn't a problem for Muzan, who had gained immense power, he had one fatal weakness: sunlight was lethal to him.

To overcome this weakness, Muzan studied the doctor's medicine formula and discovered that the final product required a plant called the "Blue Spider Lily."

However, only the doctor knew where this Blue Spider Lily grew and how to Grow it.

Thus, Muzan, in his quest to become the ultimate immortal monster, began creating countless Demons to search for the Blue Spider Lily.

This was the origin of Demons.

Opposing them was the Demon Slayer Corps.

The first Demon Slayer was Yoriichi Tsugikuni, the younger son of the Tsugikuni clan.

Yoriichi was also the first swordsman to master Breathing Styles.

He was exceptionally gifted, born with the Demon Slayer Mark and an innate understanding of the Transparent World and the principles of Breathing Styles.

As an adult, Yoriichi created Sun Breathing based on his understanding of Breathing Styles.

Its primary function was to strengthen the heart and lungs, allowing the blood to absorb a large amount of oxygen in a short time.

This could instantly increase physical abilities, temporarily granting strength comparable to a Demon's.

However, because others couldn't withstand the power of the sun, they couldn't learn Sun Breathing.

Yoriichi then guided them to develop other Breathing Styles derived from Sun Breathing, including the five basic styles: Water, Thunder, Flame, Stone, and Wind.

After that, the members of the Demon Slayer Corps created a variety of derived Breathing Styles based on these five foundational ones.

The emergence of Breathing Styles provided the Demon Slayer Corps with a powerful weapon against Demons, gradually giving them an advantage in the war against them.

And what interested Roy the most were these Breathing Styles.

He had researched Breathing Styles long ago, but he couldn't grasp the essentials.

This was understandable. Even Yoriichi was born with an innate understanding of Breathing Styles, which allowed him to create Sun Breathing.

Otherwise, with Roy's talent in swordsmanship, he could have become a formidable force by creating his own Breathing Style.

Therefore, his primary goal in going to the Demon Slayer world was to acquire a Breathing Style, which should be relatively easy to achieve. The Demon Slayer Corps didn't keep their Breathing Styles secret.

His secondary goal was to recruit a few servants to increase his strength, preferably enough to allow him to become an High-Class.

With his mind made up, Roy took Saeko's hand and smiled at the other girls. "See you all later!"

He then selected the Demon Slayer world.

In the next moment, they vanished in a flash of white light, leaving the other girls behind.

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