'Oops! I Stole the Isekai Lottery'-Chapter 79: The Supreme Demon Slayer Arc: Chaos, Power, and Muzan’s Worst Nightmare

From the moment Raja and Gyomei began their rigorous training, the entire Demon Slayer Corps felt a shift in the air. Gyomei was already a monster in physical combat, and now he had a battle maniac as his partner. The training was not for the weak-hearted.

"Brother, let's start with 1000 push-ups!" Gyomei announced with enthusiasm.

"Make it 5000," Raja smirked. "And we'll do it while balancing boulders on our backs."

Thus began a daily schedule of superhuman workouts that would make even the most seasoned warriors weep. Their training ground had craters from excessive sparring, trees were split in half, and the sound of battle could be heard from miles away.

Meanwhile, Raja's clones, under Maya's command, monitored the main characters. But instead of outright intervening, they subtly assisted when necessary—like divine guardian spirits playing pranks.

One clone observed Inosuke Hashibira, a wild boy raised by boars, as he roamed the forest. Inosuke's chaotic energy was truly something to behold. The clone occasionally nudged events in his favor—healing his wounds, enhancing his senses with light magic, and even making food magically appear when he was too stubborn to forage properly.

When Inosuke's beloved boar mother passed away from old age, Raja took action. He preserved her soul and transformed her into a spirit companion.

One night, Inosuke saw a strange white figure. His mother's spirit led him toward a glowing magic circle, where, upon stepping in, he was instantly teleported to the Demon Slayer Corps. Raja, sitting on a rock, greeted him with a wave.

"Welcome, pig-head. Ready to become a Demon Slayer?"

While one of Raja's clones quietly observed Zenitsu, refraining from interfering due to his divine Thunder Spirit connection, another clone closely watched Tanjiro Kamado and his family.

One night, when Tanjiro's father, Tanjuro Kamado, fell gravely ill, Raja personally teleported to their home—this time, not as a Supreme Wizard King, but as a wandering healer.

"Greetings, travelers," Tanjuro said weakly.

"I'm just a humble travelling healer," Raja grinned. "And this is my towering rock of a brother, Gyomei."

For one week, Raja treated Tanjuro, played with the Kamado children, chopped wood, and cooked food. The Kamado family, touched by his kindness, offered him their deepest gratitude.

Curious, Raja feigned ignorance and asked about the Hanafuda earrings.

Tanjuro smiled. "These were gifted to our ancestors by a wandering swordsman with a dance-like sword style."

Gotcha, Raja thought, confirming the connection to Yoriichi Tsugikuni.

When the Kamado family insisted on repaying him, Raja casually adopted them into his household. "Your repayment? Join my family. I'll give you all a better life."

Soon after, the Kamado family moved to the Ubuyashiki Manor, where Tanjiro met Inosuke and joined the training.

The Demon Slayer Selection Exam had always been a death trap. Raja decided to change that.

His clones secretly rescued candidates before they could die, giving them a "Try Next Year" participation medal. He also saved Makomo and Sabito, ensuring that no future warriors were lost before their time.

Meanwhile, Raja himself upgraded the Hashira, giving them:

✅ Age-Extending Potions (because why let legends die young?)

✅ Enhanced Reflexes & Strength

✅ New Equipment and Magical Reinforcements

The Demon Slayer Corps was now an unstoppable force.

Raja sent a clone to tail the eldest Kocho sister, Kanae, when she was ambushed by Upper Moon Doma.

For the first time in centuries, Doma felt fear.

Why? Because just as he was about to kill Kanae, Raja appeared, looking exactly like Yujiro Hanma.

Doma blinked. "Who the hell are y—"

Before he could finish, Raja decked him across the forest.

For the next ten minutes, Raja proceeded to beat Doma like a piñata, using Sun Breathing-enhanced punches. Every strike burned. Doma, who had never felt pain before, was screaming.

"You're supposed to be an Upper Moon?" Raja taunted. "You cry too much."

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Doma, utterly humiliated, tried to run away, but Raja simply leaned against a tree and mocked him.

"You can run, but if you ever eat another human before defeating me, you're just a coward."

Doma froze. His pride wouldn't allow him to ignore this challenge.

"...Fine," Doma growled. "I'll only eat animals from now on. But one day, I will eat you!"

"Sure, Chicken God. Whatever helps you sleep at night."

Thus, Doma developed a crippling fear of Raja.

By this point, Raja had fully transformed the Demon Slayer Corps.

✅ He turned it into an intelligence powerhouse, gathering demon-related intel nationwide.

✅ He industrialized the Corps, improving weapons, logistics, and efficiency.

✅ He met with every Hashira, offering them life-extending potions to ensure they could fight at peak condition.

With the Corps at its strongest in history, Raja became known as "Little Lord"—a name that struck fear into both demons and bureaucrats alike.

Years passed.

On Tanjiro's 13th birthday, a rune alarm triggered at the Kamado residence.

Raja, sharpening his blade, grinned wickedly. "Finally."

Teleporting to Tanjiro's house, he shapeshifted into a mysterious figure and sat near the entrance, waiting.

Then—

Step... step... step...

The door creaked open.

Standing outside was Muzan Kibutsuji.

He froze.

Sitting right in front of him, sharpening his blade, was a man who exuded absolute menace.

Raja slowly turned his head, locking eyes with Muzan.

With a smirk, he spoke:

"I've been waiting for you for ages, Muzan."

Muzan screamed internally, SLAMMED the door shut, and ran for his life.

Raja let him go—but not before casting a silent, invisible tracking rune on him.

"Run, little demon king," Raja chuckled. "You can't hide from me now."

The Demon Slayer Corps was at its peak.

The Kamado family was safe.

Upper Moons feared Raja's name.

And Muzan?

Muzan was about to experience a level of paranoia never seen before in history.

Because now, the hunt had truly begun.

"The Supreme Demon Slayer does not chase... but his prey always runs."