'Oops! I Stole the Isekai Lottery'-Chapter 80: The Supreme Demon Slayer Training Arc: Tridents, Tanjiro, and Total Chaos

Before diving into Raja's insane training regime, it's crucial to understand the roots of Sun Breathing—the most powerful and original breathing style, from which all other styles branched out. Sun Breathing was first wielded by the legendary swordsman Yoriichi Tsugikuni, the ultimate demon slayer who nearly one-shot Muzan Kibutsuji.

Through generations, Sun Breathing gave rise to multiple variations:

Flame Breathing (Focused on powerful, fiery strikes)- Variation (Love Breathing)

Water Breathing (Fluid movements and adaptability)-Three Variations (Flower, Serpent, Insect Breathings)

Thunder Breathing (Speed-based attacks)- Variation (Sound Breathing)

Stone Breathing (Raw power and endurance)

Wind Breathing (Agility and cutting force)- Two Variations (Beast & Mist Breathings)

Moon Breathing (Corrupted version, used by Kokushibo)

However, Raja, being the Supreme Demon Slayer, didn't settle for ordinary Sun Breathing. No, he upgraded it to a whole new level—introducing Sun Breathing with the Divine Trident ("Trishul"), blending swordsmanship, magic, and raw physical power.

At the tender age of 13, a fresh batch of Demon Slayer trainees entered the Final Selection:

Tanjiro Kamado – Now Raja's personal disciple, learning Sun Breathing from the actual reincarnation of divinity.

Inosuke Hashibira – Trained in Beast Breathing under Gyomei, the most jacked Cool man in history.

Zenitsu Agatsuma – Still screaming his lungs out while training in Thunder Breathing under Jigoro Kuwajima.

Kanao Tsuyuri – Learning Flower Breathing under Kanae Kocho, balancing elegance with lethality.

Genya Shinazugawa – The odd one out. No Breathing technique? No problem. Raja, being the genius he is, transformed Genya into John Wick meets Batman, developing a Gun Kata style of demon slaying.

Genya's inability to use Breathing Styles initially left him depressed—until Raja, in his usual dramatic fashion, slammed a suitcase on the table, revealing:

Nichirin bullets (infused with sunlight)Enchanted throwing knives (capable of storing sunlight)

A gun range with moving demon-shaped targets

A secret technique: "Eat This, and You'll Be Unstoppable"

Genya: "You're kidding... right?"

Raja: "Nope. You digestive System is Out of this World, so I made you an experimental potion. It gives you 15 minutes of Ultra Instinct."

Within weeks, Genya turned into an unstoppable hybrid of a demon-hunting assassin and a living tank. He could dodge attacks, shoot demons in mid-air, and even dual-wield enchanted pistols with Nichirin Sun bullets like a one-man apocalypse.

Unlike traditional sword users, Raja wielded a Divine Trident ("Trishul") forged from sun ores, magical metals, and pure badassery. His Sun Breathing techniques were as deadly as they were stylish.

Sun Breathing: Trident Combat Techniques

Sunstrike Thrust – A piercing attack that instantly vaporizes the enemy.

Flare Cleave – A wide, flaming slash that cuts down multiple demons at once.

Solar Guard – Blocks incoming attacks, then redirects them back.

Helios Counter – Parries an attack, then strikes critical weak points.

Blazing Lunge – Dashes forward and impales demons through the heart.

Radiant Disarm – Knocks weapons (or limbs) off enemies.

Dawn Rising Sweep – A low sweeping attack that trips and crushes foes.

Blinding Flash – Uses sunlight reflection to blind enemies.

Sunbeam Barrage – A flurry of thrusts to overwhelm opponents.

Solstice Slam – A full-force trident slam that leaves a crater.

Result? Demons ran at the sight of Raja, screaming in terror before even engaging in battle.

Raja took special care in training Tanjiro, mostly because the kid listened to him without arguing.

Raja: "Step One: Breathe properly.

Step Two: Swing your sword.

Step Three: If you lose, I'm disowning you."

Tanjiro: "Wait, what?!"

To enhance Tanjiro's Sun Breathing, Raja dragged him into extreme training:

Dodging actual lightning strikes.

Carrying boulders up mountains.

Chopping trees in a single strike.

Cooking the perfect rice, because Raja believes warriors must also be chefs.

Gyomei took charge of Inosuke, teaching him Beast Breathing, but every lesson ended in chaos.

Inosuke: "THIS TECHNIQUE IS WEAK! I'M MAKING MY OWN!"

Gyomei: "Inosuke, you need to calm down—"

Inosuke: "NEVER!" -headbutts a tree-

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Meanwhile, Raja stealthily enhanced Inosuke's abilities by modifying his swords to be even more jagged and lethal. He also made Inosuke's boar mother a spirit guardian, so she guided him in his dreams and saves him from lethal attacks.

Jigoro Kuwajima tried training Zenitsu, but Raja had a better idea.

Raja: "Zenitsu, I set loose 50 rabid dogs. If you don't outrun them, you're dinner."

Zenitsu: "WHY?!"

Raja: "You only fight well when you're terrified, so I'm making you permanently terrified."

Results?

Zenitsu became the fastest Demon Slayer.

He developed new Thunder Breathing techniques out of sheer survival instinct. Yes now he can perform all the techniques.

Kanao trained under Kanae Kocho, refining Flower Breathing with deadly precision.

Raja, however, added extra insanity to her training:

Dodging poisoned kunai while blindfolded.

Walking across tightropes over actual lava.

Taming wild birds using only eye contact.

By the end, Kanao could defeat demons with a single swing, and she trained her reflexes to superhuman levels.

By the time the Final Selection came around, Genya had mastered his dual-wielding guns, knives, and demon digestion powers.

One test from Raja involved giving Genya a single bullet and forcing him to take out 20 demons.

He succeeded.

Genya: "I feel unstoppable!"

Raja: "Good. Now shoot that rock."

Genya: "What—?"

Raja: "The rock is actually a demon in disguise."

(He was lying, but Genya shot it anyway.)

On the day of the Demon Slayer Corps graduation, Raja gathered his students:

"You are no longer children. You are warriors. The strongest slayers of this generation. Remember—Demons are stupid, and if they ever act smart, that's just because they haven't met me yet."

Tanjiro: "That's... not exactly inspiring?"

Raja: "Fine. Here's something inspiring—If you ever lose a battle, I'm personally coming back to beat you up."

Inosuke: "HAHA! BRING IT ON!"

Zenitsu: "Please don't—"

Kanao smiled. Genya just reloaded his gun. And thus, the Supreme Demon Slayers's first generation of disciples was born.