Before diving into Raja's insane training regime, it's crucial to understand the roots ofSun Breathing—the most powerful and original breathing style, from which all other styles branched out. Sun Breathing was first wielded by the legendary swordsmanYoriichi 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, heupgraded it to a whole new level—introducingSun Breathing with the Divine Trident ("Trishul"), blending swordsmanship, magic, and raw physical power.

At the tender age of13, a fresh batch of Demon Slayer trainees entered the Final Selection:

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

Inosuke Hashibira– Trained inBeast BreathingunderGyomei, the most jacked Cool man in history.

Zenitsu Agatsuma– Still screaming his lungs out while training inThunder BreathingunderJigoro Kuwajima.

Kanao Tsuyuri– LearningFlower BreathingunderKanae Kocho, balancing elegance with lethality.

Genya Shinazugawa– The odd one out. No Breathing technique? No problem. Raja, being the genius he is, transformed Genya intoJohn Wick meets Batman, developing aGun Katastyle of demon slaying.

Genya's inability to use Breathing Styles initially left himdepressed—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 you15 minutes of Ultra Instinct."

Within weeks, Genya turned into anunstoppable 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 aone-man apocalypse.

Unlike traditional sword users, Raja wielded aDivine Trident ("Trishul")forged fromsun ores, magical metals, and pure badassery.His Sun Breathing techniques were asdeadly as they were stylish.

Sun Breathing: Trident Combat Techniques

Sunstrike Thrust– Apiercingattack thatinstantly vaporizesthe enemy.

Flare Cleave– Awide, flaming slashthatcuts down multiple demonsat once.

Solar Guard– Blocks incoming attacks, thenredirects them back.

Helios Counter– Parries an attack, thenstrikes critical weak points.

Blazing Lunge– Dashes forward and impales demonsthrough the heart.

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

Dawn Rising Sweep– Alow sweeping attackthat trips and crushes foes.

Blinding Flash– Usessunlight reflectionto blind enemies.

Sunbeam Barrage– Aflurry of thruststo overwhelm opponents.

Solstice Slam–A full-force trident slamthatleaves a crater.

Result?Demons ran at thesight of Raja, screaming in terror before evenengaging in battle.

Raja tookspecial carein trainingTanjiro, mostly because the kidlistened 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 enhanceTanjiro's Sun Breathing, Rajadragged himinto 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 ofInosuke, teaching himBeast Breathing, but every lessonended in chaos.

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

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

Inosuke:"NEVER!"-headbutts a tree-

Meanwhile, Rajastealthily enhanced Inosuke's abilitiesby modifying his swordsto be even more jagged and lethal.He also madeInosuke's boar mother a spirit guardian, so sheguided him in his dreams and saves him from lethal attacks.

Jigoro Kuwajima tried training Zenitsu, butRaja 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 thefastestDemon Slayer.

Hedeveloped new Thunder Breathing techniquesout of sheersurvival instinct.Yes now he can perform all the techniques.

Kanaotrained under Kanae Kocho, refiningFlower Breathingwithdeadly precision.

Raja, however, addedextra insanityto 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 shetrained her reflexes to superhuman levels.

By the time theFinal Selectioncame around, Genya hadmastered his dual-wielding guns, knives, and demon digestion powers.

One test from Raja involvedgiving 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 theDemon Slayer Corps graduation, Raja gathered his students:

"You are no longer children. You are warriors. The strongest slayers of this generation. Remember—Demons arestupid, 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.

Source: Webnovel.com, updated by lotustale.com