It had been a few days since I fought Vali and dealt with all that wild crap, and now here I was—sitting on a damn train. With who, you ask? None other than Sona, Tsubaki, and my bro Saji. And guess where we were heading?
Straight. To. Hell.
No, like literally.
And no, we weren't dead. Not yet at least.
Sona had this big fancy meeting scheduled with the Four Great Satans and a bunch of other high-class devils or whatever. Real important stuff. Me? I didn't give a flying demon turd. I was just tagging along because Sona invited me. She told me to be on my best behavior, but I wasn't really listening. I nodded like a good boy, though. Gotta keep up appearances.
Anyway, we finally arrived and holy mother of dragons, the Underworld was on some next-level fantasy shit. The castle we landed at? Bro. Bigger than a city. It was like Hogwarts, Dracula's crib, and a royal palace all had a demonic baby. I was so distracted gawking at the place I didn't even notice that Sona and the others had dipped.
MC:"Huh?"
I blinked confused
MC:"The hell did they go?"
I looked around, scratched my head, sighed like a disappointed anime protagonist, and decided to walk straight. That's where they went, right? Right??
I swear, just a few seconds ago, I was in front of the castle. But then I looked behind me.
MC:"HOW THE FLYING FUCK IS IT BEHIND ME?!"
Did I just Zoro my way through the Underworld?! Who gave me his sense of direction?!
As I was contemplating whether I needed a GPS implanted in my brain, a powerful gust of wind suddenly roared through the area. I braced myself, my coat flapping all cool-like in the wind, when BOOM!
A massive-ass dragon landed right in front of me. Huge. Red scales. Majestic horns. Glowing eyes. He looked like he was straight outta an anime intro.
MC(screaming)"Holy... SHIT. SO. BADASS!"
It was Tennin, Ex dragon King now? My guy was a devil and a powerful one at that.
Then Tennin tilted his head, clearly confused by my lack of fear and excessive enthusiasm.
Tannin (Dragon, confused): "Um... and who are you?"
I grinned, waved like I was greeting an old friend, and proudly said:
MC(smirking): "The name's Levi.
He looked at me curiously.
Tennin( Curiousl):" And why are you here then levi? Perhaps your lost?"
MC:"I'm not lost! I just... temporarily misplaced the castle entrance."
Tannin (raising a brow): "You here for the meeting, then?"
MC: "Yup. Tagging along with with my peerage. But, uh... I kinda got distracted by the castle's god-tier architecture."
I paused. Then my smirk widened. You know where this was going.
MC: "Hey, big dragon dude... got a sec?"
Tannin (wary): "Yes...?"
I cracked my knuckles. A sparkle in my eye. My goku instincts tingling.
MC: "You wanna spar?"
Tannin (blinking): "You want to fight me? A dragon?"
MC(grinning like a lunatic): "HELLS yeah I do."
There was a beat of silence. Tannin blinked a few times like his brain was buffering.
Tannin (snickering): "HAHAHA! Okay, sure! Let's fight!"
Without a second of hesitation, I pulled my arm back and launched it straight at the massive dragon in front of me—Tannin, the badass fire-breathing beast. My fist smashed against his scaled neck with a satisfying thud.
Tannin: "Huh?!"
His eyes widened, but I wasn't done. I twisted behind him mid-air like a rubber band snapping and aimed a spinning kick to his jaw.
MC (thinking): This one's gonna rattle some teeth!
But damn, that slippery bastard moved his neck just in time. My foot whooshed past him, and I lost my grip on his body, flying face-first into the ground.
MC: "OW! OW! OW! Okay... bad landing..." scratching my head while spitting dirt "Damn dragon reflexes."
He tilted his head and squinted at me like I was some circus act.
Tannin: "How did your body stretch like that? I didn't sense a hint of magic."
I chuckled and gave him a big ol' goofy grin.
MC: "Hehe... I'm a rubber boy! No magic, just physics gone wild."
Tannin (murmuring): "Rubber boy...? Fascinating..."
He grinned.
Tannin: "Alright then, let's see what else you got!"
Cracking my knuckles, I slammed a palm to the ground.
MC: "Gear Second!"

Steam erupted around me, veins glowing, muscles surging. My body blurred with speed as he swung his massive tail. I disappeared in a blink.
Tannin: "Wha—?!"
His tail cut through the air again and again, but I weaved between the strikes like a blur. Flames grazed my skin but I just laughed, charging straight for his snout.
MC: "GUM-GUM... JET PISTOL!
CRACK! My fist collided with his nose like a thunderclap.
Nothing.
Not even a twitch.
MC(frozen): "...fuck."
A fiery glow welled up in his throat. My instincts screamed.
MC: "OH SHIT!"
He unleashed a blazing fireball, engulfing me and sending my smoking butt hurtling across the field.
I bounced, rolled, coughed... and grinned.
MC (charred, smirking): "Okay, now it's fun."
I leapt into the air, my body growing larger.
MC: "Gear Third!"
My arm ballooned like a massive log, dark with Haki.
MC: "GUM-GUM... GIGANT PISTOL!!"
BOOM! The shockwave of the punch rocked the underworld, hitting Tannin square in the head. Wind howled. Dust clouded everything.
I landed and took a breath.
Me: "That had to shake his brain a little."
As the smoke cleared, I heard laughter.
Tannin: "HAHAHA! You're strong, boy!"
I blinked.
MC: "You're KIDDING ME?! Not even a nosebleed?!"
Tannin: "Come on now! Don't hold back! Show me your full strength! Let's truly have fun!"
I smiled wide.
MC: "You asked for it."
I crouched, steam and lightning sparking from my body. My muscles inflated with power. Haki covered my form, and tribal-like markings curled across my torso.
MC: "Gear Fourth... Boundman!!"
My feet bounced on the ground like springs.
MC: "You ready for round two, lizard king?"
Tannin (snorting): "Let's dance!"
MC: "GUM-GUM... KONG GUN!!"
My arm retracted like a compressed cannon and then blasted forward with explosive force. The impact was massive. Tannin skidded backward, talons tearing through rock.
Tannin (smirking): "That one tingled."
MC: "Good. 'Cause I got more!"
MC: "GUM-GUM... RHINO SCHNEIDER!"
I launched into a spinning kick mid-air, my foot infused with Haki. I slammed into his side like a crashing meteor.
Tannin: "Oof! That one... almost made me burp."
MC (sweating): "Damn tanky bastard... alright then..."
I soared up high.
MC: "GUM-GUM... LEO BAZOOKA!!"
Both arms rocketed forward, Haki-blackened fists smashing down from above.
BOOOOOOM!!
This time, Tannin staggered. A thin line of blood ran down his cheek.
Tannin (laughing): "Finally! A scratch!"
MC (panting, grinning): "Took long enough!"
We kept clashing, blow for blow. I bounced, twisted, roared. He breathed fire, swung claws the size of trees, and tail-whipped like a pissed-off kaiju.
MC(grinning mid-dodge): "You swing your fist and tail like my mom with a slipper!"
Tannin: "Then dodge like your life depends on it!"
MC: "It kinda does!!"
He roared with fire, and I countered with Haki-coated fists.
MC: "GUM-GUM KONG GUN!!!"
My fist infused with all my Haki. With a mighty yell, I slammed it down onto his head.
KA-THOOOOOM!!
The entire area quaked.
Dust. Silence.
Then... more laughter.
Tannin (emerging from rubble): "You're insane. I like you!"
A Few Moments Before the Shockwave…
In the heart of the Underworld, inside the grand obsidian hall of the Devil Kings, a high-stakes meeting was underway. Around the massive round table sat beings whose power shaped the very fabric of their realm.
Sona Shitori stood calmly, presenting her points to the Four Great Satans: Sirzechs Lucifer,Ajuka Beelzebub, Serafall Leviathan, and Falbium Asmodeus. Around them were other high-profile attendees—Azazel, the Governor of the Fallen Angels, Rias Gremory, the Heiress of House Gremory, and her peerage. Among them stood Seekvaira Agares, a poised noblewoman; Diodora Astaroth, his eerie closed-eyed smile not leaving his face; and the lizard-like noble, Zephyrdor Bael, who radiated quiet arrogance.
And one of the most badass dudes in high school dxd, The Golden King lion Sairaorg.
And outside the great hall, where the tension of politics didn't quite reach, a different crowd waited: Issei, Saji, Akeno, Koneko, kiba, Asia, Xenovia, and Tsubaki.
Then the ground trembled.
Not a minor shake. A thunderous quake that made the very bones of the castle groan.
Sirzechs snapped his head up, face sharp.
Sirzechs:"Are we under attack?"
Azazel narrowed his eyes, already preparing to summon his weapon.
Azazel:"That… felt like a damn meteor hit."
The nobles murmured in alarm, their guards stepping forward—but rias just blinked.
Rias and sona ran out to see if there peerage was ok.
Sona gasped, suddenly looking toward the doors.
Sona:"Where's Levi?"
Sona's calm face twitched. She turned swiftly to Tsubaki and Saji.
Sona:"Have either of you seen Levi since the train?"
Tsubaki shook her head quickly.
Tsubaki:"No, President. We assumed he followed us inside."
Saji scratched his head.
Saji:"He got distracted by a statue…"
Sona's eyes widened.
Sona:"No..."
They rushed outside.
Outside the Castle
They weren't prepared for what they saw.
Dust clouds were whipping in every direction. Tremors still rumbled through the ground like aftershocks from a divine punch. The trees near the castle had been bent backward, as if a typhoon had screamed past.
And there—in the sky like a living storm—was me
My body was wreathed in black and red haki. My arms ballooned like cannons, glowing with compressed power. Gear Fourth – Boundman in full swing.
Across from me hovered a legendary being—a massive brown dragon whose wings alone could blanket a mountain range.
Tannin, the Fire Dragon of the Underworld.
Rias' peerage stared in stunned silence. Kiba's jaw dropped.
Kiba:"Is… is that Levi?"
Issei squinted, then his eyes bulged.
Issei(Shocked):"HE'S FIGHTING A DRAGON!?"
Koneko blinked slowly.
Koneko:"How... is he not dead?"
Then it came.
MC:"GUM-GUM… KONG GUN!!!"
My colossal haki-imbued fist slammed into Tannin's armored snout. The explosion of force sent out a shockwave that blasted back clouds, trees, and everyone's hair like a hurricane gust. Tannin skidded backward mid-air, claws digging into the ground to stabilize.
Saji (nervously sweating): "WHY IS HE LIKE THIS?!"
Tsubaki ( deadpan): "He got bored. I guarantee he got bored."
Sona just stared at me with a shocked expression.
Meanwhile, In The Sky
Tannin exhaled steam from his nostrils, smiling wide with draconic glee.
Tannin: "You're insane, boy!"
MC(bouncing on air mid-stance): "Thanks your not so bad yourself."
With a whoosh, I vanished again in a burst of high-speed movement. Tannin swung his tail instinctively, only to miss as I shot downward.
MC:"GUM GUM: RHINO SCHNEIDER!"
My leg spiraled and slammed into the dragon's shoulder. Tannin grunted, wings shifting to stabilize himself.
Tannin: "You're faster than expected… but can you take this?"
The dragon reared back and released a massive pillar of hellfire.
I flipped mid-air, letting it blaze beneath me.
MC:"Sheesh! You trying to roast me like barbecue!?"
I launched forward again.
MC"LEO BAZOOKA!"
Twin fists collided into Tannin's chest, sending him crashing through a nearby hill.
From the Side lines, Sairaorag stood at the edge, his eyes wide as he watched me.
Sairaorage(Eyes burning with interest) " Who is he? "
Rias(Eyes wide)"He's insane."
Sona (quietly): "Levi… why are you always like this…?"
Tannin (laughing as he emerges from rubble): "Alright, kid! Let's see how far you can really push yourself!"
MC(grinning wildly): "Say less, dragon-senpai!"
He jumped back into the air, chest puffed out.
MC:"TIME TO GO FULL POWER!"
I jumped in the air and then shouted.
MC:"GUM GUM KING KONG GUN"
My fist, colossal as a mountain and crackling with raw Haki, tore through the sky like a meteor—then I brought it down full force on Tannin.
As the dust began to settle, Tannin pulled himself up, wings flaring.
Tannin (smiling): "You're the most entertaining person I've fought in decades."
I dropped out of the sky, breathing heavily.
MC(Thinking):"Already knew I was going to loss but that was fun."
I chuckled and looked at Tennin.
MC: "You ain't seen nothing yet, dragon-bro."
Everyone watching held their breath.