ItachiVak

After causing a tech disaster in the real world, genius shut-in Rin Katsuro is sentenced by the gods and banished to Ereborn—a realm ruled by chaos, where ancient scripts control magic and dungeons feed on trauma.

He wakes up in the body of a legendary war criminal—the Demon King's General—and is mistaken for the adoptive father of a demon princess.

Armed with unstable “Error Magic” that lets him rewrite reality like code, Rin doesn’t want to be a hero... but when angels declare war on the demon races, and his daughter calls him “Papa,” he might just rewrite fate itself.

This is the story of a broken man with nothing left to live for—until an entire world starts calling him Dad, Demon, and Destiny.

I Was Banished from Heaven, Now I’m the Demon King’s Stepdad?!

The battlefield stank of holy arrogance.

Hundreds of armored knights stood at the base of the dark hill fortress, their banners flapping with the golden emblem of the Divine Empire—a sun piercing a demon skull.

From atop the tower, Rin squinted.

"Are they seriously chanting 'cleanse the unholy' like this is some fantasy con?"

Lilith clung to his arm, her horns twitching in fear.

"Papa, they came last week… They took Mama away."

Rin's jaw tightened. That wasn't just backstory. That was trauma.And trauma in this world… meant danger.

[DUNGEON CORE DETECTED][Lilith's emotional instability has activated a local Trauma Rift][Initializing Glitched Sub-Dungeon: "Sanctified Slaughter"]

Reality glitched. The air shimmered.

The entire fortress shifted—walls grew teeth, shadows twisted, and the sky turned crimson.

Rin looked around, stunned. "Bro, this castle just turned into an emo video."

"Papa… are we going to die… again?"

Her voice was so small. So raw. He knelt beside her and smiled, softly placing a hand on her head.

"Nah. Papa's got a new firewall now."

He stood up, facing the army below.

⚔️ Divine Empire Captain – Sir Vandelion the Pious

Riding a winged lion, the knight captain pointed his flaming halberd at Rin.

"You who wear the cursed armor of Valtazar, surrender the demon child! She is tainted by sin!"

Rin blinked. "Wow. You talk like a final boss before the intro cutscene ends."

[ERROR MAGIC: Code Override → HeavenStrike.exe → DENIED][Custom Script: "Sanctuary Flip" Activated]

A glitch pulse rippled across the field.

The knights' armor turned brittle. Their weapons turned rubbery. And holy enchantments short-circuited, with a divine UI flashing above them:

[Permission Denied. HeavenProtocol Rejected by Local Firewall Authority.]

"Bro, welcome to the patch notes. I'm the glitch in your goddamn code."

He stepped forward, sword in one hand, Lilith's trembling fingers still wrapped around his cape.

The sky cracked. From the Trauma Rift, a bugged-out angelic construct fell—six wings, corrupted halo, and a body half-holy, half-mechanical.

[TRAUMA BOSS UNLOCKED: "DIVINE CLEANER: 404_GABRIEL"][Warning: Boss Level exceeds local hero cap.][Recommended action: Cry]

"Lilith, remember what Papa said?"

She nodded, eyes wide. "Firewall up?"

💥 Skill Activation: "Father's Firewall – Phase One: Aggro Shift"

The moment the angel targeted Lilith, Rin's body glowed red.

He yanked all threat toward himself.The boss roared and dove toward him—ignoring every other living thing.

[You have been designated as Primary Target: 100% Threat Drawn][Passive Skill Unlocked: "Daddy Tank Mode"]

"Come at me, heaven's trash collector."

He charged. The two forces collided.

Lilith stood at the gate, trembling… then smiled, whispering:

The divine blade had pierced his side. His demonic armor cracked. Sparks flew from his sword.

The angel boss hovered above, preparing a final attack.

"You defy divinity… You protect sin incarnate… You shall be—"

[Error Detected: Code Injection: "ShutTheHellUp()]"]

"You ever try debugging a flaming trash can with wings?"

He whispered to the sword in his hand, its runes glowing.

Chapter 2 – “A Father’s First Firewall”