Tajima Sanzo had just experienced the most humiliating day of his life—and that was before he got isekai'd.
Earlier that morning, he had been a completely normal (read: lonely) 19-year-old college student, enjoying his routine of skipping classes, grinding gacha games, and daydreaming about being the protagonist of his own OP isekai harem adventure. But that dream had been shattered the moment his professor caught him watching adult videos in the middle of a lecture.
That was how he got kicked out of university.
And now? Now he stood in the middle of a damp, dark basement, his body glowing with the fading embers of a summoning spell. His heart pounded as he processed what just happened. The intricate glowing runes around him, the floating system interface in front of his face, and the sheer vibe of the place all screamed one thing:
"Holy shit, I got isekai'd!!"
Tajima's eyes widened as pure joy exploded inside him. His time had finally come! After years of watching trashy isekai anime and reading countless web novels, he knew exactly what came next.
Step one: Get summoned to a fantasy world.
Step two: Receive broken OP powers.
Step three: Build a harem of cute girls.
Step four: Become the strongest and defeat the Demon Lord.
He grinned like an idiot, fists clenched with excitement. "I-Is this really happening? Am I the chosen hero!?"
The system interface flickered to life in front of him. A deep, ominous voice boomed throughout the basement, dripping with ancient authority.
[WELCOME, 669TH DEMON KING.]
Tajima froze.
…Wait. What?
Tajima's brain tried to reboot.
Demon King? Not hero?
His grin slowly vanished, replaced by a nervous chuckle. "W-Wait, there's been a mistake, right? I'm supposed to be the OP protagonist with a harem! Not—"
Before he could finish, the system voice rudely continued:
[AS THE 669TH DEMON KING, YOUR DUTY IS TO DEFEAT THE HERO AND RESTORE THE GLORY OF DEMON KIND.]
[…WARNING: DUE TO THE LOSS OF 668 PREVIOUS DEMON KINGS, YOUR DOMAIN HAS BEEN REDUCED TO A SINGLE TERRITORY.]
[CURRENT DEMON KINGDOM SIZE: 1 (ONE) SHACK.]
Tajima's jaw hit the floor. "Huh!?"
A bright light flashed, teleporting him instantly out of the basement and into broad daylight—
—where he immediately realized how screwed he was.
Before him stood his entire domain.
A single, rundown shack.
No castle. No army. No grand throne. Just a wooden shack so poorly built that it looked like a light breeze could wipe it out.
Tajima's eyes darted around. The "land" he ruled over was nothing but a tiny, empty field surrounded by a dense forest, with zero signs of civilization nearby.
His legs wobbled.
"…This is a joke, right?" he muttered, turning his gaze to the sky. "Where's my demon army!? My castle!? My dark city!?"
Silence.
Only the sound of the wind gently shaking the broken wooden door of his shack.
The floating system screen popped up again, as if enjoying his suffering.
[DEMON ARMY: 0]
[DEMON TERRITORY: 1 (SHACK)]
[AVAILABLE STAFF: NONE]
Tajima stared at the numbers. His soul left his body.
"Even a Level 1 slime gets better starting conditions than this…"
Tajima took a deep breath. "No, it's fine. This is just the starting phase. Any second now, my legendary demon powers will awaken!"
With newfound hope, he opened his status screen. It was time to check his cheat skills.
[STATUS]
NAME: Tajima Sanzo
TITLE: 669th Demon King – "Tajima the Useless One"
LV: 1
STRENGTH: 2
DEXTERITY: 1
MAGIC: 0.5
LUCK: -100
SKILLS: [Gacha OP]
Tajima's entire body convulsed at the sight of his title.
"'Tajima the Useless One'!?!? Oi, who decided this!?"
As if to rub salt in the wound, the system interface added a new notification:
[SYSTEM NOTE: THIS TITLE WAS CHOSEN BASED ON A CAREFUL ANALYSIS OF YOUR LIFE ACHIEVEMENTS.]
"Stop analyzing me!!"
Furious, Tajima focused on his only skill, [Gacha OP].
The name alone sounded overpowered as hell. Gacha? OP? That meant infinite legendary summons, right!?
Excited, he clicked on the description.
[Gacha OP]
Description: The ultimate summoning skill, capable of calling forth anything from mythical beings to legendary weapons…
…But to activate it, the user must fulfill the "Sacred Requirement."
Tajima froze.
"…Sacred Requirement?"
Before he could question it, a new system message popped up.
[TO ACTIVATE GACHA OP, PLEASE SHOUT THE FOLLOWING PHRASE OUT LOUD:]
"OH GREAT AND MIGHTY GACHA GOD, BLESS THIS PATHETIC FOOL WITH POWER!"
Tajima's soul shattered.
"W-Wait… You mean I have to say… THAT!?" His face turned bright red.
The system did not care.
[NOTE: FAILURE TO SHOUT THE PHRASE IN A LOUD, DRAMATIC VOICE MAY RESULT IN INCREASED HUMILIATION REQUIREMENTS.]
His hands clenched into fists. He was already on the verge of breaking.
But he had no choice. If this skill really was OP, then he needed it.
Taking a deep breath, he spread his arms dramatically and shouted:
"OH GREAT AND MIGHTY GACHA GOD, BLESS THIS PATHETIC FOOL WITH POWER!!!"
The air trembled. The sky glowed with divine light.
Something materialized before him.
Tajima braced himself.
This was it—the moment of his legend!
The light faded… revealing…
…a single, confused chicken.
Tajima stared at the chicken.
The chicken stared back.
The system delivered the final blow.
[CONGRATULATIONS! YOUR FIRST SUMMON: A SLIGHTLY ABOVE-AVERAGE CHICKEN.]
Tajima fell to his knees.
His journey as the most pathetic Demon King in history had begun.
To be continued…