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Isekai’d as a Useless Support Character (But My Slime Loves Me)

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Synopsis
In the sacred kingdom of Elysera, under a sky blessed by twin suns and songs of angels, the Great Holy Ritual of Summoning was finally completed. A blinding pillar of light exploded at the center of the Grand Cathedral. The High Saintess Seraphiel, a woman of divine beauty and infinite patience, stepped forward with grace. Beside her stood the Female Chosen One, a young warrior with a silver sword and an expression sharp enough to cut demons. The light faded, revealing their long-awaited savior. The Male Chosen One. But what emerged from the divine light… was not what they expected. A young man in ragged pajamas, holding a manga in one hand and mumbling something about “panty shots,” stood blinking in the holy chamber. "HOLY CHOSEN ONE!" Seraphiel announced, her voice echoing through the stained glass halls. "Yo," said the man, scratching his butt. "Wait, is this… an isekai? SWEET! Are there elves?" Seraphiel, maintaining her saintly calm, bowed slightly. "Brave one, your destiny is to defeat the Demon King and save our world—" Before she could finish, the Male Chosen One turned and locked eyes with the Female Chosen One. Then—without hesitation—he lunged forward and tried to lift her skirt. Time seemed to slow. A hush fell across the cathedral. SLAP! The sound echoed like divine thunder. THWACK! A well-aimed kick launched the pervert into a stained glass window featuring the image of a benevolent angel. He crashed through it and landed in the holy fountain. "B-BUT THAT’S HOW IT STARTS IN THE MANGA!" he sputtered, coughing water. The Female Chosen One, glaring, muttered, “That’s the Demon King, right? We summoned the wrong guy.” Seraphiel pinched the bridge of her nose and sighed. “...Perhaps fate has a sense of humor.” And so began the chaotic journey of a very perverted "hero", a holy saintess barely holding it together, and a Female Chosen One who seriously considered joining the demon army instead.
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Chapter 1 - Pervert Companion

Inside an ancient cathedral where the air smelled of incense and ancient magic, rows of candles flickered from their holders tucked into stone corners. Their flames danced gently, illuminating towering stained glass windows and marble statues of winged guardians.

At the heart of it all stood a stunning woman — the Holy Saint Arlena — clad in flowing silver robes, her long hair cascading like starlight. She held a ceremonial rod crowned with a glowing orb, her expression serene yet focused.

Tonight, destiny was to unfold.

She raised her staff high.

The ancient summoning circle etched into the cathedral floor began to shimmer, drawing lines of glowing blue light with a life of their own. Symbols — old and forgotten — etched themselves midair, one by one, circling above her like a halo of runes.

Then, they began to rotate, spinning faster and faster until the light turned blinding.

Fwoooosh—!

With a gust of wind and a burst of white smoke, two figures emerged at the center of the circle.

Arlena's staff lowered slightly. Her brows furrowed.

That… wasn't supposed to happen.

The first figure flopped forward lazily, a thin teenage boy holding a comic book in one hand and wearing loose pajamas covered in cartoon animals. His eyes blinked blearily under unkempt hair. He looked like he had just woken from an afternoon nap.

On the other side, stepping with grace, stood a girl — her black-over-white school uniform glowing faintly under the floating runes. Her posture was elegant, her face surreal — beautiful in a way that felt like dream and reality had collided. The very sight of her could make men fall back and women hide their insecurities.

And then…

The boy rubbed his eyes, spotted the girl beside him, and grinned like a fool.

He muttered under his breath, "Yeeeah... I wanna see wifey's bikini now…"

Plop! He plopped onto the stone floor like a goblin in heat, nose bleeding, face flushed, a silly smile plastered across his face as if he had reached enlightenment.

The Holy Saint stared, jaw slightly open.

And then came the loud, scandalized shout:

"WAIT—!! My secret collection! Who stole my book?! That thing was signed!!"

The comic book had vanished, burned away by holy magic the moment it touched sacred ground.

The girl stepped away from him in disgust.

Meanwhile, Arlena's hand trembled around her staff.

"...This ritual was only meant to summon one person. The female Chosen One. Not… not… that."

She looked down at the boy now lying flat, nose still bleeding and whispering something about "elf maid cafés." Her voice cracked as she whispered,

"What in the Goddess's name... did we just bring into our world?"

The boy blinked slowly, rubbing his eyes as he looked around the cathedral. The tall ceilings. The candles. The glowing summoning circle beneath him. His gaze finally settled on the breathtaking woman with a glowing staff — Saint Arlena — who stared back at him in a mix of shock and horror.

He gasped.

"An ancient magical cathedral... a woman with a glowing stick… Am I the chosen one?!"

His face lit up with sudden clarity. He puffed out his chest and stood tall — or tried to, but his loose pajamas sagged a little.

"Yes. Yes! I knew it!" he declared triumphantly. "I was born for greatness!"

He raised one fist like he was about to give a heroic speech to the gods themselves—

And then his eyes drifted sideways.

There, just a few feet away, was the girl.

A modern schoolgirl, in a perfectly neat uniform: white shirt, black blazer, pleated skirt, and long socks. She was brushing off her sleeves, trying to understand where she was.

His jaw slackened.

"Whoa..." he whispered, leaning closer like a hyena spotting food. "A schoolgirl? In another world too? And that skirt… short. Is this my reward for being the chosen one?!"

His fingers twitched.

His nose bled again.

Then — madness.

With absolutely no hesitation, he lunged forward like a wild raccoon and grabbed the hem of her skirt.

"Let me just see if there's lace or—"

SLAP!!

The sound rang like a thunderclap.

BAM!!

Followed by a roundhouse kick straight to his jaw.

The boy flew backward and crashed into a column, crumpling like laundry.

The entire room fell into silence. Even the flames of the candles flickered in stunned disbelief.

The girl, fists clenched and face red with fury, growled, "Do that again, and I'll break your neck."

Saint Arlena could only stare at the boy's twitching body as he groaned something like, "Wife material confirmed…"

She whispered under her breath:

"This… is not the chosen one. This is a divine accident."

An hour Later

Saint Arlena stood frozen, her radiant staff dimming slightly as reality began to settle in.

Two summons.

Only one expected.

One destined.

And the other…

"What… is this creature?" she finally muttered, looking down at the boy now drooling slightly and mumbling about "catgirl priestesses" and "forbidden yuri scrolls."

The girl, brushing imaginary dust from her uniform sleeves, looked around and frowned. "Excuse me—where exactly am I? Also... who is this idiot?"

Arlena blinked, forcing herself into composure. "You are in the Great Cathedral of Elyria. You were summoned here by the Divine Ritual of Stars. You... are the Chosen One."

The girl paused. "Me?"

"Yes. You."

The girl looked down at the glowing symbol beneath her feet. It pulsed in harmony with her heartbeat. Her brows furrowed, but she didn't argue.

She looked at the Saint, then at the sprawled pervert in the background. "And he?"

Arlena looked like she had just bitten into soap. "He... is a clerical error."

"I heard that," the boy muttered from the floor, dazed but smiling. "Hey, Miss Magic Lady, can I get a blessing? Like... Female Hypnosis? For... science?"

Arlena turned to him, her voice strained. "You are in the presence of sacred flame and starlight, and you speak of... enhancements?!"

He slowly stood up, rubbing his cheek and groaning. "Okay okay... not enhancements. Maybe just a peek. Just a little—"

BOOM!

A small fireball exploded at his feet.

He leapt back, yelping. "HEY! You almost hit the goods!"

The girl raised her hand, palm still smoking from the spell.

"Try again, and I won't miss."

He blinked. "You can cast magic?"

"I just did."

He gulped. "That's hot."

Arlena cleared her throat, trying desperately to redirect the conversation back to divine matters. "Ahem! Sacred Chosen Girl, your name, if you please?"

The girl straightened. "Hoshino Rika. Second year. Class 2-B. Top of my school. And that," she pointed a sharp finger at the boy, "is not my classmate."

The boy raised a lazy hand. "Yo. I'm Jin. Kazuki Jin. Professional napper, collector of waifus, and president of the Underground Culture Research Club. That last part's unofficial though."

Rika stared at him, eyes full of judgment.

Kazuki gave a peace sign. "Nice to meet ya, fellow isekai buddy."

Rika turned back to Arlena. "Can I be unsummoned? Please?"

Saint Arlena sighed. The stars above must've been drunk.

"Unfortunately," she said, "the ritual cannot be undone. You are here until the prophecy is fulfilled."

Rika crossed her arms. "And what about him?"

Kazuki smiled. "I'll help! I'm ready to protect you! I've seen hundreds of anime. I know how this works."

He took one step forward and tripped on his own pajama pants.

Rika looked down at him coldly. "So… the fate of the world depends on me. And he's just here to ruin the vibe."

"Basically," Arlena muttered, rubbing her temples.

Kazuki rolled over and pointed dramatically at the saint. "Mark my words! I'll prove I belong here. I'll train, I'll fight, I'll—"

His gaze dropped again.

"…And maybe I'll just follow that skirt."

WHAM!

Another kick to the jaw. This time, it left a tooth spinning midair like a shooting star.