Tokyo – Rented Apartment
Arthur groggily opened his eyes, slowly waking up.
"Ugh... so bright. I must've forgotten to close the curtains last night..."
The sunlight pouring straight through the window stung his eyes, but he was too lazy to get up and pull the curtains shut. Instead, he simply turned over onto his side and continued to immerse himself in dreamland.
"It's my day off today—no one gets to disturb my beauty sleep."
Arthur intended to fall back asleep, but his stomach betrayed him with a loud rumble, protesting its emptiness. Left with no choice, he drowsily sat up and began slowly getting dressed.
Yawning, he muttered to himself, "Haaah~ Today marks the 68th day since I transmigrated into the world of Chainsaw Man, and also the 68th day of my deepening hatred toward the goddess Eris."
Yes, Arthur was a transmigrator. Sixty-eight days ago, while walking home, he was suddenly transported to another world without warning.
A flash of white light appeared, and the beautiful goddess Eris manifested before him.
With a gentle smile, she said to him,
"Mr. Arthur, you've transmigrated."
"...Huh?"
"Mr. Arthur~ The world you're going to isn't just any ordinary other world~ It's a crossover world made up of many anime universes~ And also..."
Eris elegantly extended her slender fingers, lightly pinching the hem of her skirt and lifting it just a little to reveal her pale, dainty bare feet. She tiptoed closer to Arthur, leaned in toward his ear, and breathed out a soft, tingling whisper.
"And also~ this other world is entirely made up of women. Not a single man exists there~ Even those who were originally male characters in their respective anime have all become beautiful women in this world~"
"Your mission is to uncover the truth of this world and ultimately defeat the powerful Demon King. So? Are you ready? Let's begin!"
Ignoring Arthur's questions, Eris clapped her hands. A flash of white light surged—and Arthur vanished on the spot, transmigrating in the blink of an eye.
It had been 68 days since then.
Rubbing his eyes and still yawning, Arthur got out of bed to make breakfast—only to find the refrigerator empty. That's when he remembered he'd eaten the last of it last night.
"Tch... So annoying. Guess I'll have to go to the convenience store for something to eat."
After a quick cleanup, Arthur left the apartment.
"Let's hope today goes smoothly like usual. Please don't let me run into another demon outbreak in broad daylight..."
This world was far from ordinary—after all, it followed the Chainsaw Man setting, a world where humans and devils coexisted.
In the past 68 days, Arthur had encountered two devil rampages: one by the Cucumber Devil, and another by the Eel Devil. Both were grotesque beyond sanity and oddly powerful, scarring his innocent heart deeply.
Scenes like those were something only a Hollywood-level horror production could bring to life in such twisted, disturbing fashion.
After grabbing a few items at the convenience store, Arthur stood at a street crossing, waiting for the traffic light. His gaze wandered toward the massive department store not far away—Keio Mall.
"Man, this traffic light is so slow."
—BOOM!!!—
Suddenly, an enormous explosion rocked the mall. A deafening blast shook the air. A massive mushroom cloud rose into the sky, darkening the heavens above.
The shockwave roared like a hurricane, slamming into Arthur with such force that his clothes flapped violently and slapped against his body.
Screams erupted all around him as panicked people ran in every direction.
"Shit! Just my luck! A demon outbreak in the middle of the day?!"
From the flaming ruins of the mall, a huge shadow suddenly burst forth into the sky. It was clearly injured, with deep red wounds all over its body. Against the blazing fire, it looked utterly monstrous.
"The Bat Devil!"
Arthur immediately recognized it.
The Bat Devil wobbled through the sky, its wingbeats erratic and weak. But on one of its massive claws...
Arthur squinted.
Someone was hanging from it!
It looked like someone from the Public Safety Devil Extermination Division. Judging by her gear, she had stabbed her weapon into the Bat Devil's claw and was clinging to it with both hands, suspended in midair.
Eventually, the Bat Devil lost strength, and both it and the woman plummeted toward the ground.
Arthur glanced at the fleeing crowd, then at where she was falling. Gritting his teeth, he dashed toward her.
Soon, he found her amidst the rubble.
"Wait... Aki Hayakawa?!"
Arthur cried out in shock. Just as Eris had said—this world wasn't just all-female; even originally male characters had become women.
This woman carried traces of Aki Hayakawa's figure, but when she lifted her head and revealed her delicate, soft face, Arthur knew instantly—it was a gender-swapped Aki Hayakawa.
The leather tie she'd used to keep her hair up was gone, her long hair falling messily to the ground. Several heavy stones pinned her body down, her face twisted in pain.
Arthur rushed over and began pushing the rubble off her.
"Hey! What do you think you're doing?! Civilians need to evacuate immediately! It's dangerous here!"
"Shut up! I'm here to save you!"
Suddenly—a thunderous boom! The Bat Devil, which had seemingly disappeared, once again took flight and appeared in the sky.
Its grotesque, deformed head turned rapidly—and locked eyes with Arthur.
"Y-YoU DaMn ReBeLs! I'll EaT tHe SoUtH gAtE wHoLe!!"
It spoke with a grotesque slur, then flapped its wings and divebombed toward Arthur at terrifying speed.
Arthur had no time to run. He couldn't escape. Even if he hadn't tried to save her, it was too late—he was in the line of fire either way. He gritted his teeth, gave one last shove to move the rocks, and reached for Aki Hayakawa's hand.
[Ding~ Fatal danger detected. Roleplay Transformation System activating~]
[Ding~ Main character Aki Hayakawa encountered for the first time. +3 points.]
[Ding~ Detected Aki Hayakawa's feelings of guilt. +20 points.]
[Ding~ Beginner Gift Pack unlocked. Choose one 3-minute experience card from three blonde anime/game male characters.]
[Fate: Artoria Pendragon]
[Genshin Impact: Dainsleif]
[Konosuba: Dust]
But there wasn't time to save her! The Bat Devil's deadly presence loomed over him, jaws wide open.
Arthur turned around, and in that moment, he could clearly see the Bat Devil's massive fangs and the thick, disgusting slime inside its maw.
"Run!!"
Aki Hayakawa stretched out her arms, trying to push him out of the way.
[Ding~ Detected Aki Hayakawa's anxiety. +5 points.]
"I choose Artoria Pendragon!"
[System confirmed. Beginner Gift Pack activated. Roleplay transformation commencing.]
A dazzling golden light burst from Arthur's body, instantly engulfing the entire area.
The light was so powerful, it struck the Bat Devil and sent it flying.
Aki Hayakawa instinctively shielded her eyes from the brilliance.
Within that beam of golden light, Arthur's body began to float gently. A silver-white suit of armor materialized around him...