Fluffy Fluffy School Days: The Hellhound Sisters' Tail Operation
Fluffy white dog ears and fluffy tails—twin sisters Fuwawa and Mococo wake up one morning in a strange Japanese house. "Where are we?" "I don't know." They have tiny horn-like bumps on their heads and tails, but otherwise they look like ordinary girls. In truth, they were once hellhounds guarding the world of the deep abyss. Now, that power is completely gone.
They take the family name "Abyssgard" and start attending a local school. Fuwawa is the calm older sister; Mococo is the energetic young
Fluffy Fluffy School Days: The Hellhound Sisters' Tail Operation - A Fluffy Awakening and the First Step
"...Where is this?"
When she opened her eyes, she was staring at an unfamiliar ceiling. Wooden planks were neatly arranged above her, and the room was a Japanese-style one — old, but well cared for. The scent of tatami tickled her nose. Soft morning light filtered through the window, and somewhere in the distance, a bird was singing.
She sat up. The futon was plush, and the white sheets felt pleasant against her skin.
(Where... am I?)
Fuwawa looked at her own hands. Slender, pale fingers. Then long hair spilled over her shoulders. Fluffy white hair, long and flowing, with light blue streaks woven through it here and there.
Something felt off.
Her head felt strangely heavy. And there was a peculiar sensation around her lower back.
"Sis...?"
From the futon beside her, her little sister Mococo stirred and sat up. Fluffy white short twin-tails with pink streaks. Her sparkling pink eyes looked over sleepily.
"Good morning, Mococo."
"Mornin'... Hey, where are we?"
Mococo tilted her head. As she did, the dog ears on top of her head gave a little bounce.
Fuwawa froze.
(Ears...?)
Mococo had fluffy white dog ears growing from her head. And that wasn't all. On the futon, a fluffy tail was swaying gently back and forth.
Fuwawa nervously reached a hand up to her own head.
She touched it.
Fluffy.
No mistake about it. She had dog ears too. And near her backside as well. A tail. She could move it at will.
And then, on her forehead — one more thing. A small horn tapped against her fingertip.
"...What is this?"
Her voice trembled. Her heart was pounding, and her mind was going blank.
But beside her, Mococo just looked puzzled.
"Whoa! Sis, you've got ears! They're so fluffy! Can I touch them?"
"Huh...? Oh, um, sure."
Mococo happily reached out and touched Fuwawa's dog ears. It tickled, and she couldn't help but hunch her shoulders.
"Amazing, amazing! You've got a tail too! Sis, your tail is so big and fluffy — the best!"
"M-Mococo, calm down a little..."
Then Mococo noticed her own ears and tail, and her eyes sparkled even more.
"I've got them too! We match, Sis! Yay!"
Mococo bounced up and down on the futon. Her tail wagged furiously, stirring the air around them.
Watching her little sister, Fuwawa felt herself calm down just a little.
(If Mococo's smiling... then maybe it's okay.)
But there was so much she didn't understand.
She knew their names. Fuwawa and Mococo. She also somehow knew they were twin sisters.
But everything else — she couldn't remember a thing.
Where this place was. Why they had these ears and tails.
"Sis, I'm hungry."
Mococo said, holding her stomach.
Fuwawa couldn't help but let out a small laugh.
"I know. ...Let's go see if there's something to eat."
The two of them stood up.
In the corner of the room was a full-length mirror. Fuwawa stared at her reflection.
Fluffy white long hair with light blue streaks. Clear, light blue eyes. A slender figure. A white blouse with a light blue ribbon, and a navy pleated skirt.
At some point, she'd ended up wearing what looked like a school uniform.
On her head, sure enough, dog ears. On her forehead, a small horn. Behind her, a large tail swaying gently.
(What... am I?)
Something stirred deep in her chest.
But she couldn't show a worried face in front of Mococo. She was the big sister.
Fuwawa gently hugged her own tail in front of the mirror. It was fluffy and warm.
"...It's okay. It's going to be okay."
She murmured softly, as if convincing herself.
—That was when it happened.
"Oh, so you're awake."
The sliding door opened, and a small elderly woman stood there.
Her white hair was tied back, and she wore a deep green kimono. Her posture was straight and dignified, giving an impression far younger than her years. But her eyes were incredibly kind.
"W-Who are you?"
Fuwawa instinctively shielded Mococo behind her.
"My name is Itsuko. Itsuko Abyssgard."
The old woman — Itsuko — smiled warmly.
"This is Ashinohara City. This is the house where you two will live from now on."
"Ashinohara... City?"
The name didn't ring any bells.
"Ashinohara City! What a cute name!"
Mococo peeked out from behind Fuwawa's back.
Itsuko chuckled and settled onto a cushion.
"Now then, you two. Right now you don't understand anything about yourselves, and you're anxious, aren't you?"
Fuwawa nodded silently. Mococo nodded vigorously too.
"I'll tell you what I can."
Itsuko began to speak slowly.
"You two were originally hellhounds of the deep pit world — Naglfar."
"Hellhounds...?"
"That's right. Beneath this world spreads a vast hollow realm called Naglfar. It was the hellhounds' duty to protect humans from the black mist called the 'Erosion' that leaks from it."
Fuwawa looked at her own ears and tail.
Hellhounds.
Part of her thought, I see. Another part couldn't believe it.
"Your ears, your tails, the horns on your foreheads — those are what remain of that."
"Then why are we here? Who are you, Grandma?"
Mococo asked honestly.
"I am from a family that has quietly preserved the history of the hellhounds. You two lost your power and awoke in this house as human girls. That's all there is to it."
"Lost our... power?"
"Yes. You no longer have the power to purify the Erosion. You're just ordinary girls now."
Itsuko's voice was gentle.
"From now on, take the surname Abyssgard. Abyssgard means 'guardian of the abyss.' ...But for now, use it as nothing more than a family name. You don't have to protect anything anymore."
Those words settled quietly into Fuwawa's chest.
You don't have to protect anything anymore.
Did that mean they were free to take it easy? Or did it mean they'd lost their purpose?
"...School. I've completed the transfer paperwork for Ashinohara Elementary. You can start tomorrow."
"School!? We can go to school!?"
Mococo's eyes sparkled.
"Of course you can. I've prepared your uniforms too. For today, both of you rest up."
With that, Itsuko stood.
"Dinner is at six. Until then, do as you like."
The sliding door closed.
Silence returned to the room.
Fuwawa still couldn't quite believe any of it.
They'd been hellhounds. They'd protected the deep pit world. But now they had no power.
And tomorrow, school.
"Sis! School! School! I can't wait!"
Mococo flung herself at Fuwawa. Her fluffy tail wagged furiously.
"Yeah. ...But do you think we'll be okay?"
The honest thought slipped out.
Mococo looked up at Fuwawa's face intently.
"As long as I'm with you, Sis, we'll be fine anywhere!"
Those words warmed Fuwawa's heart.
"...Thank you, Mococo."
Fuwawa gently stroked Mococo's head. The dog ears twitched ticklishly.
(I'm the big sister. I have to protect my little sister.)
Fuwawa resolved this firmly in her heart.
—The next morning.
The two of them put on their uniforms. White blouses — Fuwawa with a light blue ribbon, Mococo with a pink one. Navy pleated skirts.
"Sis! Does it look good? Does it?"
Mococo spun around in front of the mirror. Her skirt flared softly, and her tail swayed along with it.
"It suits you perfectly. You're adorable."
"Ehehe. You look amazing too, Sis! Like a model!"
The two of them left the house.
The air outside was autumn. Cool and clear.
Ashinohara City was a quiet town. Berry fields stretched out, and mountains were visible in the distance. Red and yellow fallen leaves danced along the road in front of the house.
"Wow, the air is so tasty! It smells like berries!"
Mococo sniffed at the air.
Fuwawa took a deep breath too. A sweet, slightly tart berry scent rode on the wind.
Ashinohara Elementary was about a fifteen-minute walk away.
Passing through the school gate, they heard the voices of many children.
"...There are so many people."
Fuwawa instinctively stopped in her tracks.
Everyone was staring at their ears and tails.
"Sis, are you okay?"
Mococo squeezed Fuwawa's hand tightly.
"...I'm fine. Let's go."
They greeted their homeroom teacher in the staff room and headed to the classroom.
Standing in front of the classroom door, they could hear voices buzzing inside.
"—Today, I'd like to introduce some new friends."
The teacher beckoned them into the classroom.
Fuwawa's heart was pounding.
They entered.
Nearly forty children's eyes turned toward them all at once.
Everything went silent.
Everyone was staring at Fuwawa and Mococo's ears and tails.
(Ah... I knew it. We're weird.)
Fuwawa tried to hide her tail, but she couldn't, so she just stood there.
"Sis..."
Mococo was nervous too.
But Fuwawa stepped forward.
"I'm Fuwawa Abyssgard. Nice to meet you all."
She gave the best greeting she could, trying to keep her voice from shaking.
"I'm Mococo Abyssgard! Nice to meet you!"
Mococo said it loudly too.
Silence.
One second, two seconds, three—
Clap clap clap clap!
Suddenly, applause erupted throughout the classroom.
"Whoa, your ears are so cute!"
"Your tails are fluffy!"
"They're real!? Amazing!"
Cheers rose from all around.
Fuwawa felt the tension drain from her shoulders.
(...Thank goodness.)
No one was laughing at them.
Everyone was just purely, curiously, but warmly welcoming them.
Fuwawa and Mococo's seats were in the very back by the window. They sat side by side.
"Sis, I'm so glad."
"...Yeah. Me too."
Fuwawa looked out the window.
In a corner of the schoolyard, there was a patch lush with green leaves. Red and purple berries glistened there.
(A berry patch...)
Mococo was looking at the same thing.
"Sis, look! Berries! They look so yummy!"
Mococo pressed herself against the window. Her tail wagged furiously.
Watching her, Fuwawa naturally broke into a smile.
(A normal school life. I want to have that.)
Fuwawa wished for it from the bottom of her heart.
—Lunch break.
The two of them had come to the berry patch in the corner of the schoolyard.
Berry bushes stood in neat rows, heavy with red and purple fruit. A sweet-and-sour fragrance drifted through the air.
"Waaah! Amazing! They look so good! Sis, look! This one's huge!"
Mococo ran up to a berry bush.
That was the moment.
Their tails glowed gold — just for an instant.
Fuwawa looked at her own tail.
The light was already gone.
But something stirred deep in her chest.
As if something was calling to her.
As if something bad was nearby.
"...What was that just now?"
Mococo was too absorbed in the berries to notice.
Fuwawa placed her hand on the ground.
The cool soil.
From beneath it — far, far below — she sensed some kind of presence.
—Deep underground.
Directly below Ashinohara Elementary, about fifty meters down.
A massive vertical shaft thirty meters in diameter — the Mouth of Olvein.
At its bottom, black mist moved slowly.
As if responding to the two of them.
But Fuwawa didn't know what it was.
Only the stirring in her chest remained.
"...Mococo, let's head back to the classroom soon."
Fuwawa acted as if nothing had happened.
—After school.
When they got home, Itsuko had gone out shopping and wasn't there.
Fuwawa went to the backyard.
There was an old well.
A stone well with a wooden lid.
Fuwawa gently slid the lid aside.
She peered inside.
Dark.
A deep darkness that seemed to go on forever.
And then—
From the bottom of the well, she could see black mist slowly seeping out.
"...!"
Fuwawa instinctively backed away.
The mist swayed and drifted, rising little by little.
Something bad.
Her intuition was screaming it.
"What... is this?"
Her voice trembled.
"Sis? What are you doing?"
She turned around to see Mococo standing there with a worried look.
"Mococo... you were there."
"I thought you seemed kind of off. ...Hey, what happened?"
Fuwawa hesitated.
But when she looked into Mococo's eyes, she couldn't hide it.
"...Black mist is coming out of the bottom of the well. It seems like something bad."
Mococo peered into the well.
Then she squeezed Fuwawa's hand tightly.
"If yo
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