Gravity User of the Abyss Guard: Fuwamoco and the Irregular Transmigrator
High school second-year Kaito Amano was swallowed by a vortex of light on his way home from school. When he wakes up, he finds himself in a world of floating islands and deep misty valleys. The ones who discover him are twin guardians with fluffy white hair and dog ears—Fuwawa and Mococo.
Fuwawa is the calm older sister with light blue eyes. Mococo is the energetic younger sister with pink eyes. They say in unison: "This is the boundary of the abyss, the domain of the Abyss Guard!"
In this wor
Gravity User of the Abyss Guard: Fuwamoco and the Irregular Transmigrator - Dog-Eared Twins: A Promise Exchanged at the Abyssal Boundary
The mist drifted slowly.
White haze crept along the ground, occasionally swirling into eddies despite the absence of wind. Countless floating islands hung in the sky, and between them stretched deep valleys of fog. Somewhere in the distance, Kaito thought he heard a low, beast-like growl, and he unconsciously hunched his shoulders.
Until moments ago, he had been in a residential neighborhood in Japan.
Rain-soaked asphalt. An old man's unfocused eyes. The wail of an ambulance siren. And then—a vortex of light.
(Where... am I?)
Kaito sat on the cold earth, staring at his right hand. A faint trace of golden light lingered at his fingertips. When he had slammed that black monster into the ground earlier, an invisible force had definitely surged from this hand.
(Gravity... manipulation?)
There was no way he could possess some power straight out of a manga. But what had happened before his eyes was real. That tentacled creature had been crushed into the ground and dissolved into black mist.
"...Damn."
Kaito muttered under his breath.
That was when it happened.
"Found you!"
A buoyant voice echoed from beyond the fog.
Kaito looked up and saw a white figure running toward him. It was a girl with fluffy white hair tied in twin-tails. Perched atop her head were perked-up dog ears, and a fluffy tail swayed behind her. Her pink eyes widened the moment they landed on him.
" Wow, you really are human! Big Sister, look, look! Black hair! Dark brown eyes! He's completely different from us!"
The girl bounced up and down, then began circling Kaito. Her tail wagged furiously with every movement.
"Mococo, calm down."
Another voice spoke.
When Kaito turned toward it, the air seemed to warp, and a second girl appeared. Her long, fluffy white hair was tied back with a light blue ribbon. She had the same perked-up dog ears, and her eyes were a calm shade of aqua.
(Twins...?)
The two looked remarkably alike. Only their hairstyles, eye colors, and overall demeanor differed—their facial features were nearly identical.
The girl called Fuwawa stopped in front of Kaito and bowed politely.
" Nice to meet you. I am Fuwawa Abyssgard, Guardian of the Abyss Guard. This is my younger sister, Mococo."
" I'm Mococo Abyssgard! Nice to meet you, Kaito-kun!"
"Kaito... kun...?"
Kaito was confused. He hadn't introduced himself yet. So why did she know his name?
" I know about you from the summoning records. Amano Kaito-san. You came from another world, didn't you?"
"Summoning...?"
" Yep! Kaito-kun was called here to save our world! Isn't that amazing?"
Mococo spread both arms wide, beaming.
"Hold on. I'm not following any of this."
Kaito stood up and looked at the two of them directly.
"First—where is this? Why can I understand what you're saying? What's this about a summoning?"
" I'll explain in order."
Fuwawa spoke in a composed voice.
"This is Yggdrasiel. A world where countless floating islands span the sky. There is no ground. People build cities and settlements on those islands and live there. And filling the space between the islands are those deep fog valleys—the Mist Veil."
Kaito looked up at the sky.
Floating islands. Deep fog. A giant white tree.
"Touching that mist erodes your memories. That's why traveling from island to island requires crossing barrier-protected bridges, riding wyverns, or having a Guardian as an escort."
"Wyverns..."
" Yep! Wyverns are how people get around in this world! They slice through the wind when they fly! It feels amazing!"
Mococo spread her arms like wings and fluttered them.
"...So why can I understand your language?"
" Because you were granted the Blessing of Language Comprehension during the summoning. You can speak, hear, and understand the language of this world. And conversely, we can understand yours."
"A blessing..."
Kaito stared at his own palm.
"Then that power from before—is that part of this blessing too?"
At those words, Fuwawa's expression clouded for just a moment.
" ...That was gravity manipulation. The gravity of another world that resides within you. A special power that exists outside the laws of this world."
" Amazing, amazing! So that's the gravity of another world! You took out a Void Spawn in a single hit—Kaito-kun, you really are incredible!"
Mococo grabbed Kaito's right hand with both of hers and stared at it intently.
" Oh, it's glowing here! There's golden light running through it like cracks!"
On Kaito's right hand, faint golden cracks of light remained, running from his fingertips to his wrist.
The moment Fuwawa saw that light, she pressed her lips tightly together.
(This light... just as I thought. It's exactly as the records said.)
Deep in Fuwawa's chest, guilt pricked at her like a needle.
But she couldn't let it show on her face.
" ...It's dangerous here. We're close to the boundary of the Abyss. That Void Spawn from earlier was a monster that crawled out from the Abyss. There's no telling when another will appear. I'll take you to our base, Lumina Port. Please follow me."
"Lumina Port...?"
" It's the biggest floating island city in this world! The Abyss Guard headquarters is there, and the Star-Viewing Tower too—it's so beautiful! Kaito-kun, you're going to be amazed!"
Mococo tugged at Kaito's hand, trying to get him to start walking.
" Mococo, don't rush him. Kaito-san was in a different world until just moments ago."
" Aww, but I wanna show him Lumina Port so bad..."
Mococo's ears drooped slightly.
Seeing her like that, Kaito felt a little of the tension leave his shoulders.
(These two aren't enemies.)
At least, not right now.
"...All right. Let's go."
Kaito said that and started walking.
" Yay! Then Mococo will lead the way! Kaito-kun, follow me!"
Mococo bounded forward.
Fuwawa walked alongside Kaito and spoke quietly.
" You don't have to push yourself. You were in another world until just moments ago. It's only natural to be confused."
"...No, I'm fine. More importantly, tell me about this world. Everything."
"Yes. Of course."
Fuwawa gave a small nod.
The three of them began walking down a narrow path shrouded in mist.
The surroundings were barren—white rocks and withered trees stretching on endlessly. Every so often, black mist rose from the ground, forming the shape of a person before dissipating.
" What is that...?"
Kaito stopped in his tracks at the sight of the black mist.
" Residue of the Abyss. It's like a precursor to a Void Spawn appearing. It hasn't materialized yet, so it's harmless for now. But it's best not to get close."
"Void Spawn—is that the monster from before?"
"Yes. It's a general term for monsters that crawl out of the Abyss. There are humanoid types, beast types, amorphous ones—all shapes. They devour fragments of memory from anyone they touch and numb their emotions. Physical attacks barely work on them; only gravity manipulation or barrier magic can bind their physical form."
"They devour... memories..."
The image of the old man collapsed at the rainy intersection flashed through Kaito's mind.
(That man wasn't having his memories eaten. But I still couldn't do anything.)
" But you know, Kaito-kun's gravity manipulation works on those monsters! You saw it earlier, right? You took one out in a single hit! Even regular Guardians can't usually do that!"
Mococo turned around and said happily.
"...I don't really understand that power myself. I just did it without thinking."
" That's fine. You can learn to understand your power little by little. Don't rush it."
Fuwawa's voice was calm and somehow warm.
Kaito glanced at Fuwawa's profile.
(This person... she's like my big sister.)
That's what he thought.
After walking for a while, a bridge came into view ahead.
"That's the Barrier Bridge."
Fuwawa pointed.
It was a thin bridge glowing white. Barely a meter wide, with no railings on either side. Below it stretched a deep fog valley. The bottom was invisible. Only white haze continued endlessly.
"This bridge is protected by barrier magic. As long as you're on it, the mist of the Mist Veil can't touch you. But if you fall... there's no saving you."
" If you fall... what happens?"
" You fall into the Abyss while the mist devours your memories. The bottom is nothingness."
Fuwawa's voice was quiet and cold.
Kaito swallowed hard.
" It's okay, Kaito-kun! Mococo will hold your hand! I've crossed this bridge tons of times, so I'm used to it!"
Mococo gripped Kaito's hand tightly.
It was a small hand. But it was warm and strong.
"...Thanks."
Kaito thanked her honestly.
The three of them began crossing the Barrier Bridge.
The bridge swayed more than he'd expected. With each step, he felt like his feet were floating. Looking down, white mist swirled below, creating the illusion that he might be sucked in.
(Stay calm. Just look forward.)
Kaito fixed his eyes on Fuwawa's back and advanced carefully.
It was when they reached the middle of the bridge.
"—!"
Fuwawa suddenly stopped.
"What's wrong, Fuwawa?"
" ...They're coming. From below."
Fuwawa's voice went rigid with tension.
The next instant, the mist beneath the bridge warped.
Black mist swirled and gathered. It formed a human shape, then arms, then a head—three Void Spawns crawled up onto the edge of the bridge.
" Whoa...!"
Kaito's legs froze.
(Not them again...)
The memory of the earlier attack flashed back. The sensation of black tentacles coiling around his ankle. Cold, slimy, horrifying.
His body wouldn't move.
" I'll protect Kaito-kun!"
Mococo leaped in front of Kaito.
" Mococo, don't be reckless!"
Fuwawa cast healing magic from behind. A pale light enveloped Mococo's body.
Mococo lunged bare-handed at one of the Void Spawns.
" Hah!"
Her fist punched through the black mist body. The Void Spawn wavered but didn't fall.
" I-It's hard...!"
The second one's tentacle grazed Mococo's arm.
" Kyaa!"
Mococo lost her balance and was driven to the edge of the bridge.
"Mococo!"
Fuwawa screamed.
The scene from the rainy intersection surged back into Kaito's mind.
The collapsed old man. His unfocused eyes. His fingers barely moving. Back then, Kaito hadn't been able to do anything. He'd run to call an ambulance, and by the time he returned, it was already too late.
(Am I going to lose someone again?)
(Right in front of me, unable to protect them?)
(Just like that time?)
—No.
"U-Uwaaaaaah!!"
Kaito thrust out his right hand desperately.
Something surged up from deep within his body. Golden light erupted from his fingertips, shaking the air.
"—Fall!!"
Gravity was unleashed.
The Void Spawn that had been reaching out its tentacles was crushed into the bridge as if slammed by a giant hand.
GYAAAAAAAA!!
With a death scream, the black mist scattered.
" One more...!"
Kaito thrust out his left hand too.
"Fall, fall, fall!!"
The remaining two were slammed onto the bridge one after another.
DOOOOON!!
The impact shook the bridge violently.
The Void Spawns dissolved into black mist and vanished.
Silence returned.
Kaito dropped to his knees.
"Hah... hah... hah..."
His breathing was ragged. Sweat poured from every pore.
Then, a sharp pain shot through his right hand.
"Guh... aaaah!"
Golden cracks of light raced from his fingertips to his elbow, and a pain like being pierced through his entire body struck him.
"Kaito-san!"
Fuwawa ran over and cast healing magic on his right hand. A pale light enveloped his arm.
But the crack of light didn't disappear.
"...It won't disappear."
Fuwawa bit her lip.
" Please, don't push yourself anymore."
Fuwawa's voice was trembling.
Kaito was startled by that voice.
(Fuwawa is... shaking?)
"...Where's Mococo?"
Kaito endured the pain and raised his head.
" Kaito-kun... Kaito-kun!"
Mococo, tears in her eyes, flung herself at Kaito.
" Kaito-kun protected Mococo...! Thank you, thank you...!"
Mococo's body was trembling slightly.
Kaito gently placed his hand on her head.
"...I'm glad you're safe."
Those
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