My name is Yukino Yukinoshita.
I'm a second-year high school student.
When I returned home from school today, I discovered a side of one of my classmates that I never knew existed.
Kisaragi Akira.
My classmate.
Top of the grade.
Excellent at sports.
And undeniably handsome.
I saw his other side with my own eyes.
He slipped a thick wad of cash into the hand of a petite, delicate-looking girl and led her into a narrow, shadowed alley.
This kind of thing… I'd heard adults talk about it before.
A so-called "compensated date."
"…."
After a brief hesitation, I followed them.
I couldn't just stand by and pretend I hadn't seen anything.I couldn't allow my classmate to ruin his life.And I couldn't watch a young girl fall into an abyss without doing anything.
My principles wouldn't allow it.
"No! Ah!"
A girl's scream echoed sharply from the alley.
"That's bad!"
I broke into a run.
Panting, I rushed forward and shouted with all the righteous indignation I could muster.
"Kisaragi Akira! Stop this illegal and criminal behavior! I've already called the police!"
"Hm?"
Akira turned his head in confusion.
In the dim alley, I could clearly see that he was wearing the uniform of our comprehensive high school.
He knew I was trying to stop him.
And yet… his movements didn't stop.
Instead, they seemed to push even deeper.
"What—!"
The girl screamed again.
"You—!"
I tried to speak, but my words died in my throat.
I was frozen in shock.
At first, I thought Akira's hand had reached her stomach.
But that wasn't it.
A hand—an unfamiliar, horrifying hand—had pierced straight through the girl's abdomen.
She groaned in agony.
Fresh blood dripped down, splattering onto the ground.
"Kill…"
I had thought I was witnessing an immoral transaction.
I never imagined I'd stumble upon a bloody murder scene.
My legs went weak.
I wanted to run—no, I needed to run—but my body refused to move, as if my feet had been nailed to the ground.
Before I could force myself to act, the girl's voice changed.
"Ah! You can see me! You can see me, right?! I—I'm going to eat you!!!"
Her neck suddenly stretched unnaturally as she lunged at Akira.
She wasn't human anymore.
She had turned into a monster.
Her mouth gaped open, rows of sharp, blood-stained teeth gleaming in the darkness.
She was trying to bite off his head.
"Don't panic."
Akira raised his hand calmly.
A terrifying power surged.
Smack!
The sound was sharp and heavy.
His slap sent the monster's head flying, smashing violently into the ground.
"…?"
For a brief moment, the monster stared at him in complete bewilderment.
Then—
I snapped back to reality.
Akira glanced at me, his expression dark and unreadable.
Then my gaze was drawn to the girl standing at the entrance of the alley.
I shuddered.
The monster was laughing madly, spouting incoherent nonsense.
"You can see me! You definitely can! I'm going to eat you!!!"
Without waiting for my response, she charged straight at me.
Her hideous face filled my vision.
"No… don't come any closer!!!"
My mind went completely blank.
Fear swallowed me whole.
My body refused to move.
I could only watch helplessly as the monster closed the distance.
My heart pounded wildly, like a drum about to burst.
My throat was dry. I couldn't breathe.
It felt like I was suffocating.
"Eclipse Thunder Form."
A clear, calm voice rang out.
From Akira's hand, a pitch-black substance—like liquid shadow—surged forth.
It spread instantly along the monster's pierced body.
In the blink of an eye, her entire form was engulfed.
The next moment—
Bzzzz—!
Black lightning erupted within the narrow alley.
The air hummed as the current tore through the darkness.
...
When the electricity faded, silence returned.
The monster's body crumbled into ash, vanishing completely.
Only Akira and I remained.
My strength gave out.
I collapsed to the ground.
My vision blurred.
It felt like I had just woken up from a nightmare.
Before I could react, Akira walked over to me.
Seeing my pale, trembling face, he looked momentarily surprised.
"Yukinoshita-san?"
I raised my head numbly, tears shimmering in my eyes.
"Y-you…"
"Shh."
I wanted to speak, but he interrupted me gently.
He pressed a finger to his lips.
Then he took off his black coat and draped it over my exposed thighs beneath my school uniform skirt.
Without another word, he turned and walked away.
Dazed, I watched his figure disappear into the distance.
Only when I tried to stand did I realize—
"…!"
My face burned red.
My ears and neck flushed.
It was wet… and cold beneath me.
...
"Doomsday Chat Group! The Doomsday Chat Group! Finally, I can invite people!"
Akira hurried home, barely able to contain his excitement.
After an entire year of silence, the chat group had finally reacted.
His ability—Five-Thunder Divine Art: Eclipse Thunder Form—was derived from the Doomsday Chat Group.
Eighteen years ago, he had been reborn from Earth.
In this world, he became an orphan.
In elementary and middle school, he'd had a classmate named Eriri.
At first, he thought this world was nothing more than a lucky reincarnation story.
Using knowledge from Earth, he made a considerable amount of money in junior high.
But after entering high school, he realized the truth.
This world was anything but ordinary.
His classmate was Yukino Yukinoshita.A beautiful upperclassman named Kasumigaoka Utaha existed.And the student council president was Kaguya Shinomiya.
It was shocking.
This was a slice-of-life anime world.
Or so he thought.
That belief was shattered a year ago, when he met a college junior named Yotsuya Miko.
A girl who could see things no one else could.
From that moment on, Akira became aware of the hidden side of the world.
The extraordinary existed.
Around that time, the Doomsday Chat Group appeared.
[The Doomsday Chat Group has detected an apocalypse in this world. Do you agree to join?]
Akira agreed.
According to its description, it was a communication platform connecting all realms to resist the end of the world.
Akira had been chosen because he had come into contact with the apocalypse itself.
To this day, he remained the group's only administrator.
The true group owner had never appeared.
Fortunately, the system still functioned.
[Doomsday Check-In][Doomsday Roulette][Ability Enhancement][Ability Recycling][Ability Visualization]
Five functions in total.
And today, the group finally changed.
[Dear Administrator, you have been granted invitation privileges. Would you like to invite members now?]
"Yes."
There was no need to hesitate.
[Invitation successful.][You have joined the chat group!]
[Apuru Party members have joined the chat!][The Water Goddess has joined the chat!][Saeko Busujima has joined the chat group!]