Chapter Text
Shibuya, ?????
????? POV
I wake up to the light of the sunrise hitting my eyes.
Groaning, I slowly sit up and rub my temples.
“Fuck… my head hurts like hell.”
My vision is blurry, and it feels like my brain is being squeezed inside my skull.
I look around.
The first thing I notice is that I’m lying on an unfamiliar bed in a room I’ve never seen before.
The second thing I notice is that I definitely do not remember coming here.
“Where the fuck am I?!”
Before I can panic any further, a translucent window suddenly appears in front of me.
I nearly fall off the bed.
“WHAT THE—?!”
The floating screen calmly displays a message.
Welcome, guest. I will be your assistant in this world.
I stare at it.
Then I stare some more.
“HUH?! This world?! I’ve been isekai’d? Wait… how did I die?”
The window flickers slightly before responding.
Well, if you mean being reborn in another world, then yes—you have been ‘isekai’d.’ As for how you died… you suffered a heart attack.
“…Huh.”
I blink.
“A heart attack? Seriously?”
Out of all the dramatic deaths possible—truck-kun, falling off a building, saving someone heroically—I died from a heart attack?
That’s… kind of lame.
“Well,” I sigh, “not exactly the death I expected. Anyway, tell me more about this world.”
The screen flickers again.
You were reborn in World 6271. However, you may also know it as the game from your world called Project SEKAI: COLORFUL STAGE!
“….”
My brain stops working.
Then suddenly—
“Hold on a minute… PROJECT SEKAI?!”
I jump out of bed.
“This is amazing! I can’t believe my luck! I got reborn in one of my favorite games!”
Well…
Technically it’s not my absolute favorite game.
But still.
Being reborn here is way better than being thrown into my all-time favorite game.
That place would probably get me killed in five minutes.
I shake my head and refocus.
“Alright, tell me about the person I was reborn as.”
The system responds immediately.
You are Yuri Asahina.
My eyes widen.
“ASAHINA?!”
Wait.
Wait wait wait.
“Hold on—what’s my relationship with… Mafuyu Asahina?”
The screen answers instantly.
Mafuyu Asahina is your younger sister.
My jaw nearly hits the floor.
Did the system really just say that MAFUYU ASAHINA is my little sister?
…
Am I dead?
Wait.
Right.
I am dead.
Which means this is real.
Which means—
I was reborn as the older sister of my favorite character in this world.
“…HAHAHAHAHAHA!”
I throw my head back laughing.
“I just won the absolute jackpot of isekai reincarnations!”
Maybe…
Maybe I can help Mafuyu.
The thought alone fills me with determination.
“System,” I say seriously, “what’s the most recent event that Nightcord at 25:00 has gone through?”
The screen responds.
‘Guiding a Lost Child to What Lies Beyond.’
Right.
That’s the event where Mafuyu’s mother—well, our mother—takes away Mafuyu’s synthesizer.
Good.
Now I have a timeline.
“And my age?”
Guest is currently 27 years old.
“…Damn.”
I slump slightly.
“I’m old”
Then again…
If Mafuyu is around seventeen right now, that means I’m about ten years older than her.
Honestly?
That might make helping her easier.
Finally, I look around my surroundings properly.
And—
“Holy shit.”
This place is huge.
Floor-to-ceiling windows overlook the city.
Modern furniture.
A massive living room.
An expensive kitchen.
“…I’m rich.”
The system confirms it.
Guest is the anonymous CEO of the technology development company “Tecimpact,” currently valued at 1.2 billion dollars.
My brain crashes again.
Because apparently—
I’m a fucking millionaire.
“A MILLIONAIRE!”
After several minutes of hyperventilating excitement, I finally calm down.
Then I notice something.
There’s a mirror nearby.
Curious, I walk over.
And when I look at my reflection—
“…Damn.”
I look good.
Like really good.
Long dark purple hair.
Sharp blue-violet eyes.
Elegant features.
And—
“…Wait.”
I lean closer.
“I look like Mafuyu.”
Not exactly the same.
But very similar.
Like an older version of her.
Same hair color.
Same eyes.
Same face shape.
Just more mature.
Can I get any luckier?
I’m rich.
Beautiful.
And the older sister of Mafuyu.
“God… if you’re the one who did this to me—thanks.”
I clear my throat.
“Alright system. Tell me about my backstory.”
The screen responds.
Yuri Asahina is the oldest daughter of Mr. and Mrs. Asahina and the older sister of Mafuyu Asahina.
Yuri ran away from home at age fourteen after being pressured by her mother.
“Fourteen! That’s fucking to young, to run away!”
I click my tongue.
“Of course.”
“So Mafuyu wasn’t the first victim.”
“That woman seriously needs some sense knocked into her.”
“Does Mafuyu even know I exist?”
The answer appears immediately.
Guest’s sister is currently unaware that she has an older sister.
Guest’s mother erased all traces of Guest’s existence when Mafuyu was four year old.
“…Wow.”
“My sister doesn’t even know I exist.”
I rub my forehead.
“Who knows about me?”
Currently only Guest’s parents are aware of Guest’s existence.
“Fantastic,” I say dryly.
“Only two people in the world know I exist.”
“Alright… what about my personality?”
Guest personality is currently [Default].
I raise an eyebrow.
“What does that even mean?”
Guest retains their original personality.
“Oh.”
“That’s actually convenient.”
Suddenly another window appears.
WORLD QUEST: [?????]
Do you want to accept this world quest?
-YES -NO
“Eh. Why not.”
I press YES.
Immediately another notification appears.
QUEST [Happy Mafuyu, Happy Life] accepted.
The happier Mafuyu is, the more rewards you will receive.
I snort.
“Ha. Jokes on you. You’re rewarding something I’d do anyway.”
The system pauses.
Then—
… CHANGING REWARDS …
“Hey! You can’t just change things like tha—”
The more quests you complete, the more rewards you will receive.
Rewards may include: gifts for Mafuyu, skills that help Mafuyu, and more.
Example Skill:
Level 1 Skill — [Spectator]
When you go to ‘work’ you become a spectator, like a ghost, allowing you to freely wander the world as a spirit until you choose to return from ‘work’.
[This skill is currently locked. Complete first quest to unlock it.]
“…You know what?”
I nod slowly.
“I actually like this change.”
“That skill sounds pretty cool.”
“So… what’s my first quest?”
The screen flickers.
All quests are hidden. You must discover them yourself.
Silence.
Then—
“You must be shitting m—!!”