"Urghhhh..."
I groaned and opened my eyes.
Huh!?
I am alive!?
Where the hell am I!?
Before I could even look around, some information hit my mind.
'Idle Transfiguration'.
'Soul'.
And then, the flashback of my previous life and death.
I was watching a video on Mahito's full potential, and then, my phone exploded.
Damn it! I shouldn't have been using that phone on charging, especially when it's battery was swollen!
After cursing for a bit, I looked around, and at myself.
I am in some sort of underground sewage. And yet, the water is pretty clear even though it is sewage water.
Am I in Japan?
I looked at my appearance. I looked like myself from my previous life, but with stiches all over my body like Mahito.
Ah.
Since I instinctively know about Idle Transfiguration, I guess I have reincarnated as Mahito.
So instead of looking like him, I actually look how my soul looks huh?
I grinned a little and changed the shape of my soul.
Blue hair, blue eyes, a pretty beautiful girl with a bodysuit like thing to cover my body since I don't want those ugly-ass clothes from Kenjaku, and with no stiches.
Woah... It's so easy to look like anything I want!
I would have tried looking like Gojo Satarou just to test my ability more, but given the low level Cursed Spirits around me, which might be Kenjaku's, I decided against it.
First, let's think about my situation.
I am now in the world of Jujutsu Kaisen, as the strongest Cursed Spirit, Mahito. I mean, not currently, but the original Mahito did become the strongest Cursed Spirit.
But the problem is that. The Strongest Cursed Spirit doesn't come close to sorcerers.
Even the peak Mahito would have died to a lot of people.
Geto, Kenjaku, Yuta, Shibuya Yuji, Sukuna, Megumi(if he used Mahoraga) and Gojo Satarou of course.
Well, it's a given since Mahito never managed to reach his full potential due to Kenjaku's plans. He was less than a year, or maybe even less than six months old. I don't remember exactly since I never paid attention to the timeline.
But there is a non-excusable fact that I, as a Cursed Spirit, am a RCT victim.
No matter how much I grow, I will never be able to reach Sukuna's level normally.
Hell, maybe Kenjaku can also output RCT outside of his body. You never know what that guy can and cannot do. His plot armour is extremely thick.
I am a Cursed Spirit, so Sorcerers will try to kill me.
I am important for Kenjaku's plan, so he will try to eat me after I have grown considerably.
Still, I am now Mahito. And I consider Idle Transfiguration to be the Cursed Technique with the most growth ceiling, even more than Ten Shadows and Copy.
Why?
Because if I can replicate the brain of someone exactly, where Cursed Technique is, wouldn't I be able to use that technique? If I can replicate Gojo's brain and eyes, I will be able to get the Six Eyes as well.
Moreover, I can have as many brains as I want. I wouldn't even need an external storage like Rika to get as many Cursed Techniques as I want.
Still... That's pretty far-fetched right now.
I don't know anything about brain. And as a newborn Cursed Spirit, my efficiency and control of Cursed Energy is pretty shit.
In any case, let's avoid catching the attention of Gojo and other Sorcerers and grow in secret. Kenjaku most likely already knows about me and might be coming soon, but I can learn many things from him. So being in contact with him for now isn't bad, since I can't really do anything about it.
I extended my hand, and grabbed a fleeing Cursed Spirit. A gross sticky thing.
Oh. It seems like my control gets weaker as I extend my body huh?
"Idle Transfiguration."
I tried to change its shape into a sphere, but it just died instead.
I was a little disappointed.
I guess its soul wasn't strong enough to endure it being messed with. Moreover, my own control isn't delicate enough for such weak creatures.
"Ah."
A trivia suddenly clicked my mind. In JJK, don't the non-living things also have souls?
I can't really see it right now. But...
"Idle Transfiguration."
I touched a pipe, and it actually bended, just as I wanted to.
Heh.
I transformed into a really small spider, and went through the pipe to get out of the sewer.
Hrmm... Am I a genius? How am I able to get used to being a spider and crawl around so easily?
Hehehe! I am great!
I continued crawling up, and arrived on the surface in a drain.
Let's see...
Closing my eyes, I tried to sense my surroundings. And I felt tiny signatures of different Cursed Energy.
I opened my eyes and looked at the signatures. They all came from weak Cursed Spirits, not humans.
So it means that no Window has spotted me.
First, let's establish a base.
It seems like an ordinary neighbourhood.
I crawled into a seemingly ordinary house, and found an ordinary old granny watching TV alone.
I guess I can start my experiments with her.
I transformed back into my human form, with wings too. Would she be surprised that an angel has appeared before her?
I came between her eyes and TV, yet she couldn't see me at all. I really am invisible huh?
I grinned and decided to scare her. I want to see how the Cursed Energy leaking out of ordinary humans react as they feel negative emotions.
I grabbed the remote, and switched the channel.
"Huh? Is remote broken?"
She switched back to the channel she was watching.
Hmm... Not really much fluctuation.
So...
I grabbed the remote, and started dangling in front of her. To her, it should look like the remote is floating.
"AAA—"
I put my hand on her mouth as she started screaming.
Now, she is totally terrified.
Her little Cursed Energy is leaking all over the place.
Still... why does it feel, fun?
Have I become twisted because of being a Cursed Spirit?
I have the urge to kill her, but I restrained myself.
"Idle Transfiguration."
I changed her shape a little, fixing her weak knees.
She didn't die from it thankfully.
"Mmph! Mmph!"
I lifted the struggling Grandma and forced her to walk.
She was walking quite normally, without any indication of pain. But, it's probably due to adrenaline, right?
Hmm...
I looked at the kidneys in her soul, and something near it has been pumping something ever since she has gotten scared.
I touched it, and put a lid on it.
Instantly, the adrenaline rush in the grandma stopped, and she became visibly calm.
I grabbed a cloth from the closet, and tied her mouth so that she wouldn't scream.
Then, took out a notebook and pen, and started writing.
"Do not make noise, or I will kill you."
She hastily nodded, but her heart was a lot calmer than before. Blood was flowing to other body parts more fluidly again, which was redirected towards muscles during the adrenaline rush.
Studying practically is really way easier and faster.
Then, with writing, I ordered her to walk and tell me whether she was having knee pain by nodding yes or no.
She walked, and was surprised that her knees were good again. She shook her head, denying any pain.
Then, I fixed her bent spine, and she stood up straight as well.
Hmm... It's tedious to talk through the notebook.
So, I grabbed her head.
I started modifying the part of brain from where the Cursed Energy was leaking, and created a tunnel for it to go into her eyes.
"Mmmph! Mmph!"
Sadly though, she couldn't take that modification, and her eyes rolled to the back of her head, and she lost consciousness.
"Oh. So this part determines consciousness huh?"
I put her to the bed, used her fingerprint to unlock her phone, and started studying about human biology. Especially the brain.
Hmm? I can actually understand all this complex stuff?
Am I a genius!? Hehehe!
Still, theoritical knowledge can't surpass practical.
So I tested everything on the granny.
Aren't I quite a harmless Curse? Unlike OG Mahito, I am not using a lot of test subjects recklessly. And it's just a granny, who will kick the bucket in no time anyway.
The strength of her soul isn't much.
So I just did precision work on her to improve myself, while also healing her in return.
She will be thankful to me when she sees me—Oops. She died.
And it didn't bother me in the slightest. Just a bit disappointment that I will have to look for another test subject.
Now, it's time to hide my traces.
I put her in the kitchen with her phone, and made a hole in the pipe connecting LPG and stove. I also shut the window.
I transformed myself into a cockroach and entered the tap, while waiting for the gas to fill the kitchen.
After enough gas was filled, I extended a hand from within the tap and grabbed the lighter.
"Bye bye!"
Saying that, I caused a fire in the house.
And as expected, fire didn't cause me any harm.
Anything that doesn't affect my soul doesn't matter to me!
Well, as long as I am not completely obliterated in one go by something like Hollow Purple.
Anyway, time to move to a different base.
I went back to the sewers, and found Kenjaku waiting there for me.
I transformed back into my human form, and walked up to him.
He will not harm me right now.
"Ah! I was looking for you. I am Geto Suguru, and I have come to you with a proposal that will be beneficial for you. I am sure that you will be interested."