Narrator's POV
[The world of Dandadan is vaster than Jujutsu Kaisen's, there's no debate, kid. Dandadan's universe is better.]
"Who's this idiot? He doesn't even understand the difference between vast and better?" An overweight man complained in front of his phone while munching on chips.
This man was Alex, an individual known as an otaku.
Alex was having an ordinary sick day when a notification on T*ktok caught his attention.
A user had responded to a comment where Alex was discrediting Dandadan's universe by comparing it to Jujutsu Kaisen's.
If Alex had been a normal person, he would have just ignored the comment, blocked the individual, and gone about his day. But Alex wasn't like that.
He was a "keyboard" warrior. So he launched into a debate that seemed to have been going on for hours with this mysterious individual.
[I know how we'll settle this situation. I'm going to send you into Dandadan's universe, at the beginning of the story.]
After reading this message, Alex was first surprised before bursting into laughter.
"Another one who believes they're their own username... Seriously, who would call themselves Random Eldritch God?" Despite mocking the individual, Alex decided to play along.
He had to prepare food soon, so he preferred the debate to stop, even if he hadn't been able to impose his opinion.
Alex nevertheless showed his approval of the idea from the internet user calling themselves Random Eldritch God.
[I knew you wouldn't be a coward. Now, tell me: what power would you like to have from the JJK universe?]
At first, Alex wanted to write Gojo, but he quickly stopped.
A question came to his mind at that moment: who has the scariest talent in JJK?
Names quickly came to his mind: the first was Sukuna, the second Yuji Itadori, the third Mahito, fourth Megumi, and the last Yuta.
After a period of hesitation, he wrote that he preferred to have all of Mahito's abilities, including those specific to cursed spirits.
[It'll be slightly adapted to Dandadan's world, but you'll be able to do everything he could do in JJK.]
"Goodbye, Mr. Enlightened One. I hope you'll bother someone else *bam*" Alex didn't finish his joke before his phone violently exploded.
....
"Shit, my head's spinning," said Alex as he got up despite his headache.
"What?!" Alex found himself in an unknown classroom. Its style resembled that of Japanese high schools he saw in manga.
"What's this thing?" A paper had just fallen on him.
[No, I'm not enlightened and no, I won't bother someone else since I'm not done with our little debate.] After that, the sheet started burning before disappearing.
"Damn, I should've chosen Sukuna," whispered Alex. He had chosen Mahito on a whim and now he would have to face spirits and aliens with formidable powers.
Alex began to observe the class more carefully. It didn't take him long to recognize this universe's protagonist.
(Image)
"Oh! He seems unable to see me for now," he noted, remembering that ordinary people couldn't see spirits, except under certain conditions.
And it seemed that, for now, Alex didn't meet these conditions with Okarun.
"He must not have much spiritual energy without Turbo Granny. I better explore elsewhere for now." He left Okarun to get harassed by papers thrown at him and began to move around the high school.
Alex didn't really have any other goal than surviving to win his bet, but the idea of being in a manga excited him a bit.
"Too bad I'm not in JJK like Mahito." *Sigh* He consoled himself by saying that at least he had superpowers now.
While walking in the hallway, Alex met an extremely familiar face.
"This girl must surely be Kouki Yukishiro, she'll be perfect for making my mark among humans for now" he headed toward her before transforming into a bat and landing on her shoulder.
(Image)
He didn't know exactly how he controlled his cursed technique but, if he had to describe it, it would be like using a body part.
It's purely instinctive and natural. The moment Mahito landed on Kouki's shoulder, she had a slight shiver before relaxing under Alex's influence.
"It's honestly easy to manipulate hormones in the brain with Mahito's power but, I should be careful not to break her" under Alex's impulse, Kouki slowly fell asleep.
A few hours passed and people started emptying the room.
"Uh... classes are over already?!" she got up hurriedly to prepare to go home.
Alex stayed on her shoulder throughout the process, he wanted to get used to this form since he would use it often in the future.
'Strange, I haven't slept this well in a long time' Kouki's gloomy face seemed to have regained some color.
Once at her home, Alex just observed the place until the young girl lay down on the bed.
"Let's see if I can really make something useful out of you or if I should just look for someone else," whispered Alex while placing his paws on Kouki's lower abdomen.
Alex intended to unblock Kouki's chakras, kind of like how the aliens had accidentally done with Momo Ayase.
"If I remember correctly, the energy must accumulate in the belly before coming out through the top of the head." Alex began trying to control the energy emanating from Kouki's soul using his cursed technique.
At first, his control over his cursed technique was clumsy, but he slowly improved throughout the process.
Nothing happened during Alex's act on Kouki, except that the young girl's pale complexion improved slightly.
"I must have missed a detail, otherwise Momo's grandmother would also have psychic powers, and they wouldn't depend on the gods." While thinking, Alex recalled what the aliens had said.
"They talked about brain overstimulation. At the time, the aliens had used their telekinesis to manipulate Momo Ayase's brain waves and made her excited." Having realized this, Alex used Momo's grandmother's strange technique on Kouki thanks to his own cursed technique and stimulated the young girl's brain to make her excited.
He felt slightly uncomfortable seeing a teenager rubbing her thighs with excitement, but he forced himself to focus on his mission.
He might be an evil spirit now but, Alex remains a man of principles despite his meager amount of experience in these particular departments.
*Boom* A psychic explosion occurred in the room.
"Am I bleeding?" Alex wondered, because Mahito was immune to physical damage, but special attacks touching the soul could reach him.
This situation reminded him of Turbo Granny's explanation about the aura or essence that all beings in this reality possess.
'It seems this explosion contains spiritual energy or aura. I should be wary of psychic power holders from now on'
"Who are you?" Kouki had regained her bearings after the overstimulation caused by Mahito's power.
She seemed to have successfully acquired psychic powers, as Alex wanted.
"I'm Mahito. I'll come back to see you later, and don't forget... you're no longer alone, Kouki, because I heard your prayers~" Alex flew out the window after hearing footsteps approaching from outside the room.
Although invisible to common mortals, Alex preferred to give Kouki time to digest the situation and her new powers.