In Demon Slayer, Nezuko might just be the most overpowered character.
As a demon, she didn't need to eat humans, didn't have to train, and didn't even rely on Muzan's blood. Her power grew while she slept.
One nap and she went from a normal demon to Lower Moon(Rank) level.
Another nap? Boom—Upper Moon(Rank) strength.
No structured training, no intensive battles—just instinctual combat, and yet she posed a threat to nearly anyone.
Eventually, she even overcame the demon weakness to sunlight, surpassing Muzan himself.
And her Blood Demon Art? Practically the nemesis of all other demons.
It used her blood as a medium—able to burn away other demons' arts, neutralize their effects, and inflict heavy damage that even halted regeneration.
On top of that, it worked perfectly with Nichirin swords.
During a battle, Tanjiro once used a Nichirin blade coated with her blood. The sword turned into the legendary red blade wielded by Sun Breathing users, its power greatly enhanced.
However, the art consumed a huge amount of her blood—her very life force—so it couldn't be used often.
Otherwise, she could probably go full-on demon slayer herself.
Souta's idea: What if they removed that blood-consumption limitation?
Could her Blood Demon Art evolve into a massive AoE (Area of Effect) attack?
Just blast away and incinerate any enemy blood art on the spot.
And the solution was simple: Make it so Nezuko could generate that special blood endlessly.
"Bone marrow creates blood, but probably not the same type as Muzan's demonic blood. I can use divine power to reconfigure Nezuko's marrow to produce that specific blood."
"And of course, the production speed has to be amped up. She should be able to generate dozens—maybe hundreds—of kilos of blood in an instant, or the AoE plan won't work."
"Also, blood creation requires energy. I'll enhance her marrow with an ability to absorb and store massive amounts of energy. Charge for 5 minutes, fight for 2 hours."
"But... a fighting style entirely based on blood loss? That's kinda creepy."
As Souta let his imagination run wild, the group chat buzzed to life.
Shiroyasha: "Oh? Another one's asking you for a power-up? What kind of crazy idea this time? Hehe, I'm looking forward to it."
Altair: "@Souta. Who is this Muzan Kibutsuji that Nezuko wants to defeat?"
Souta: "It's a long story. I'll just upload the plot memory of Demon Slayer as an experience product. Should only cost 1 point. I'll transfer the points to you guys—just use them to buy and watch it."
Altair: "No need to transfer points. I asked, I'll pay for it myself."
Souta: "Altair, come on. If you use the points I send you, they come right back to me. But the memory stays with you. That's what we call free real estate. Got it?"
Shiroyasha: "Classic Souta. Never change."
Kurumi Tokisaki: "A~ra, the system's really complicated, huh? Souta, don't bully it too much, okay?"
Rin Tohsaka: "The system chose the wrong guy to be group leader."
Illya: "Big brother, you're so mean~ but I like it, hehe."
Seriously? Wasn't he just using the system efficiently?
How did it become some kind of criminal act in their eyes?
Souta: "Alright, uploading the memory now."
[Souta has uploaded a product: Demon Slayer Plot Memory.
Product Type: Experience.
Description: Watch to understand the full plot of Demon Slayer.]
He glanced at the store. Price: 1 point—just as expected.
After all, these memories were just stories. They didn't offer direct combat power, so they were cheap.
As for intel—anyone in the group could come to his world to investigate. No real barrier there. Price couldn't be higher if he tried.
"Divine power really is convenient. Even vague memories can be recalled in full clarity. Saves me from having to rewatch the whole show before uploading."
After transferring points to those who needed them, nearly everyone in the friend group—except Luo Hao—now knew the plot of Demon Slayer.
Nezuko: "God-sama, is that... my future?"
Souta: "Not anymore. From the moment you got the invitation, your future became unpredictable."
Souta: "Still, that information should be very useful to you."
Chelsea: "That Muzan... seriously deserves to die. So many tragedies, all because of him."
Rin Tohsaka: "So he's the root of it all. Yeah, definitely gotta kill him."
Kurumi: "I agree with that sentiment."
Altair: "He's a threat to the newbie's world. Eliminating him seems logical."
Reading Altair's comment, Souta felt a strange sense of irony.
One of the former world-ending villains calling Muzan a threat felt... weird.
And Nezuko wasn't even new anymore—she'd been in the group for a while now.
Altair: "What's wrong? Souta, you have something to say?"
Souta: "Nothing. I just think Kurumi should focus more."
Souta: "@Kurumi Tokisaki. Kurumi, concentrate on absorbing power. Don't chat while leveling. If something goes wrong, you might go berserk."
Kurumi: "Got it, got it. You worry too much."
Rin Tohsaka: "@Souta. Why didn't you just go take Muzan out yourself? Wouldn't it be easy for you?"
Souta: "It would. But I figured Nezuko might want to take revenge herself. So I held back."
Shiroyasha: "He's a small fry anyway. Can take care of him anytime. But enough of that—what's your plan for powering up the newbie? I'm more curious about your new idea."
Souta: "You might be disappointed. My idea this time is simple—enhance Nezuko's Blood Demon Art. The Demon Slayer world isn't like Date A Live. There's not much to build on."
He explained the bone marrow rework and the whole "bleed-to-fight" concept.
Shiroyasha: "Honestly? I think it's still creative. I'd never have come up with such a bizarre solution."
So he was bizarre now?
Chelsea: "I imagined the fight scenes and... pfft. Sorry, I laughed."
Souta: "Chelsea, don't laugh your head off."
Chelsea: "Hmph, your teasing doesn't work on me anymore. Even if I do lose my head, I can just grow it back."
Kurumi: "I just loaded a No.4 Bullet into my gun."
Was Kurumi threatening her? Were they teaming up to pick on her now?
A No.4 Bullet couldn't hit her through worlds... could it?
Altair: "The bleed-style is a bit weird, but against demons, it's brutally effective. I think this power-up plan is decent. Though, it has its flaws."
Altair: "Using blood attacks only disables other blood arts and slows regeneration. Offensively, it's limited. She might still struggle to take on Muzan solo."
Rin Tohsaka: "Agreed."
Rin Tohsaka: "And didn't they say Muzan can only be killed by sunlight? Nezuko's blood might not be enough. She probably needs a sunlight-based attack."
Athena: "Hmph, sunlight? How boring."
Athena: "I can simply imbue enemies with death itself. Since I just earned some points, I'll help this time for free."
Altair: "Athena-sama, you might've missed it earlier—Nezuko wants to take revenge herself. We're discussing how to empower her."
Souta: "Actually... Athena just gave me an idea on how to give Nezuko a way to strike at Muzan directly."