Simulation system

"Tatsumaki stop pampering me?!!" Hello i am Kane, i used to live in earth but i died and am now reborn as tatsumaki's younger brother. I am currently fifteen and wver since i was little i was pampered by both fubuki and Tatsumaki.

"Hmph, is it wrong to spoil my little brother, your psychic abilities may not be that strong but i will still take care of you" She said with a smile.

"That's exactly the problem! I'm fifteen now, Tatsumaki. I can handle things on my own!" I protested, trying to shake off her hand ruffling my hair.

Tatsumaki just floated a few inches off the ground, arms crossed, her usual smirk plastered on her face. "You're still just a kid to me, Kane. Besides, you're nowhere near ready to face the threats out there. I won't let anything happen to you."

I sighed, running a hand through my messy hair. "I don't need to be as strong as you or Fubuki. I can figure things out myself, okay?"

Tatsumaki raised an eyebrow, her eyes narrowing slightly. "You're part of this family, and that means you'll never have to. Not when I'm around."

Just then, Fubuki walked into the room, her signature elegance contrasting sharply with Tatsumaki's fiery presence. "Is she smothering you again, Kane?" she asked with a smile.

"Obviously," I grumbled.

Fubuki chuckled softly. "Tatsumaki, you've got to give him some space. He's growing up."

Tatsumaki huffed. "Growing up or not, he's still my little brother. It's my job to protect him."

I felt a rush of warmth from her words, but also frustration. I wanted to prove that I could stand on my own, especially in a world filled with heroes, monsters, and psychic battles. Being the younger brother of two S-class heroes wasn't exactly easy.

Fubuki gave me a reassuring look. "We'll support you, Kane, but you do need to grow stronger if you want to protect yourself. I think it's time we start training you more seriously."

Tatsumaki's eyes lit up at the idea. "Oh, now that's something I can get behind. Starting tomorrow, I'll increase your psychic training. No more slacking off."

I gulped. "Wait… I didn't mean like that—"

Tatsumaki grinned wickedly. "No excuses. You'll thank me later."

The next day, 3 hours after Training.

As i lay on the ground, i think to myself, this life i am currently leaving, it is terrifying, it is a painful experience being weighed by the concept of gravity itself given form as your big sister.

Tatsumaki was relentless in her training. She had me pinned down with just a thought, the weight of her psychic pressure enough to make even breathing difficult.

"Come on, Kane. You're not even trying," she said, hovering effortlessly above me as I struggled to move.

"I… am… trying!" I managed to grunt, my muscles trembling under the invisible force.

"You won't always have me or Fubuki around to save you, so stop relying on us!" Tatsumaki's voice was sharp, but there was concern laced within it. "If you want to survive in this world, you need to learn how to defend yourself."

I groaned, my body feeling like it was being pressed into the ground by a mountain. Why did I have to be born into such a terrifying family? Why couldn't I just have a normal sibling relationship where we fought over stupid things, not psychic abilities and life-or-death battles?

Suddenly, the pressure lightened, and I gasped for air. Tatsumaki floated down next to me, her expression softening just a bit.

"You did better today," she admitted, crouching down to ruffle my hair again. "But you've got a long way to go."

"Gee, thanks," I muttered, too exhausted to even swat her hand away.

Fubuki entered the room, her presence calming as always. "You pushed him hard again, didn't you, sis?"

Tatsumaki shrugged. "He's getting stronger. That's all that matters."

Fubuki knelt beside me, offering me a hand. "Don't worry, Kane. You'll catch up in no time. Besides, I'll take over tomorrow's training. It won't be as… intense as Tatsumaki's methods."

I accepted her hand, grateful for the reprieve. "Thanks, Fubuki. I could use a break from being crushed like a bug."

Tatsumaki rolled her eyes. "You're welcome. Tomorrow's only going to be harder, so enjoy your rest while you can."

I shuddered at the thought but couldn't help feeling a strange sense of pride. As exhausting as it was, I was growing stronger, little by little. Maybe someday, I could stand beside them as an equal, not just their little brother who needed to be protected

"Terrifying little loli, shouldn't you atleast wear decent clothes in front of your bro" i suddenly blurted out.

Tatsumaki froze mid-air, her expression turning from smug to deadpan in an instant. Her eyes narrowed, and a chilling aura filled the room. "What did you just say?" she asked, her voice dangerously low.

I gulped, realizing I'd just stepped on a landmine. "I-I mean, it's just… you know, something a bit more… um… modest?" I stammered, trying to backtrack before I got crushed—again.

Fubuki chuckled softly, covering her mouth with her hand. "Oh, Kane, you're really brave for saying that."

Tatsumaki descended to the ground, her fists clenched, but instead of launching me into the stratosphere like I half expected, she smirked. "Well, if you're going to get picky about what I wear, maybe I should make tomorrow's training a bit more 'decent'—with double the gravity." She winked at me, but the menace behind the wink was all too real.

I waved my hands in a panic. "No, no! It's fine! Totally fine! Forget I said anything!"

She crossed her arms, satisfied with my frantic apology. "That's what I thought. Now, get some rest before you embarrass yourself again."

Fubuki helped me up, shaking her head with amusement. "You really need to learn how to pick your battles, Kane."

I sighed, exhausted and defeated. "Yeah, no kidding."

As we walked out of the training room, I couldn't help but think that between Tatsumaki's ruthless training and her terrifying ability to crush my spirit, I'd never get a break in this family. But at least I had Fubuki on my side… for now.

As i went back to my room something suddenly appeared in front of me.

[Ding the Multiverse Simulation system has activated]

[Ding! Congratulations, Kane. You have been selected as the user of the Multiverse Simulation System. This system will assist you in your journey to become stronger by simulating battles, training, and events across multiple universes.]

I blinked, trying to process what was happening. "Multiverse… simulation? Is this some kind of game?" I muttered to myself, half-expecting this to be a dream brought on by my exhaustion.

Suddenly, another screen popped up.

[Would you like to begin your first simulation? Yes/No]

I hesitated. What was going on? This wasn't normal, even in a world filled with psychics and monsters. My mind raced with questions. Was this real? Could it help me become stronger?

Tatsumaki's voice echoed in my head, reminding me of today's brutal training session. If there was a way to catch up to her and Fubuki, this might be it.

With a deep breath, I pressed Yes.

The room around me started to blur, as if reality itself was being stretched. The floor vanished, and I was suddenly standing in a blank, endless space. A voice echoed in my mind.

[Welcome to the Simulation Room. A random simulation will be picked red, you will have 1 white level trait, let me explain the system's mechanics to you.]

[In the Multiverse Simulation System, you'll face battles and challenges from various universes. Traits will enhance your abilities, ranging from basic white level to legendary golden level. You'll start with a white level trait for your first simulation. As you progress, you can gain stronger traits and abilities.]

My mind spun as I processed the information. "So… this system is like some kind of RPG for the multiverse?, okay let's start"

[Pick one Trait.]

1.Basic comprehension:You're ten times better at comprehending things.

2.Cat Man: You often act like a car.

3.Pet:You will become someones pet]

I choose one, there is no need to think about that.

[Demon slayer universe has been chosen, beginning simulation]

[You wake up in a forest, You realize you are fifteen and have your psychic abilities. Suddenly behind you, a man with six eyes looked down at you]

[You realized it was one of the twelve Kizuki, Upper Moon One, Kokushibo.Knowing your situation you knelt down and beg]

Damn, i didn't even start and i am already meeting a boss level character, thankfully this is a simulation and i am not actually there.

Though i want to see what happens..

[Kokushibo finds you interesting, he offers you to become a demon and you can be free, or you could die, at this moment, you though about those monsters roaming in your world. you wondered if your sister would ever kill you if you became one]

They won't, those to won't get rid of me unless i actually commit countless death crimes.

[Thinking that, you nodded your head at his offer, The next moment you felt something prick your bech and then you fell asleep]

"Wow, i can't control this simulation or wven command it but the fact that i am a coward hurts my pride a bit…" i said disgruntled.

[You woke up to find yourself in the infinity castle, You raised your hands looking at your now pale hands and felt your hair reach your back, your vision was split in three as your realize you had a third eye that looked strange]

Damn, is it that bad?.

[But you realized that is all that changed, your psychic ability was still there since it was naturally connected to your mind, Kokushibo looked at you as if studying a strange specimen, he asked you to rip your arm off and make a weapon for yourself, but the more longer the weapon the more flesh it uses]

"…"

[You didn't hesitate as you tore of your limbs and made a scyhthe]

[The pain was excruciating, but you managed to form a scythe from the severed limb. As you wielded it, you felt an odd sense of power, mingled with the agony of your transformation.]

[Kokushibo observed you with a mixture of curiosity and approval. "Not bad. Most demons would falter at the sight of their own blood. But you seem to be adapting well."]

[Kokushibo then decided to teach you moon breathing , Mzan kibutsuji watched you two train and then he decided to give you his blood making you stronger that the strongest lower moon]

"Damn generous bastard"

[After months of training, you have completwly mastered moonbreathing, Your Blood demon art was basically an enhance to your psychic abilities, you call it the third eye]

[After a while, you were sent out to do a mission by muzan, You were sent to kill a demon slayer in a nearby town, when you went there in the night, you were suddenly discovered by two hashira's, Sanemi and Rengoku]

[The three of you fought and then after some hours of struggling, you were unfortunately overwhelmed and killed]

[You died]

[Generating Rewards, Pick 2]

[1. Demon flesh Scythe and Moon breathing(Mastered)]

[2.Enhanced psychic abilities.]

[3.Become a lower Moon demon]

"Pick one and 2"

[You chose "Enhanced psychic abilities" and "Demon flesh Scythe and Moon Breathing (Mastered)."]

[You receive your rewards: Your psychic abilities are now significantly enhanced, giving you greater control and power. Additionally, you gain the Demon Flesh Scythe and the mastery of Moon Breathing.]

[Simulation ends. Returning to the real world.]

The room around me solidified once more, and I found myself back in my own room, the eerie, disorienting void of the simulation now a distant memory. I looked down at my hands and was relieved to find them normal. The Demon Flesh Scythe and enhanced psychic abilities were real, tangible rewards.

I glanced at the Multiverse Simulation System's interface, now dim and inactive. It had given me a challenging trial and offered significant benefits. I couldn't wait to see how these new skills would impact my training with Tatsumaki and Fubuki.

Just then, I heard a knock on my door. It was Fubuki, her concerned expression softening when she saw me.

"Are you alright? I heard you mumbling in your sleep," she said.

"Yeah just a nightmare" i said not alerting her.

"Oh i'll tell tatsumaki, she will immediately come and sleep with you so you won't be lonely" before i could retort she was already gone.

I sighed, still feeling the weight of the simulation's trials and the physical remnants of the scythe and enhanced abilities. Fubuki's well-meaning intervention, though it came with a touch of her usual overprotectiveness, only added to the jumble of my thoughts.

As the door creaked open once more, Tatsumaki floated in, her expression a mix of concern and annoyance. "Fubuki told me you had a nightmare," she said, her tone softening slightly as she approached me. "I'm here to make sure you're okay."

I was about to protest when Tatsumaki sat down next to me on the bed, her usual air of superiority replaced by an almost tender concern. "I don't need a babysitter," I began, but her eyes were focused on me with genuine worry.

"I'm not here to babysit you," Tatsumaki said firmly. "I just want to make sure you're alright. And if you think you can handle everything on your own, remember that even heroes need to rest."

I felt a strange mix of emotions. Part of me was irritated by her persistence, but another part was comforted by her presence. "Thanks, Tatsumaki," I said quietly, lying back on the bed. "I guess I could use the company."

Tatsumaki's expression softened further, and she adjusted her position to sit more comfortably. "I know you're trying to prove yourself, but don't forget that you're not alone. You've got us. Even if we push you hard, it's because we care."

I nodded, closing my eyes. "I understand. It's just… hard to keep up sometimes."

She reached over and lightly ruffled my hair. "We all have our struggles. But you're stronger than you think. And if you need a break, I can always give you one—after you've finished training, of course."

I chuckled despite myself, feeling a bit more at ease. "Alright, deal."

"Thanks now come here" she slipped into the bed and then forcefully put his head on her chest. I felt the warmth of Tatsumaki's presence as she guided my head onto her chest. The familiar sound of her heartbeat was oddly soothing amidst the chaos and stress of my recent experiences.

"Just don't get too used to this," Tatsumaki said, her voice soft but carrying a hint of her usual teasing tone. "You still have a lot of training ahead of you."

I managed a small smile, closing my eyes as I let myself relax for the first time in what felt like forever. "Got it. I'll make sure to keep pushing myself."

Tatsumaki's fingers gently ran through my hair. "Good. And remember, even though I'm hard on you, it's because I believe in you. You're capable of more than you know."