Yandere Sister?

I knew it—there was something fundamentally wrong about this world!

Now I get why Kaguya was acting so horny, practically throwing herself at me, simping like her life depended on it.

It all makes sense why Ai, too, was so aggressive, eagerly willing to cross any boundary, even commit incest without a second thought.

In the end, it wasn't them who were at fault, but this world itself—warped on a whole other level, drenched in its own perverted logic.

What's considered common sense here would be seen as batshit insane back in my old reality.

It's fucking crazy, absurd beyond belief.

But did I feel repulsed by it?

Did I feel even a shred of disgust?

Hell no, I didn't.

In fact, this twisted reality was paradise for me.

A world where every woman, regardless of her status, begs, pleads, and goes to great lengths just to earn the privilege of my presence.

Unlike in my past life, where I had to buy lavish gifts, prove my worth, build my wealth, and practically grovel at the feet of beautiful women to avoid being cheated on after marriage—here, I don't need to do any of that.

In this world, all the heroines I once saw as mere pixels on a screen, now real and desperate, easily throw themselves at me.

I don't face any of the challenges of seduction or maintaining a relationship.

There's no need for any of that.

None whatsoever.

This world is beyond awesome.

Sure, the women here might be aggressive, hornier than I've ever encountered, and even downright rapey at times, but do I care?

Not in the slightest.

It probably sounds fucked-up to say this out loud, but I don't give a damn.

I thrive on the intense emotions they show me. I don't want lukewarm affection or half-hearted gestures. The more intense, the more possessive, the more desperate they are for me, the better it is.

It means one thing—they will never betray me. I despise betrayal more than anything, and I've lived a life where I've felt that sting too often. Every fiber of my being rejects it.

The screen in front of me continued flashing, revealing more than just the benefits of this world—it showed me the dangers lurking beneath the surface.

Not every woman here is loving or affectionate.

There are those who are abusive, who see men as nothing more than toys or mere breeding machines.

The higher their position, the more they exploit their power to get whatever they desire.

The small population of men in this world only worsens the situation. Their sexual endurance and capabilities are pathetically weak. Just a single milking session, and they're left utterly drained, needing a week to recover.

It leaves most of the women unsatisfied, teetering on the edge of desperation.

Of course, they can force themselves on these men, but the result?

The poor bastards get drained dry, sometimes to the point of death—a miserable, humiliating death.

If this were a typical modern reversed world, you'd expect the government to intervene, to try and put a stop to this madness.

But here?

Here, strength rules above all.

Only the powerful get to own and keep their men, while the weak have no choice but to fend for themselves.

In the end, if a woman doesn't have the strength to protect her man, he'll be snatched away by someone more powerful who takes a fancy to him.

That's just how this world works.

The world government's grip on the population is tenuous at best. The only real imperial power left functioning is Princess Hatsune Miku.

But she's just one individual, and while she might be the legitimate ruler of Japan, she isn't the most powerful player in the game.

Far from it.

The world isn't run by politicians or governments, but by powerful guilds.

Most of their members aren't loyal lapdogs of any government—they answer only to their leaders.

This is the reality I've found myself in—a chaotic, lawless playground where strength dictates everything, and every woman is willing to do whatever it takes to keep their hands on me.

It's a far cry from my old life, and I'm not sure I ever want to go back.

Yes, to put it simply, this world operates under a matriarchal system.

While men in this world might receive better treatment compared to the historical past of our own world, their fates largely depend on which women take an interest in them.

Most women display kindness and care, but there are a few who exhibit abusive tendencies, treating men as mere playthings to satisfy their desires.

If you are unfortunate enough to encounter one of these predatory women, then consider yourself unlucky—it's a roll of the dice, and the odds are not always in your favor.

Despite the seemingly improved societal treatment that men receive, there remains an undercurrent of violence, especially when women do not receive the affection or responses they desire from the men they fancy.

The aggressive behaviors exhibited by women include stalking, blackmail, and, in the worst cases, rape.

Take Kaguya Shinomiya as an example: she treated the former owner of this body like he was her most treasured possession, showering him with gifts and affection that could overwhelm even the most stoic of men.

But when all she received in return were caution and distrust, her response escalated to coercion and violence, as though demanding repayment for her own misguided generosity.

Every woman in this world has a limit to her patience.

They may initially appear generous and even doting toward the men they desire, but this generosity comes with strings attached—equal reciprocation is expected.

If they do not receive the positive attention and affection they hope for, their gentle façade fades away, replaced by a ruthless and merciless pursuit of what they believe they are owed.

However, not all women are even remotely generous.

No, there exists a particularly vicious subset who are outright violent and criminal, disregarding any semblance of common decency.

These women think with their lower bodies, treating men purely as toys to be used and discarded.

They take perverse pleasure in breaking their male victims, reducing them to mere shells of their former selves.

Ironically, even in a society dominated by women, these abusive individuals are viewed as the lowest of the low, shunned and treated as criminals by the various guilds and factions that value stability and control above all else.

Make no mistake, these guilds do not sympathize with the plight of men out of compassion, but rather out of a need for control.

They despise anything that falls outside their grasp, and a society spiraling into chaos due to unchecked female violence is a threat to their power.

Most men in this world dream of changing their fate, of escaping the clutches of the oppressive, matriarchal structure.

They yearn to take control of their own destinies, refusing to be treated like disposable toys or forced to submit their lives to the whims of powerful women.

The answer to their prayers lies in the fabled Tower of Paradise—a place where they can seize their own future.

It is said that those who manage to pass the tower's trials will be granted extraordinary powers, abilities beyond imagination.

For many men, this tower is their only hope. They crave its promise, they hunger for its rewards, and they are willing to risk everything to claim a power that might finally allow them to defy the cruel hand they've been dealt in this world.

The Tower of Paradise emerged 15 years ago and completely reshaped society, from its very core to its outermost fringes.

It didn't matter if you were destitute or a millionaire; as long as you dared to climb the tower, you held the power to alter your fate.

The tower presented itself as an equalizer, a divine monument where dreams and ambitions were forged anew.

Each floor of the tower poses a unique challenge, perfectly balanced with the potential rewards.

The more exemplary your performance within the dungeon floors, the greater your spoils. It's an unforgiving place where the strong are properly rewarded, and the weak are mercilessly discarded.

The trials within the tower are divided into ten distinct sections, each escalating in difficulty. In the first section, players face a test of intelligence, acting as a gatekeeper before they are deemed worthy of advancing to the second floor.

According to the latest reports and insider leaks on the news, the challenge for Japanese players on the first floor involves passing the entrance exam of Advanced Nurturing High School.

If they fail to receive an invitation from the prestigious institution, they are swiftly disqualified and ejected from the tower, their dreams crushed before they could even begin.

The playing field between men and women is leveled here; Advanced Nurturing High School cares only about raw talent and potential, not your gender or social standing.

To pass the fundamental quest on the first floor, players must survive their first year in the school without getting expelled or failing miserably.

However, as for the final quest of this section, no one knows what it requires—it's shrouded in mystery and speculation.

Interestingly, the trials on the first floor are not fixed; they can change depending on the tower's whims.

Previously, the trial was set in the Steins;Gate world. If a player achieves a perfect score in their quests, the fictional world they conquer can merge with our reality. This is no mere illusion; it's a complete assimilation.

Kaguya successfully completed this quest, and now, I can see Makise Kurisu, once a character confined to tower, working as a top-tier scientist for the Shinomiya Corporation, right here in our world.

The same applies to the Classroom of the Elite world. If I manage to fulfill all the required quests and attain the highest marks, then that world, too, will merge seamlessly with our reality.

Of course, this merging applies only to the key characters from the trial; not everyone will cross over.

Their families, casual acquaintances, and the majority of the native inhabitants remain in their original world.

Only those deemed essential—key characters—are granted the privilege of merging into this reality.

Despite the tower's public accessibility, it harbors dark secrets and hidden machinations.

The true powers behind the tower's challenges are the guilds, operating in the shadows. They manipulate the trials and control the access quotas.

Each round of trials allows only 50 qualified participants to ascend, leaving countless hopefuls in the dust, oblivious to the existence of awakenings—a secret power boost achieved through the use of crystal stones.

Without knowledge of these enhancements, the uninitiated are inevitably left far behind, struggling to keep up with those blessed by this advantage.

My sister, Ai Hayasaka, had explained all of this to me in great detail. She told me about the crystal stones—artifacts capable of awakening the dormant potential within a human being.

The power they grant can be a game-changer, or it can be insignificant, entirely dependent on the individual's innate talent.

Even if the awakening is minor, it is better than nothing at all.

Most participants without connections or background don't even qualify to receive a single crystal stone; they're cast aside as fodder for the real contenders.

"I take it you're asking all of this because you want to climb the tower yourself, brother?" Ai Hayasaka asked, her voice tinged with a hint of concern.

"I do." I nodded resolutely, the determination in my voice unmistakable.

The idea of exploring new worlds, growing stronger, and indulging in every sensual pleasure imaginable—all while conquering and banging every waifu I encounter on my ascent—was intoxicating.

Unaware of my true intentions, Ai Hayasaka gave me a reassuring pat on the shoulder. "I'll do my best to find a crystal stone for you, then. It's not easy, but I'll make it happen."

"There's no need for that, sister," I shook my head, a smirk tugging at my lips. "Kaguya-chan has already promised to secure one for me. I know how rare and expensive they are, and I don't want you to go through the trouble when I have someone else already handling it."

Her expression darkened instantly, a storm cloud of jealousy brewing in her eyes.

I knew that look all too well.

Ai was jealous again, her possessive streak flaring up.

I sighed internally, choosing to ignore it for now as I redirected my attention back to the television. I absorbed every bit of information from the news, drinking in knowledge about the latest tower events and updates, blissfully unaware of the sound of the door locking behind me.

It wasn't until the subtle click of the lock echoed through the room that I realized something was wrong.

...

I will set these rules regarding the update stability of this fic. Here we go:

2 chapter per day = 80 power stones per day

1 chapter per day = 60 power stones per day

3 chapter per week = 30 power stones per day