I Thought It Was a World Where Chastity Norms Were Reversed, But It Turns Out I Was Just Surrounded by the Overly Intense Girls in My Class - Chapter 15-16

Chapter 15: Creatures Known as Big Sisters

Humans are creatures that grow.

There are things you can’t do as a child that you gradually become able to do as you get older.

Changing clothes is one example.
Babies are basically dress-up dolls, but as they grow they slowly learn to dress themselves.

That’s how it works in a normal family. That’s common sense.

But my family is a little different.

Specifically, my big sister still tries to help me change.

“Why are you changing by yourself again?”

Right after breakfast.

She barged into my room without knocking while I was halfway through getting dressed.

The moment she saw me buttoning my shirt, she shot me a sullen, half-lidded glare.

“Why do I have to wait for you?”

“Because helping her little brother get dressed is a big sister’s job.”

“I’m in high school…”

No high school boy in the world still lets his sister dress him.

A creature like that shouldn’t even exist.

“But Tatsuya-kun, you’re still a minor, right?”

Yet this world has exactly that kind of sister.

This type of sister loves pulling out random, incomprehensible logic. Like this.

“If a minor is walking around late at night, the police pick him up, right? And when that happens, a guardian has to come get him, right?”

“Well, yeah…”

“So that means you need your big sister. Helping you change is totally normal.”

That’s the classic example of a sister who shouldn’t exist.

And the reason a dangerous person like her can walk around free is because this world is special.

A world where chastity norms are reversed.

A world where there are way more women than men, and the ratios are completely flipped.

Common sense doesn’t apply here.

I suggest playing shogi and immediately get attacked by girls in my class.
I try teaching another girl shogi and it turns into a battlefield.

And that’s not all.

The yankees are terrified of women, and somewhere a pair of siblings is always playing tag.

In short, common sense is meaningless, and having broken chastity norms is considered correct.

That’s why someone who’s basically a criminal-in-waiting like my sister can stroll around without a care.

“Even so, helping me change is a separate issue, isn’t it?”

“Now, now, don’t worry about the details.”

She completely ignored what I said, smiled brightly, and stepped closer.

Then she snatched the necktie from my hands.

“Stay still, okay!”

She lightly tapped both my shoulders.

Looks like today she’s tying my tie again. That’s the one thing she absolutely refuses to give up as a big sister.

“Don’t move!”

“It still feels weird…”

While she was tying it, my neck felt ticklish, so I turned my face away on reflex and immediately got scolded.

“I’ve been helping you change since you were little, remember?”

“Yeah, but…”

I reincarnated into this world only a month ago.

I have memories from before that, but they don’t feel real—like memories that exist but don’t.

“Look at me and don’t move.”

“Do I really have to look at your eyes?”

I muttered, and she gave me a big smile.

“Oh? Are you excited because my face is so close?”

“No way.”

“Tatsuya-kun is in puberty now, huh? Finally old enough to get excited over his big sister.”

“There is no such age.”

Even if puberty or a rebellious phase exists, there is no phase where you get excited over your sister.

“Ehhh, but my heart is racing right now.”

As she spoke she slowly brought her face closer. Her breath grazed my neck and gave me goosebumps for a second.

“I told you not to move, remember? If you break a promise with your big sister, you get punished.”

“Please just finish tying it. I’m gonna be late.”

“It’s fine. We still have about five minutes.”

She went to the same high school, so she knows exactly how long it takes to get there.

In other words, I can’t use “I’ll be late” as an excuse to escape, and I’m stuck letting her do whatever she wants.

“Done!”

She finished the knot and smiled, clearly in a great spirits. Then she suddenly pulled out her phone.

“Can I take a commemorative photo?”

“No.”

“Aw, I wanted one from the front too.”

Her cheeks puffed out sulkily.

She looked openly annoyed, but if I give in even a little, Mom will join in and it’ll turn into a full-blown photo shoot, so I have to stop that at all costs.

Yes—this is the terror of a world where chastity norms are reversed.

“By the way, Tatsuya-kun.”

“…Yeah?”

After finishing the tie, she casually picked up the pajamas I’d taken off, sniffed them, and asked in a perfectly normal tone asked,

“When am I getting my necktie back?”

—

Chapter 16: People Who Can’t Defy Their Yandere Little Sisters

What’s the point of a necktie, anyway?

I’ve wondered that before.

A scarf or neck warmer keeps you warm. An apron protects your clothes when you spill food.

But a necktie? It does nothing whether you wear it or not.

In fact, it can dip into your ramen broth, get caught on something, and it’s just plain uncomfortable around your throat.

So what’s the real reason people wear them?

Generally, it symbolizes reliability and gives a solid impression. A guy with a tie looks more serious than one without. Basically, it’s fashion.

“You can’t just leave it at school forever, right? Why hasn’t my necktie come back?”

“Well, that’s…”

And there’s one more important role.

Neckties are a classic gift.

They’re given on birthdays or anniversaries to show affection or love for your partner.

In other words, a necktie isn’t just something you wear; it’s proof of love.

Except in my sister’s case, it’s different.

“That tie is the one I wore for three whole years, you know? Losing it on the second day of school is just cruel.”

“It’s not lost, I promise. I can guarantee that much.”

“Then why hasn’t it come back?”

“Well, that’s…”

The reason she deliberately makes me wear her old necktie.

Apparently it’s to leave her mark on me. In other words, marking her territory.

By having me constantly wrapped in her scent and presence, she creates a barrier. It’s supposed to be the final line of defense when girls attack me.

Even saying it mildly, I don’t get it at all.

I don’t understand why she needs to mark me, and that “defense” didn’t work on Yukimi in the slightest, so I really don’t see the point…

“It’s not lost, right? Then bring it home today. If you did lose it… you know what’ll happen, don’t you?”

Either way, it’s a pain, so I want to get it back fast.

An angry big sister is a direct threat to my chastity just thinking about it.

“Got it. I’ll have it back by tonight.”

“Get it back? So someone stole it from you? Tatsuya-kun, explain in detail—”

“I’m gonna be late, bye!”

I shook off her attempt to stop me and sprinted out of the house.

※

No matter what, I have to get that necktie back from Yukimi today.

But to do that, I might have to play a game with her.

Actually, playing shogi would be great. More than welcome, even.

The world isn’t that kind.

I crossed the school gate with only five minutes left before homeroom.

“Crap, I’m cutting it close.”

I rushed to the shoe lockers and frantically changed into my indoor shoes.

That’s when I heard hurried footsteps behind me.

I turned around and saw—

“Bad bad bad I’m seriously gonna be late!”

It was Wakabayashi Yuuki from my class.

The same guy I saw yesterday evening happily playing tag with his little sister in the park.

Probably an advanced-level victim of daily confinement by said sister.

Panting hard, he came up beside me.

“Morning!”

He greeted me cheerfully.

“M-Morning… Wait, huh?”

Looking at him properly, it was easy to imagine he’d had a brutal morning.

Normally he looks like the wholesome soccer-club type, but right now his hair was a bird’s nest, his tie was crooked, and his shirt sleeve buttons were undone.

That wasn’t all.

Through the gaps in his sleeves I could see his arms were bright red with marks.

Dark circles under his eyes, constant yawning; clearly sleep-deprived.

“What? Something on my face?”

He asked while changing shoes, probably because I was staring.

“Sorry. You just look like you’ve been through a lot.”

“Ah, the bedhead? My little sister wouldn’t let go, so I didn’t have time to fix it. Barely made it on time.”

“That sounds rough.”

“You’re cutting it close too, Baba.”

“Me? Yeah, my big sister was being super clingy…”

No way was I going to admit she tied my tie for me, so I brushed it off.

Wakabayashi’s eyes lit up.

“No way! You too?”

“Me too what?”

“You’re suffering because of a sister too?”

“I do suffer because of my big sister… a whole damn lot.”

“Then we’re comrades! I never thought I’d find an ally this close!”

He happily slapped my shoulder.

It was our first real conversation, but he was just as bright and cheerful as I’d imagined; total jock energy.

Yet for some reason he didn’t feel like a stranger at all.

“For real? Your big sister is that bad too?”

“She’s the type of big sister who absolutely should not exist. But your little sister seems pretty next-level herself.”

We clicked instantly and chatted about our families while climbing the stairs.

Wakabayashi’s little sister, Suzu-chan, is apparently just as chastity-reversed as my big sister, if not more.

She’s obsessed with her big brother, and if he talks to another girl she “penalizes” him with confinement.

The confinement involves handcuffs and spending the entire night until morning with her; she even follows him to meals, the bath, and the toilet.

There’s no way to describe it other than complete chastity-norm reversal.

Or maybe the word “yandere” fits perfectly.

Either way, I could tell he goes through hell on a daily basis.

“Baba! I have a feeling we’re gonna get along great.”

“Yeah. Let’s be friends from now on.”

We reached the classroom and shook hands.

An unexpected friendship was born.

“Tatsuya-san?”

But life always balances luck with misfortune.

Someone was watching us smile and shake hands from the classroom doorway.

“What is the meaning of this?”

It was Yukimi.

She stood there with her usual refined beauty, but her expression was something else entirely.

Eyes wide, as if she’d witnessed something forbidden.

Then, looking somehow heartbroken, she murmured,

“So the rumor that you were playing a game with another man was true…”

“…Huh?”

“Holding hands with a man in the hallway in secret…”

“Yukimi-san?!”

I had no idea what was going through her head, but it definitely wasn’t anything good.

“No no no, that’s absolutely a misunderstanding—”

“There is no misunderstanding! There isn’t, Tatsuya-san!”

“Nothing happened, really nothing—”

I desperately tried to explain, but she clearly wasn’t listening.

“There isn’t anyyyyyyyyyyy!”

She screamed in excitement and ran back to her seat.

Her voice was so loud the entire class turned to stare daggers at me.

Wait, am I the bad guy here?

As I clutched my head internally,

“Hey, Baba.”

Wakabayashi, who’d been quiet, patted my shoulder.

“You’re pretty popular, huh?”

“No. That was definitely not it.”

Even as I said that, I peeked inside the classroom toward Yukimi.

Around her neck was a necktie.

Not a ribbon; a proper necktie.

I looked around; no other girl in the classroom was wearing one.

Why is Yukimi so stubbornly wearing a necktie?

I genuinely had no idea.