Chastity Reversed: Part-Time Life by the All-Girls High School

Suddenly, the sights of my old world opened before me.

Spring, mid-April, freshman year of high school.

Spring had come and was quickly beginning to fade.

It was about the time when I’d just joined a club and started getting to know my classmates better.

Well—only the boys, though.

“So, what about Sora-kun?”

“Hmm… not quite my type. Sora-kun doesn’t seem very ‘manly’, you know?”

It was after school that I heard this, when I’d gone back to the classroom to grab the juice I’d forgotten.

I overheard a group of girls in my class chatting about romance.

Purely by chance, I heard it.

“I mean, he’s got a lean, fit body and a clean look—he’s definitely above average.”

“They call it a ‘salt face’, right? That kind of look.” (T/N: A salt-type face (塩顔, shio-gao) refers to a facial type in Japanese slang characterized by subtle and delicate features. Men with this look often have sharp facial lines, thin eyes, and a calm, minimalist expression that exudes a refreshing and understated charm. This appearance contrasts with more robust or bold types like the “sauce face’, emphasizing quiet sophistication over intensity.)

“Yeah, yeah. Light, simple features with no strong quirks!”

“And yet… something about him feels off. You get it?”

“Totally. He looks like the type who would hit a girl!”

“Haha, exactly!”

I wasn’t particularly good at talking to girls.

So, I hadn’t really spoken much to any of the girls in my class.

But—it felt like they were talking about me as if they knew me inside and out.

“He doesn’t seem like the kind of guy who’d treat his girlfriend well.”

“He’d never make anyone happy!”

“Ugh, so true. Alright, next! How about Marunouchi-kun?”

And just like that, they shifted to a new topic as if nothing had happened.

I knew it was unfair of me to feel like this.

After all, we’d only been in the same class for a few weeks.

But it still hurt.

I felt like I couldn’t breathe.

“Not manly, huh…”

I muttered to myself as the scenery around me blurred, skipping ahead to the next day.

In the end, I couldn’t bring myself to enter the classroom after overhearing that.

The next day, I quietly retrieved the juice I’d left behind, pouring its undrinkable contents into the school’s drain.

And while doing so, I found myself wondering—was this what made me so timid?

“Hey, Sora, what are you throwing away? What a waste.”

“I forgot this in the classroom yesterday and left it overnight.”

“What a klutz.”

One of my guy friends walked up and started chatting. I offered him a lame excuse while still struggling to breathe. It was really weighing on me.

What would a “manly” guy have said in my place?

Would he admit, “I overheard those girls talking about me yesterday”?

I didn’t know. I had no idea.

But my chest was tight.

I could’ve sworn I had decent lung capacity back then, but apparently not.

“Hey, would you say I’m a nice guy?”

“Sora? You’re too nice, honestly.”

“…Really?”

“To both guys and girls, especially girls.”

“Is that so…”

“Which is kind of why you’re not popular.”

“You wanna get punched?”

“Actually, you seem like the type who’d get abused instead.”

“Hey, shut up!”

We laughed as we went back and forth.

Honestly, I did want to be popular. If possible, I wanted a girlfriend.

But times like this—hanging out with friends—might’ve been more important to me.

“So, Sora, why are you struggling to breathe so much?”

“Huh? Oh… that’s right. This is all just a dream.”

“A dream?”

“Yeah. I’m in this completely reversed world right now.”

“What the heck is that?”

That was when I finally realized—I was dreaming.

I probably saw something weird because I was so tired from the pool earlier.

Once I became aware of it, this scene filled me with longing.

…Maybe I’d stay here a little longer.

Even if it was just a dream, it was still a chance to relive my old world.

“Wouldn’t it be better to snap out of it quickly, though?”

“Huh?”

“Hasn’t your ‘little sister’ been acting strange lately?”

“My sister? How do you know—”

“And wasn’t your shirt unbuttoned when you woke up the other day?”

“…What?”

“You noticed, didn’t you?”

“What are you talking about?”

The face of the friend in front of me blurred, becoming hazy.

But his gaze remained steady, staring straight at me.

Once again, I couldn’t breathe.

“You’re too nice. Even to yourself.”

“…”

“Because you didn’t want to lose your safe space, you ignored your instincts. Isn’t that right?”

“I…”

“And now you’re in this situation. That’s just who Sora Sato is—a naïve little slut.”

“…Wait, who are you?”

“If there’s even a shred of doubt in your mind, then—”

The dreamscape shifted. The memory crumbled.

What stood before me was no longer my friend.

It was me.

“Just wake up. Aren’t you suffocating in more ways than one?”

The sound of his voice jolted me awake.

I opened my eyes to find—

☆

“…Sora-nii…!”

Right in front of me was Akari, half-undressed.

Naturally, my own clothes had been removed as well.

And we were—

Connected.

This…

Even in this world, this was a taboo.

“Can you get off me?”

I spoke, putting a stop to it immediately.

My lower half was burning hot, yet my head was as cold and clear as ice.

“Oh… okay…”

“Just get dressed.”

“Y-yeah…”

There was no evidence of protection being used.

This was one of the few times I was grateful for being a “slut”.

If this had been my “first time”, if I hadn’t had those experiences yesterday—

I might’ve lost control entirely.

In Akari’s rush to lose her innocence, she had become—someone very much like me.

“Akari.”

“…Yes?”

My voice was colder than I expected.

I wanted to punch my former self for being so soft.

I got dressed, wiping away the remnants of her kiss from my mouth.

Oh, right—so this was my “first” kiss. Not that it mattered.

Once I was done, I turned to face her calmly.

“Promise me. Don’t tell anyone about this.”

“H-huh?”

“If you refuse, then I’ll cut ties with you.”

“!?”

“Do you understand?”

“Y-yes…”

Looking back, a part of me must’ve known this would happen.

But I was weak.

I didn’t want to lose the comfortable place I’d found.

So I pretended not to notice.

I convinced myself it wouldn’t come to this.

But I was wrong.

This world… it was different.

“I’m sorry, Akari. This isn’t your fault.”

“…”

“It’s all… it’s all my fault.”

If I couldn’t see her as a “sister”, then the reverse must also be true.

If she couldn’t see me as a “brother”, then this was bound to happen.

An older unrelated man and a girl sharing a room.

There was no way this could’ve ended any differently.

I should’ve asked to be separated much sooner.

“Stay here. Thanks for everything, Akari.”

“S-Sora-nii…”

“When you’re still a student, always use protection. That’s all. Goodbye.”

And then, I headed straight to this world’s “Father”.

In their bedroom, where he was alone since my “mother” was staying overnight at work.

After knocking, I entered the room.

“Whoa. What’s going on all of a sudden? Why the serious look?”

He looked at me with a puzzled expression.

Of course, he’d be confused.

But I couldn’t avoid this.

“Sorry. I… assaulted Akari.”

“What?! Wh-what are you saying?”

The disbelief on his face was palpable.

“Exactly what it sounds like. You’ve heard of incest, right? I couldn’t hold myself back. Before I knew it, I’d… done it. But I came to my senses halfway through. Still, if she’s pregnant, that would be a huge problem. She’ll need emergency contraception. I’ll need some money, and I’d like you to accompany her to the clinic. Is that okay?”

I spoke calmly, almost mechanically.

Even in this reversed world, women were the ones who could become pregnant.

Emergency contraception existed here, just like in my old world.

And just like there, it cost about 10,000 yen.

I’d looked it up online after becoming a “slut”.

Ironically, after buying that swimsuit, the condoms, and the lotion yesterday, my wallet was empty.

So, all I could do was ask my parents for money.

It was pathetic, but maybe it was for the best.

“…Alright. I understand. Tomorrow morning, I’ll send Akari to the obstetrician with her mom.”

“Thank you.”

“It’s late tonight… Sora, you and I will sit down and talk tomorrow. Is that okay?”

“Sounds fair.”