Today was my first PE class since enrolling.

The gym uniforms they handed out were the same ordinary ones I recognized from my previous world.

On top was a white short-sleeved shirt, and on the bottom, shorts. For this grade, the designated color seemed to be a deep reddish hue somewhere between red and brown, and even the tracksuits were the same color.

After the previous class ended, I spoke up to Aoi, who sat next to me.

“Hey, where’s the changing room?”

Honestly, I didn’t think such a thing even existed.

After all, this school doesn’t even have a boys’ restroom.

Still, Aoi would know more about how things worked here than I did.

“Huh? What are you talking about? Of course we change in the classroom.”

“Huh…?”

A dumbfounded sound slipped out of my mouth.

If anything, I was the one who wanted to ask, What are you even talking about?

“Wait, wait, there are girls here too, you know? There’s no way we’d change together.”

“Kazuto-kun, stop joking around. Boys and girls have always changed together in classrooms at every school.”

At those words, I slowly swept my gaze across the entire classroom.

“H-Huh…!?”

The very next instant.

The girls throughout the classroom began taking off their uniforms as if it were the most natural thing in the world.

Before I knew what was happening, they had stripped down to their underwear and were already slipping into their gym clothes with completely nonchalant looks on their faces.

Even Asuka, standing right there in front of me, was no exception.

Despite me being a guy, she showed off her cute, snow-white underwear without a hint of hesitation.

“…Wa—”

My sense of reality vanished.. 

It was a sight no boy from my original world should ever have seen—Asuka in her underwear.

I could feel my face heating up, and I knew even my ears were turning bright red.

It wasn’t just Asuka—every single girl in the classroom was changing.

And so, without thinking, I blurted out—

“H-Hey, what do you think you’re doing, changing right here!? There’s a guy right here, you know!!”

I ended up raising my voice without thinking, even though Aoi had told me not to draw attention.

I mean, isn’t it obvious!?

I thought that girls in their underwear were something you only ever saw through a smartphone screen.

To see it in real life—a live changing right in the middle of the classroom, and being able to watch it all so openly without a single consequence… Nobody would ever dream of such a thing!

And then, one of the girls—still stripped down to her underwear—came stomping right over to me.

“I can’t take it anymore!!”

It was Shiramine Sanzu, the blonde twin-tailed girl who’d boldly declared she was joining the soccer club.

Her expression was unmistakably tinged with anger.

“I was planning to ignore you, but you’re seriously so loud! Do you want to get beaten up!? You should be grateful we’re even letting you stay in this classroom!”

“W-What about you!? Wearing those sexy light-blue panties and everything! You need to realize how cute you are! I’m a man, you know!? At least act worried about sexual harassment or voyeurism!!”

Shiramine was probably angry because, in this world, her way of thinking was considered perfectly normal.

But after being shown something so far beyond the bounds of common sense, there was no way I could just stay silent.

On top of that, Shiramine had such pretty features, and while she looked like a loli, she was genuinely cute

Her chest might have been on the modest side, but when you added the contrast of those frilly light-blue panties against her pale skin… No matter how you looked at it, it was undeniably sexy!

‘Hah?! Sexy!? I don’t even know what you’re talking about! O-Of course I’m cute, that’s just a fact! And this is just normal underwear! Even if you took a photo secretly, what would you even do with it anyway!?'”

“Th-that’s… if it’s a guy, there’s obviously only one thing he’d do! Don’t make me say it!”

“How should I know?! I couldn’t care less about guys or whatever they’re into!”

“You… If I let this slide…” 

“Y-You… if you keep talking like that… aaaargh, damn it! You bunch of perverts!!!!!”

Even while Shiramine and I were in the middle of our shouting match, the other girls just continued changing their clothes.

The classroom was filled with nothing but girls in their underwear—a sight that should have been absolutely impossible in reality.

I finally couldn’t take it anymore, and ran out of the classroom clutching my gym uniform and tracksuit.

◇◇◇

“Eh, Kazuto-kun!?”

“…”

Aoi stood frozen on the spot, his mouth wide open.

Beside him, Sanzu glared at Aoi with a cold, piercing gaze.

H-Hiiiee…! Kazuto-kuuun! Wait for meee!!!”

Though she didn’t say a word, the look in her eyes carried an intense pressure that clearly said: Go do something about this right now.

Overwhelmed by that stare, Aoi grabbed his gym clothes and chased after Kazuto out of the classroom.

“G-geez… What is wrong with that guy…?”

Still unable to hide her confusion, Sanzu stepped closer to Asuka, who was nearby, and asked quietly,

“Hey. You know that boy… right? He called you by name on the day of the entrance ceremony.”

“I think we went to the same middle school… maybe. But I barely remember him being there. And I’ve never called him by his name either…”

“…I see. Then it’d be pointless to say anything to you. Sorry about that.”

If they had been acquaintances, Sanzu might have tried resolving things. 

Sanzu had been thinking that if they were acquaintances, she could make her deal with it somehow, but if their relationship was so faint that it didn’t even remain in her memory, then there was nothing to be done.

“Also… I wanted to ask… Do my underwear look… sexy…?”

“Eh… Well, it’s cute but…” 

“Um… I mean, I think they’re cute, but… well, depending on how you look at them, they might be a little sexy… maybe?”

“O-oh… I see…”

At those words, Sanzu’s cheeks flushed slightly. 

She must have felt embarrassed herself.

“—Amazing… Just as I thought, he really is different from ordinary boys. To confront girls head-on like that… it’s unbelievable…!”

The girls around them all turned curious looks toward Kazuto.

But among them, only one—Kokonoe Touka—seemed genuinely moved by Kazuto’s actions, her heart stirred with admiration.

◇◇◇

“K-Kazuto-kuuun!!”

A loud bang echoed as someone knocked forcefully from outside.

“Yeah, yeah.”

“H-Hey, Kazuto-kun! What on earth happened to you!?”

Hearing his flustered voice, I opened the door to the multipurpose restroom and let Aoi inside.

It was the only place I could think of to change. Or rather, it was the only option.

“I mean… Aoi. Do you really feel nothing when you see a girl in her underwear…?”

“Umm… well, it’s not that I don’t feel anything… but it’s just a normal thing. If we worried about every little thing, we’d never get changed.”

Watching Aoi brush it off so nonchalantly, I found myself at a loss for words.

But as we kept talking, a single doubt rose up in my chest.

“Don’t tell me… even places like hot springs or public baths have shared changing areas, too…?”

“Hot springs? Oh, those are basically off-limits to men.”

“What!? Do you have any idea how much I love hot springs!? I mean, I’ve only ever gone with my family, sure! But I’ve gone to public baths with friends before too! Not that they even exist anymore now…”

“Half of what you’re saying makes no sense to me, but… entertainment for inferior species is pretty limited.”

Damn it!

What do you mean off-limits to men?

If changing in the classroom is considered normal, then public baths and hot springs should be the same too!

Changing in front of me in their underwear is OK, but the baths are NG…? What kind of logic is that?

“Haa…. Aoi, do you have time after school? Stop by my place for a bit.”

“Huh? M-Me… to your house? I-Is… that really okay? Won’t your family get mad?”

“Yeah, it’s fine. I’ll handle them if they have a problem. So come with me.”

“Awawawa… I-I’m so happy…! I finally get to go to a friend’s house…!”

The conversation had taken an unexpected turn, but Aoi seemed genuinely delighted by it.

As for me, this would be the first time I’d invited someone over since getting lost in this world. I couldn’t help wondering what my mom would think.

“—Huh?”

“Mm? What’s wrong?”

Just when I thought the conversation was over, Aoi froze, staring at my body.

I was currently in the middle of changing into my gym clothes, wearing nothing but a pair of underwear.

“Eh… Do muscles really form like that?”

“Um… is that really how muscles are supposed to look?”

“I guess so. I mean, my lower body aside, I hardly train my upper body at all. These abs just sort of showed up on their own from playing soccer.”

“Wait, you played soccer!?”

“Yeah. Nothing impressive, though.”

Aoi seemed surprised every time he spoke.

As far as I was concerned, I hadn’t done anything special, but to him, it must’ve looked like one unusual thing after another.

“Wow… can I touch them a little?”

“No thanks. I’ll pass on being touched by a guy.”

After politely refusing, I glanced at Aoi’s bare upper body. 

His white skin was so fair it seemed impossible for a guy, and even his nipples were a beautiful pink.

Honestly, if he told me he was a girl with a small chest, I felt like I might actually believe him.

◇◇◇

After changing into our gym uniforms and tracksuits, we headed to the field. 

And then I was surprised again.

I had caught a glimpse of it while they were changing in the classroom, but seeing it like this, right before my eyes… honestly, my heart skipped a beat.

What I saw there were bloomers, something that was supposed to have vanished from modern Japan ages ago.

While the boys wore shorts, the girls wore bloomers as if it were the most natural thing in the world.

Their beautiful thighs, illuminated by the sun, were almost blindingly bright.

While a few students had tracksuits over their uniforms, the vast majority were just in short sleeves and bloomers.

Here and there, I could see girls slipping their fingers under the tight fabric to snap them back into place.

……A live ‘Snap’.

Could this be another result of society becoming yuri-centered?

“Hey, Aoi. Are bloomers really considered normal?”

“Hm? I think so. Was it different at your school, Kazuto-kun?”

“Ah… that explains it.”

It seemed that in this world, bloomers were considered the proper, standard gym uniform.

And so today’s PE class was focused on track and field measurements.

Track and field, huh…

Honestly, I can manage ball sports decently enough, but I don’t remember ever being good at track events.

Just running would be one thing, but the wide range of events makes it a hassle.

“Today we’ll be doing the hundred-meter dash and the long jump! We’ll cover different events next week!”

The one announcing it was a young PE teacher with her hair in a ponytail.

She held a stopwatch and a record sheet, giving off a very athletic vibe.

Beside her stood another woman who looked like a college student, probably a student teacher.

“We’re short on time, so let’s move right along! Split into two groups and line up however you like!”

It’s more laid-back than I expected.

For now, it was just two events today. I decided to play it safe and start with the hundred-meter dash.

“You’ll be last.”

“…Yeah, yeah.”

Just as I was about to line up, the girls in my class shoved me toward the back.

A little annoyed by this natural discrimination… but since they just showed me  was slightly annoyed by the blatant discrimination… but since they showed me their underwear today, I decided to put up with it.

“Was her underwear pink…? Using my ‘see-through technique’ to picture them, I watched her walk away with a lecherous gaze.”

“Kazuto-kun, you’re not allowed at the front. You have to line up last. after everyone else.”

“…What an annoying rule.”

With no choice, I ended up lining up at the very back together with Aoi.

Huh? I’m only realizing this now, but… could it be that we’re seated at the very back of the classroom because we’re boys too?

No way… seriously? I thought it was the rom-com protagonist seat…

One after another, the girls started running.

From what I could see, none of them were particularly fast.

Their physical strength didn’t seem all that different from the world I came from, either.

And then, finally, it was our turn.

After Aoi ran first with a wobbly, unsteady form, it was my turn to run.