Today was the day of the physical exams.

It was an event that took up the entire morning.

There were seven first-year classes, from A through G, totaling roughly two hundred students.

Each class would go through the measurements in turn—a perfectly ordinary school event… or so it was supposed to be.

But at the time, I still didn’t know.

That what awaited me next would be a sight far more shocking than the incident during the PE uniform change.

And that no matter how much I tried to avert my eyes, there would be no escaping the pain that came with it.

◇◇◇

“Okay, everyone, quiet please!”

With a cheerful voice, Sakura Shio-sensei entered the classroom in her set-up attire. 

In her arms was a large cardboard box she was carrying together with the class rep. It seemed they were about to hand something out during morning homeroom.

“Please pass these back, one by one!”

Something was handed along each row.

The moment I took it from Asuka, who sat silently in front of me, I frowned.

“…What is this… paper?”

A thin, flimsy material that fluttered lightly.

As if she’d seen right through my confusion, Sakuraba-sensei smiled and began to explain.

“It’s almost the same as the one used in middle school. At this school, we use this as the physical exam uniform. Once homeroom is over, please change into it right away, okay?”

“Huh…?”

A dumbfounded sound slipped out of me.

Because the so-called physical exam uniform in my hands looked, no matter how I saw it, like nothing more than a sheet of light-blue paper.

It was about as long as the upper thigh, with strings attached on both sides, designed to be slipped over the head and worn around the neck.

But one touch was enough to tell—it was thin and flimsy, almost like paper.

When you hear “physical exam uniform,” you think of a hospital gown or gym clothes at school. That’s common sense.

That was how it had been in my previous world.

But what lay before me now was a flimsy scrap that defied all common sense.

With only a brief explanation, homeroom came to a quick end.

Just like during the PE class, the girls began to strip off their blazers to change.

But while still wearing their blouses, they reached inside their collars without a moment’s hesitation and began unhooking their bras.

The next instant, colorful bras—still soft and warm from their bodies—were being laid out on their own desks.

White, pink, navy… and then, there was Asuka’s.

Today, she had chosen a mature black.

The mature color created a strange, striking contrast with her usual prim and proper image.

“~~~~~!?”

A strange sound slipped from the back of my throat without thinking, and my face heated up instantly.

That said, the girls around me weren’t acting completely unfazed either.

Some of the girls had a faint blush on their cheeks, while others moved to discreetly shield their chests.

Apparently, they still felt a certain level of reluctance toward taking off their underwear.

Even among the same sex, it’s embarrassing to have your chest seen—in a Yuri-centered society, that feeling is perfectly understandable.

After all, the person looking at you might be a future lover.

…That being said, the current scene is seriously insane.

While in the middle of changing, they were braless beneath their shirts.

Perhaps because of the rising heat, only a few girls had the extra layer of a camisole, resulting in faint protrusions showing through the thin fabric.

“Awawawawa…!”

“Kazuto-kun, what’s wrong? Do you want to go to the multipurpose restroom like before?”

“Y-Yeah… I-I’ll go… b-but…”

No good. Both my mind and body had reached their limit.

My lower half wouldn’t obey me, and my rationality was screaming in protest.

I hunched over, clutching the paper physical exam uniform as I somehow managed to get away from there.

And together with Aoi, I ended up quietly changing in the multipurpose restroom.

“Ah… hahaha…”

And the moment I returned to the classroom, my self-control nearly snapped.

I knew it—I should’ve known.

But this was far beyond what I’d imagined.

It was true that in this world, they didn’t see men as the opposite sex.

Even so… this is way too much…

What greeted me in the classroom was an unbelievable sight.

Every single one of the girls was wearing the paper physical exam uniform—while still completely braless.

To make matters worse, the gowns only reached down to their thighs and were barely held together by strings on the sides.

In other words, their panties were almost completely exposed, both from the bottom and from the sides.

For the taller girls, they were in full view.

But what made it even harder to know where to look was… the side-boob.

While the exam gown covered their front and back, the sides were nothing but strings.

The shape of their breasts and the soft texture of their skin were almost completely exposed.

Because of that, the well-endowed girls had an even more overwhelming presence, while for the more modest girls, you could almost see their nipples through the gaps in the fabric.

“T-This is bad… My… my crotch is…”

“K-Kazuto-kun? Your face is bright red…”

“Aoi… are you… are you actually… impotent…?”

“What’s that? I don’t really get it, but look! Everyone’s already started lining up outside. It’ll be bad if we’re late since we’re boys?”

“Y-Yeah…”

I scrambled to my feet and hurried out into the hallway, using both hands to press down on my crotch.

Naturally, I ended up at the very back of the line. 

Before long, the teacher’s instruction rang out.

One by one, the students began moving toward the infirmary or the classrooms being used for the measurements.

I followed along with the crowd—all while feeling like I was on the verge of erupting.

◇◇◇ 

—The first measurements were height and weight.

But that was when something completely unexpected happened.

A truly major incident.

Standing directly in front of me was Asuka.

She was chatting cheerfully during the wait with Katayose Mayu, the girl from the seat next to hers.

“Asuka-chan, you’re actually pretty busty, aren’t you? Now that your bra is off, I can really see the shape~”

“Wa—Mayu-chan! You shouldn’t be looking at someone like that unless they’re your lover!”

“But people see each other naked at public baths, right?”

“That’s not the same thing!”

…I saw it.

The pale skin of Asuka’s breast, seemingly close to spilling out from the side.

It was a reality I was experiencing for the first time.

They were so much more beautiful and so much better shaped than I had ever imagined.

If I were still in my old world, then maybe one day… The thought crossed my mind, and I shook my head violently.

No, stop. That kind of thinking is strictly forbidden right now.

“I’m telling you, you’re at least an E-cup! No, maybe an F? You’ve gotta be an F! I’ve only got a C~”

“Mayu-chan! Stop talking about that in front of the boys!”

…What? 

In front of the boys? 

Even when I was around before, she hadn’t cared about me at all.

Could it be that the way she sees me is starting to change, little by little…?

But this was no time to be thinking about that. Right now, I was in a seriously bad situation.

“Who cares about the boys? Look, I’m gonna grope them~!”

“Wa—Mayu-chan! Seriously, stop. We’ve only just become friends… I’m going to get really mad, okay?”

“Okay, okay, sorry… You look like you’d be scary when you’re angry, Asuka-chan, so I’ll stop there~”

“Jeez… knock it off with the jokes…”

Otomi glared at me while giving a quick glance in my direction. 

…So she is aware of me after all?

And then, the first weight measurement began.

“—46 kilograms.”

“…………”

I’d learned Asuka’s weight without meaning to.

In the 40-kilo range. Lighter than I’d expected.

And yet, those breasts… that really is Asuka for you.

Then it was my turn.

After the weigh-in came the height measurement.

Everywhere I looked, it was nothing but girls.

The nurse taking the measurements was a woman, the students were all women. Following Class A, the girls from Class B began lining up as well.

—But the line ahead seemed a bit backed up, so there were still a few people inside the room.

Asuka and Aoi were among them.

“Hey, you there. I need you to straighten your back properly, or this won’t work.”

The nurse’s voice sounded faintly irritated.

No, I can’t stand straight!

After all, right now I’m… rock hard.

If I straighten my back, it’s over.

I’m wearing underwear, but the exam gown is completely useless at my height—she’ll notice immediately.

“I’m about to get angry, you know? Honestly, this is why boys are—”

The tone in the nurse’s voice sharpened further.

And then, she stepped closer to me.

“Stand up straight—now!!”

“Waaah!?”

She shoved my shoulders, forcing my back straight.

Thunk—the measuring bar came down hard on my head.

“Alright, 173 centimeters. Pretty tall for a boy… huh? What’s this?”

“W-What? N-No, it’s nothing!”

The nurse’s gaze dropped to my lower half.

A moment later, Asuka, Aoi, and even the other girls in the room followed suit, all looking my way.

“Are you hiding something in there? Don’t tell me you’re trying to pad your height.”

“No, no, nothing that ridiculous…”

“Then take it out. Cheating won’t be tolerated!”

Saying so, the nurse crouched down. 

Her fingers hooked onto the waistband of my underwear.

“W-Wait, hold on a second! Nurse!?”

“What are you trying to guard?! You’re a boy—stop resisting!”

“I’m telling you, that’s not it!”

Just how much did girls in this world even know about male genitalia?

Probably not much.

There were no images online, and it wasn’t something that ever came up in class, either.

Aoi, standing right in front of me, was watching the situation in a fluster, clearly panicking.

He had the same “thing” himself. He surely understood just how humiliating it would be for it to be exposed like this.

But he seemed to be terrified of the girls, leaving him unable to put a stop to it.

“Hey, give me a hand! This boy might be hiding something dangerous!”

“Got it!”

Another nurse approached, and now hands were reaching for my underwear from both sides.

“Guh… Stop… It’ll tear…” 

“Give it up already!!”

“Gyaaaah!?”

My resistance was futile, and my underwear was dragged down past my knees—

—Pop.

In front of over a dozen people, everything was exposed.

“Eek!?”

“Eh, what… is that…?”

“It’s growing from the crotch…” 

“Is it a sausage?”

“But wait, isn’t it huge…?”

“It’s… kind of stiff…”

“It’s totally different from ours… weird…”

A murmur rose from the girls, their voices a mix of surprise, curiosity, and fear.

My face felt like it was going to explode from the sheer humiliation, and I just bolted forward.

—And then, at the absolute worst possible moment, I tripped.

“Kyaa!?” 

“Uwaa!?” 

I fell right onto Asuka.

Before I could stop myself, I ended up pushing her down.

—Squish.

A soft sensation mixed with a citrus-like sweet fragrance tickled my nose. 

…It’s over. 

“You…” 

Asuka’s face flushed bright red.

Slipped through the gap in her exam clothes, I was touching her bare breast directly.

“Never…” 

“N-Never?” 

“—I’ve never even let another girl touch me there before!!”

“Bugh—!?”

It was a fist.

Asuka’s right fist landed square on my cheek, and I was knocked down cleanly.

“It hurts… but… it was so soft…”

Even as my vision began to blur, such an inappropriate thought crossed my mind.

—Click.

The sound of a camera shutter.

We should have left our belongings back in the classroom, yet someone had just taken a photo. I had a sinking feeling that was the case, but I was in no condition to confirm it.

“Kazuto-kun!!” 

Aoi rushed over and helped me up, putting an arm around my shoulders.

But my consciousness continued to drift further and further away—