The Day the Sunset Fell Upside Down ~Everyone's Gender-Swapped~
Sendou Yuuhi is a high school VTuber with long brown hair, yellow highlights, and sunset-gradient eyes. She's a member of the virtual talent group 'Vuisupo!' and spends her days streaming with her friends. She thinks she's laid-back and gentle, but everyone tells her she's actually loud and energetic. One day, after a stream, Yuuhi finds an old mirror in the break room with a note reading 'Gender Reversal.' Thinking it's a joke, she shouts at the mirror, 'I'm tired of being a girl all the time—I
The Day the Sunset Fell Upside Down ~Everyone's Gender-Swapped~ - A best friend who became like an older brother
Monday morning. The sky over Shibuya was heavily overcast.
Sendou Yuuhi passed through the gates of Neo-Shibuya Academy. A fifteen-minute walk from Shibuya Station. A private high school with a strong reputation in IT and streaming. The uniform was a navy blazer with a red ribbon. But what Yuuhi was wearing now was men's slacks.
"Haah… I still can't get used to this."
A low voice came from their own mouth. Even after three days, this sense of wrongness refused to fade.
That Friday night, in the waiting room of the streaming studio "Mirror Ball," they'd found an old mirror. The paper stuck to it read "Gender Reversal." A wish shouted on a whim—who would've thought it would actually come true?
And the curse hadn't hit Yuuhi alone. Every member of Vuispo! had been gender-swapped.
(It's my fault…)
Yuuhi bit their lip.
(If I hadn't said that, none of them would've been dragged into this.)
That was exactly why Yuuhi believed finding a way to undo it was their responsibility.
"Yuuhi!"
A voice from behind. Low, but familiar.
Yuuhi turned around, and there stood—
Platinum blonde short hair. One side braided and pinned with a silver hairclip. Navy blue eyes like the night sky. But their height had grown. They used to be 162 centimeters; now they were nearly 175. Their shoulders had broadened too, and the men's blazer of the uniform fit them perfectly.
"Neon… right?"
"Obviously. Who else would it be?"
Hoshimiya Neon. A member of Vuispo! and the president of Neo-Shibuya Academy's Streaming Club. Yuuhi's best friend. They self-identified as cool and tsundere, but in truth they were caring and dependable.
The current Neon had a boy's body.
"Whoa, Neon, you got taller! That's more than ten centimeters!"
"You're too loud! It's morning, keep it down!"
Neon pressed their hands to their ears. Those ears were faintly red.
"Ehehe. But I was just so surprised."
"I'm the one who's surprised. You actually went with the boys' uniform."
"Yeah. A skirt just… felt off, somehow."
"Well, I get that."
Neon was wearing men's slacks too.
The two walked side by side toward the Streaming Club room.
Down the hallway. Students they passed kept glancing their way.
"Hey, isn't that Hoshimiya-senpai?"
"Wait, no way. Didn't they get way cooler?"
"Sendou-senpai too—still cute even as a boy…"
Whispers drifted past.
(Yeah, we do stand out…)
Yuuhi shrugged their shoulders just a little.
"Don't mind them. You'll get used to it in three days anyway."
"Are you okay with all this, Neon?"
"Of course I'm not. But reacting to every little thing just wears you out."
"I see. You're strong, Neon."
"Not really. You're just too weak."
"Ehh, that's harsh."
But Neon's lips had curved, just slightly.
They reached the club room.
The Streaming Club room was at the end of the third floor. Inside, streaming equipment filled the space—the Vuispo! members often prepared their broadcasts here.
The door slid open with a rattle.
"Nobody's here."
"It's morning. Of course not."
Neon sat down in the chair by the window.
"Yuuhi."
"Hm?"
"…Are you okay?"
The low voice echoed quietly.
"With what?"
"Your body, your mood. Becoming a boy—has anything felt strange?"
Neon stared steadily at Yuuhi. Those navy eyes were serious.
(Ah… Neon's worried about me.)
Yuuhi felt a warmth spread through their chest.
"I'm fine. My voice got lower, my chest went flat, and… I guess I woke up thirsty this morning."
"That happens to you every day."
"Oh, maybe you're right."
The two shared a small laugh.
"But I really am fine. What about you, Neon? Isn't it tough having a bigger body?"
"I'm fine. If anything, this build is convenient."
Neon crossed their arms.
"Convenient how?"
"Because, well… it means I can protect you."
"Huh?"
"Did you not hear me? Did your ears get worse too?"
"I heard you, but… protect me?"
"Exactly what it sounds like. Right now I'm taller than you, and stronger. So if anything happens, I'll protect you."
Neon's face was red all the way to the tips of their ears.
"Neon…"
"Don't get the wrong idea. It's not for your sake. If you collapse, it'll delay breaking the curse. You're a nuisance, so I'm just protecting you."
"…Neon, that's what they call tsundere, right?"
"I am not tsundere!"
"Ehehe. But thank you. I'm really happy."
When Yuuhi smiled, Neon's face went even redder, and they turned away.
"I told you, it's not like that…"
That voice was much quieter than before.
After school.
The two decided to split up to gather information about the curse.
"I'll check the library for anything on Gender Reversal."
"I'll dig through old stream recordings in the club room. Maybe something about that mirror got caught on camera."
"Got it. I'll message you if I find anything."
"Right. You've let your phone die before, so be careful."
"Ugh… that was only once."
"Once is more than enough."
"Okaaay."
Yuuhi gave a small bow and headed for the library.
The library was on the second floor. Quiet, with the smell of books.
Yuuhi searched "Gender Reversal" on the terminal.
(Is there anything…?)
A few results appeared on the screen.
But all of them said only "a type of magical phenomenon," "details unknown," "a handful of past cases reported."
"Hmm, this doesn't tell me anything."
They muttered under their breath.
(Convey your true feelings to someone… huh.)
That was the key to breaking the curse—Yuuhi knew that much.
But to whom, what, and how?
(Have I ever told anyone my true feelings?)
Yuuhi tilted their head.
(I say "I like you" to everyone all the time, but…)
What did "true feelings" even mean?
No matter how long they thought, no answer came.
Ping.
Their phone buzzed. A message from Neon.
'If you're free, come help. Too many documents in the club room for one person.'
"…'If you're free,' huh."
Yuuhi couldn't help but laugh.
'On my way!'
They replied and left the library.
Back in the club room, Neon was sitting on the floor, wrestling with a mountain of old files.
"Welcome back. Find anything?"
"No. The books only said it was a magical phenomenon."
"Figures. Nothing on the recordings here either."
Neon closed a file.
"I see… But I'm not giving up yet. Tomorrow, let's try searching online."
"Right. And let's ask Ruri too. That kid might know something surprisingly useful."
"Ruri-chan, huh. Come to think of it, Ruri-chan was originally a boy."
"Yeah. So they're the only one who understands what a boy's body feels like."
"I see. I'll talk to them sometime."
"You do that."
That was when it happened.
Neon suddenly stood up.
"…Bathroom. Be right back."
"Oh, okay. See you."
Neon left the club room.
Five minutes later.
Yuuhi found Neon in the hallway.
Standing squarely in front of the girls' restroom.
"Neon? What's wrong?"
"…What do I do?"
"What is it?"
"I don't know if I should use the boys' room or the girls' room."
Neon said it with a completely serious face.
"Your body's a boy's, but your heart's still a girl's, after all."
"Of course. Even in this body, my heart is still me."
"Yeah. Neon is Neon."
Yuuhi smiled brightly.
"…Which one are you going to use?"
"I… hmm. I'm torn too."
"You too, huh."
"I mean, my body's a boy, but my heart's a girl."
The two looked at each other.
"…Wait for a moment when nobody's around?"
"Let's do that."
The two held their breath in front of the girls' restroom.
Waiting for someone to come out.
Eventually, it was empty.
"Now."
"Yeah!"
The two dashed quickly into the girls' restroom.
Inside, it was quiet.
Their reflections stared back from the mirror above the sink.
"…Who is that."
"…I was thinking the same thing."
In the mirror stood a boy with brown hair and yellow streaks, and a boy with platinum blonde hair.
"Ahaha. It's kind of funny, isn't it?"
"It's not funny. But…"
Neon gazed at their reflection.
"…Well, it's not bad."
"You look cool, Neon."
"Wha—what are you saying?!"
"Huh? I was complimenting you."
"You say stuff like that without thinking—that's what makes you so hard to deal with."
"You think so?"
"I do. …Come on, let's hurry up and finish."
"Okaaay."
The two went into separate stalls.
A while later, they came back out.
Washing their hands, Yuuhi looked at the mirror.
(Boy me…)
Still not used to it.
But just having Neon beside them made things a little less scary.
When they returned to the club room, their phone was vibrating.
"Oh, it's from Ruri-chan."
They opened the screen.
'Yuuhi-san, are you okay? Ever since I became a girl, there's so much I don't understand… If it's not too much trouble, I'd like you to tell me what a boy's body feels like.'
"Ruri-chan seems troubled."
"They were originally a boy, so they must be even more confused."
"Yeah. …Maybe I'll call them."
Yuuhi dialed Ruri's number.
After a few rings, it connected.
'Hello, Yuuhi-san?'
A soft voice. But a little anxious.
"Ruri-chan, are you okay? I read your message."
'Ah, yes. Thank you. Um, I became a girl's body, and there's so much I don't understand…'
"Yeah, yeah. I'm the same—became a boy's body and there's nothing but things I don't get."
'You too, Yuuhi-san?'
"That's right. I woke up and my voice was low and it shocked me, and my clothes don't fit."
'I understand… I don't know anything about skirt lengths or how to style my hair either.'
"Ahaha. It must be tough for you, Ruri-chan, becoming a girl."
'Yes. But I think I'm the only one who understands what a boy's body feels like. If there's anything I can do to help, please tell me.'
"You're always so kind, Ruri-chan."
'I-is that so? I just want to be useful to someone, that's all.'
Ruri's voice sounded embarrassed.
"No, really, thank you. I've got tons of things I want to ask you about having a girl's body, too."
'Yes, ask me anything. …Ah, but I'm also full of things I don't understand, so I'm not sure I can answer.'
"That's fine. Let's figure it out together."
'…Yes!'
Ruri's voice brightened a little.
The call ended.
"Ruri-chan's a good kid."
"Yeah. Their kindness has helped me too."
"Mm. If we all work together, I'm sure we can break the curse."
"Right. …You say good things once in a while."
"Ehehe. Being praised by you makes me happy, Neon."
"I wasn't praising you."
"Ehh, that was definitely praise just now."
"You're imagining things."
"Muu."
When Yuuhi puffed out their cheeks, Neon let out a small laugh.
"…Let's go home. We didn't find anything today, but we can search again tomorrow."
"Yeah. You're right."
The two left the club room.
The school at dusk was quiet.
They changed their shoes and headed for the gate.
Through gaps in the clouds, orange light spilled from the sky.
"Neon, the sky's beautiful."
"…Yeah."
Neon looked up at the sky.
That profile was a boy's, and yet somehow still a girl's.
(Neon is Neon.)
That's what Yuuhi thought.
Even if the body changes, the heart doesn't.
That was, just a little, a comfort.
Just outside the gate, Yuuhi's phone buzzed.
"Huh? It's from Satsuki-san."
They opened the screen.
'I have something to tell you about the Reflect Mirror. Come to the waiting room in the old school building of Neo-Shibuya Academy tomorrow. You don't have to come alone.'
"Satsuki-san says to come to the old school building's waiting room."
"The old building? Isn't that off-limits?"
"Yeah. But if Satsuki-san says so, there might be something there."
"…What is that investigator, anyway? They've been hiding something for a long time."
Neon furrowed their brow.
"But let's hear them out. I think Satsuki-san is worried about me."
"…You're right. They're harsh, but they look after people."
"Yeah. Let's go together tomorrow."
"Of course. Like I'd let you go alone."
"Neon…"
"Don't get the wrong idea. You're a nuisance, so I'm just tagging along."
"Yeah. Thank you."
Yuuhi looked at Neon's face and smiled brightly.
The sunset stretched their two shadows long across the ground.
(What will we find out tomorrow?)
Deep in Yuuhi's chest, a small hope and an equal measur
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