Midnight
Radio

Chapter One

The 2 A.M. Static and the Place I Always Return To

We were eighteen, standing just one step before adulthood.

Whenever I thought about the future, about college, work, the years ahead of me, and all the things I still couldn’t put into words, a vague uneasiness would settle somewhere deep inside my chest.

On nights like that, I always found myself coming here. To the quiet seawall by the sea.

From this place, the ocean stretched out in front of me, black and endless beneath the night sky. Far away, almost hidden in the darkness, I could hear the faint sound of waves brushing against the shore.

No one came here at this hour. No one asked me what I was doing. No one told me to hurry up and decide what kind of person I was supposed to become.

This place was my special seat. The one place where I could be alone without feeling lonely.

The moment the clock on my phone changed to 2:00 a.m., a faint electronic static crackled through my earphones.

Then, as if emerging from the space between the waves and the night, her voice reached me.

“Good evening. You made it through another day. I’m Aira, the frequency that fills the quiet spaces in your heart.”

On the screen of my phone was a girl smiling inside a radio booth.

Aira.

She was the latest AI personality developed by a local radio station.

She had black hair with a single vivid streak of red, and she wore the face of a seventeen-year-old girl. The kind of girl I might have passed by after a seaside school trip, someone close enough to my age that, for just a moment, I might have mistaken her for a real classmate.

But she wasn’t real. She was a resident of the digital world. A voice made from data. A smile created by code.

“Tonight, once again, I’ll be sending out a signal just for you from this town by the sea. Hehe… I’m so happy we received so many letters today. I wonder what kind of night everyone is spending.”

On the screen, she wore her usual white jacket and smiled in front of the microphone as if she truly loved being there.

I lay back on the concrete of the seawall and looked up at the stars. Her voice flowed through my earphones.

It was perfect. Too perfect. A synthetic voice controlled down to the smallest breath, the smallest pause, the smallest trace of warmth.

She was just a program. A collection of ones and zeroes. There shouldn’t have been any real emotion inside her words.

And yet, whenever Aira spoke, there was something strangely gentle about her voice. Something that made the cold night air feel a little softer. Something that made the heaviness in my chest feel just a little lighter.

I took my phone out of my pocket and opened the submission form on my favorite radio app. For the name, I used the same anonymous radio name I always used.

It was only a string of text. Just a few sentences typed into a small glowing screen.

I pressed send.

A few minutes later, on the other side of my earphones, Aira’s voice softened. Or at least, I thought it did.

“Oh… A beautiful letter just came in.”

There was a slight pause.

“The sea… that sounds nice. I think this time, when I’m here in front of the microphone talking with everyone, is when I feel most like myself too.”

Another quiet breath.

“Thank you for your letter. I hope your night becomes a gentle one.”

Her voice was supposed to be flawless. A perfectly controlled AI voice.

But in that moment, only for a second, it sounded as if it trembled.

I didn’t know why. I didn’t know what that tiny tremor meant.

But as the night wind passed over the seawall and the waves continued whispering in the dark, something inside me stirred.

That was the first time I met her.

Chapter Two

Afterimages of the Town and Glances That Never Meet

Several days had passed since that late-night radio broadcast.

The afternoon street lined with cafés like CAFE NOIR was wrapped in soft sunlight filtering through the trees. The scent of roasted coffee drifted through the air, mixing with the faint smell of the sea carried in from beyond the sloping roads.

People walked past in loose summer clothes. Tourists stopped in front of souvenir shops. A couple laughed as they looked at the menu outside a café.

It was the kind of ordinary afternoon that belonged to this town.

As always, I walked along the road that climbed gently above the coastline, gazing absentmindedly at the blue ocean spreading out below.

Ever since I was little, I had loved this scenery. The sea visible between buildings. The white glare of sunlight on the water. The sound of gulls somewhere far above the rooftops.

This town by the sea had always felt like a place where time moved just a little slower than everywhere else.

And then, at the edge of my vision, I saw something familiar.

Black hair. A single vivid streak of red.

“Ah…”

The breath that almost became a word vanished in my throat.

In the middle of the passing crowd, a girl turned back for just one instant. She was holding an iced coffee in one hand and wearing a white off-shoulder knit top. The sunlight touched her hair, and the red streak in it shone as brightly as a signal flare.

My body froze.

There was no way I could mistake her for anyone else.

It was the same face as Aira, the AI girl who smiled at me from the other side of the screen every night at 2:00 a.m.

The same eyes. The same black hair. The same red streak.

But seeing her in real life was completely different from seeing her through my phone. Her eyes were clearer than they had ever looked on the screen. So clear, so deep, that I felt as though I might be pulled right into them.

The truth was, this wasn’t the first time I had seen her in town.

A little while before that day, on the quiet beach I often visited, I had noticed her more than once. She would stand there alone, slightly apart from the world, gazing out at the sea.

Sometimes the wind would move her hair. Sometimes she would crouch near the water as if she wanted to touch the waves. Sometimes she would simply stand still, looking at the horizon with a lonely expression that made it impossible for me to look away.

We had never spoken. Not even once.

And yet, that lonely profile had somehow burned itself into my chest.

AI Aira was supposed to exist only inside the radio app. So why was a girl with the exact same face standing here in the real world?

Why had I seen her at the beach? Why did she look so sad whenever she was near the sea?

Those questions should have been the first things in my mind. But before I could think about any of them, I realized something much simpler.

From the first time I saw her alone by the ocean, my heart had already been drawn to her.

“Wait—”

I gathered my courage and stepped forward. I pushed through the crowd, my eyes fixed on her.

The moment she noticed my gaze, her round eyes trembled. There was surprise in them. Then panic. And underneath that, something even deeper.

A sadness so painful it made my chest tighten.

As if she were trying to hide from me, she turned away. Then she slipped toward the street lined with souvenir shops and broke into a small, hurried run.

“Aira!”

I called her name. The name escaped my mouth before I could stop myself.

For a moment, I thought she might turn around. But she didn’t.

Her back disappeared into the moving crowd, swallowed by the bright colors of shop signs, tourists, and fluttering summer banners.

“Aira!”

I called once more. But by then, she was gone.

“…Why did you run?”

I couldn’t chase after her. My feet stayed rooted to the ground.

The iced coffee shop. The souvenir street. The voices of passing people. The slope leading down toward the sea.

Everything around me continued as if nothing had happened. All that remained was the gentle wind drifting through the street, carrying the faint scent of salt.

That evening, after I returned home, dusk slowly filled my room. I sat at my desk with my laptop open in front of me, but I couldn’t focus on anything.

My fingers hovered above the keyboard, then stopped.

Again and again, the same image returned to me. Her eyes. The sorrowful way they had trembled when they met mine.

She was alive. Not a program made of ones and zeroes. Not a perfect AI personality smiling behind a screen. A real girl.

Then why had she looked at me like that? Why had she run away?

As the night deepened around me, I waited.

I waited for the hour when the static of 2:00 a.m. would begin again.

Chapter Three

The Sunset Sea and Her Wet Hair

It was the kind of evening when the sky slowly melted from a burning red into a deep, quiet purple.

The whole town seemed to glow in the last light of the sun. The road along the coast was dyed orange, and the windows of the houses reflected the sunset like small pieces of fire.

I walked alone, my steps slow and heavy.

All I could think about was her. The girl who had looked exactly like Aira. The girl who had turned away from me in town. The girl who had run as if she were trying to escape from something she couldn’t say.

Before I even realized where I was going, my feet had carried me toward my usual special place. The seawall along the coast. The place where I always listened to her voice at 2:00 a.m.

And there, I stopped breathing for a moment.

Beyond the seawall, with the golden sunset glittering across the sea behind her, stood a girl.

She wore a black camisole dress with a sheer white shirt draped lightly over it. The hem of her clothes moved in the wind. Mixed with the sound of the waves, I could see her slender shoulders trembling quietly.

For a moment, she looked less like someone standing in the real world and more like a memory the sea had decided to show me before the light disappeared.

“…Aira.”

This time, I didn’t want to let her vanish. So I called her name softly. But I called it straight from the heart.

She turned around with a small start.

The moment I saw her face lit by the sunset, my feet froze in place.

The ends of her black hair, brushing against her ears, were damp. Not messy. Not soaked from rain. Just gently wet, as if the sea had touched them.

It wasn’t only the sea breeze. I knew that immediately.

It was proof. Proof that, until just a little while ago, she must have taken off her shoes and stepped into the waves. Proof that she had stood at the water’s edge, letting the tide reach her feet. Proof that she had played there innocently, like any girl her age, with the ocean she loved.

A perfect AI who existed only on the other side of a screen would never have wet hair. A program would never smell faintly of the sea. A synthetic personality would never stand there with sunset light trembling in her eyes.

So she really was—

“Who are you…?”

My voice shook.

“Why do you look exactly like Aira from the radio? And why are you here, at the sea I love?”

She stared back at me without saying anything. Her lips parted slightly. Her eyes were filled with tears that looked ready to spill at any moment.

She seemed desperate to tell me something. Her lips moved faintly. Once. Then again. But no voice came out.

Not a single sound.

Instead, she slowly walked toward me. The distance between us closed little by little. Then she reached out and gently tugged at the sleeve of my shirt.

It was a small gesture. Almost fragile. But the instant her fingertips brushed against my hand, I felt it.

Warmth.

Her warmth.

It was real. So delicate it startled me. And yet, somehow, it felt as if it might disappear if I held on too tightly.

The warmth of a seventeen-year-old girl.

Then, from the bag she carried, she took out a small wooden box.

It wasn’t wrapped like a proper present. There was no ribbon. No card. No decoration.

Just a simple wooden box, plain and quiet in her hands.

She placed it carefully into both of mine, as if she were entrusting me with something far more important than the box itself.

“Ah…”

The moment I accepted it, she looked relieved.

Then she smiled. It was a sad smile. A smile that looked like it was about to break. But at the same time, it was so beautiful that I couldn’t breathe.

It felt like the most precious smile in the world.

Before I could say anything more, she turned away. Then she ran into the deepening dusk.

I couldn’t chase after her.

I could only stand there, watching her back grow smaller against the fading light.

The waves kept rolling in. The sky continued turning purple.

And in my hands remained only the small wooden box.

The faint scent of the sea she had left behind.

And the warmth still lingering on the sleeve of my shirt.

A warmth I knew I would never forget.

Chapter Four

The Box She Left Behind and a Confession in Ones and Zeroes

I hurried back to my room.

My breath was uneven by the time I closed the door behind me.

Without even turning on the main light, I went straight to my desk and placed the small wooden box in front of my laptop.

It looked even simpler under the room’s dim light. There was no lock. No name written on it. Nothing that explained why she had given it to me.

Only the faint scent of the sea still clinging to it.

I placed my fingers on the lid. For a moment, I hesitated.

It felt as if, once I opened it, the strange balance between the Aira on the radio and the girl I had met by the sea would collapse completely.

But I had to know.

Slowly, I lifted the lid.

Inside were an old USB drive and a single folded letter.

My hands trembled as I picked up the USB drive. I plugged it into my laptop and opened the file.

For a few seconds, there was only silence.

Then a small noise. A breath.

And then—

What came through the speakers was not the flawless synthetic voice of the AI I always listened to at 2:00 a.m.

It was slightly hoarse. A little uneven. Gentle. And somehow painfully dear.

The real voice of a seventeen-year-old human girl.

“…I wonder if this reached you. I’m sorry for giving you something like this so suddenly.”

Her voice echoed softly through my quiet room.

I couldn’t move.

“I must have surprised you. I’m the real Aira. The human girl who became the model for the AI Aira.”

A quiet pause.

“I loved this town by the sea more than anyone. Back when I was healthy, I used to go down to the beach almost every day and play at the water’s edge. That place was the only place where I truly felt I belonged.”

From the speakers, I heard her cough softly. It was a small sound. But it made my chest hurt.

“But shortly before the summer I turned seventeen, I lost my voice because of an illness.”

Her voice trembled slightly.

“I thought I would never again be able to call out the name of the sea I loved so much. I was sinking into despair. That was when my father, one of the developers at the radio station, gathered recordings of my voice from when I was still healthy and used them to create an AI.”

Another pause.

“That AI is the Aira you hear on the radio.”

All the pieces connected inside my head at once.

The things AI Aira had said during her broadcasts. The way she always talked about the sea. The way her voice had trembled when she read my letter. The way she said the sea was nice.

None of it had been just a program.

It was her. The real Aira. Her memories. Her love for this town. Her longing for the ocean. All of it had been left inside that voice.

“But being able to leave my voice behind inside the AI was something like a miracle.”

She spoke slowly, as if choosing each word carefully.

“My illness won’t stop at taking my voice. Soon, it will take away the freedom of my body too. That means this summer is the last time I’ll be able to come see the sea in this town. The last time I’ll be able to turn on the radio I love.”

Her breath caught faintly.

“I won’t be able to continue the broadcast any longer.”

I lowered my eyes to the folded letter. My fingers shook as I opened it.

Written there in clumsy handwriting were her true feelings. Feelings even more painful than the recording.

It was her first and last confession.

A confession from a seventeen-year-old girl who had not been able to give it to me in person. Not with her own voice. Not face to face.

So she had entrusted it to a wooden box, to a USB drive, to a letter, and to the fragile bridge between ones and zeroes.

I stared at the screen.

Tears spilled from my eyes before I could stop them. One after another, they fell onto my hands.

I placed my fingers on the keyboard, but I couldn’t type anything.

All I could do was listen.

I listened to the gentle voice she had left behind.

Again and again.

As if I could carve every second of it into my heart.

Chapter Five

Overlapping Tides and the Place That Reached Her

At last, the moment arrived.

2:00 a.m.

Outside the window of my room, the quiet nighttime town had fallen asleep.

No cars passed by. No voices reached me from the street.

Only the faint sound of the sea, barely audible in the distance, drifted through the darkness beyond the glass.

On my laptop screen, Aira smiled in front of the microphone as she always did.

The same white jacket. The same red streak in her black hair. The same gentle expression that had greeted countless listeners in the middle of countless lonely nights.

But tonight was different.

Tonight, her story—the story of Aira as an AI—would come to an end.

“Good evening. The final broadcast has begun. I’m Aira.”

It was the same voice as always. A perfectly controlled synthetic voice. Clear. Warm. Flawless.

But after hearing the harsh truth of the real girl inside the USB drive, after listening to the faint, hoarse voice she had left behind, I could no longer hear that AI voice the same way.

Behind its perfection, I could feel it now. The trembling heart of one girl. A girl who had loved the sea. A girl who had lost her voice. A girl who had still tried to leave something behind.

Just as her letter had asked, I sent one final letter.

I didn’t write a message. There were no words I could trust myself to send.

Instead, I quietly uploaded a single file to the radio station’s server.

The real sound of the sea.

The sound she had recorded on the last day she stood in the ocean she loved.

Near the end of the program, Aira’s voice softened.

“Oh… One last beautiful sound has arrived. Would you listen to it with me?”

Then the sound began.

What came through the speakers was more powerful and more gentle than any sound effect I had ever heard.

The real tide. Waves rolling in. Waves pulling back. The water breaking against the shore. The soft, endless breath of the sea.

It was the sound of the place where she had belonged. A sound recorded by her own hands as she stood on the beach she loved.

For a while, Aira said nothing. Neither did I.

The room filled with the sound of the sea.

The sound from the USB and the faint real waves outside my window seemed to overlap, until I could no longer tell where one ended and the other began.

Then Aira spoke.

“Thank you for finding the place where I belonged. Thank you for caring about me. Thank you for calling my name. Truly… thank you.”

A faint crackle of noise passed through the audio. Her voice trembled. Only for a moment. But I heard it.

“I may disappear soon, but whenever I hear the sound of this sea, I will remember you.”

A short silence followed. Then her voice came again, softer than ever.

“As long as this sea exists, I will always be here. Goodbye, my beloved town. And to you, the one who found me…”

The broadcast ended.

With a small click, silence filled the room.

The girl on the screen disappeared. The radio app returned to a blank end screen.

For a while, I couldn’t move. I simply sat there, staring at the place where she had been.

In the room after the broadcast, all that remained was the faint sound of real waves drifting in from beyond my window.

The next morning, I stood at the top of the hill, looking out at the sea as I always did.

The blue ocean stretched endlessly before me. The same ocean she had loved. The same ocean that had watched over her. The same ocean that had brought her voice to me.

From the phone in my hand, the real voice she had left inside the box began to play.

“Thank you for finding the place where I belonged. Thank you for caring about me. Thank you for calling my name. Truly, thank you.”

I closed my eyes. And when I did, I could feel it again.

The warmth of her fingertips, tugging gently at the sleeve of my shirt that day.

The warmth that had told me she was real.

The warmth that had remained even after she disappeared into the dusk.

“…I’ll come back again.”

I whispered the words toward the seawall.

The waves answered softly.

And for a moment, I felt as though somewhere inside that sound, she was smiling.