September 1987. The lingering summer heat still clung to Tokyo, sharp and unrelenting.
Setagaya Ward, Shimokitazawa.
This was another sacred ground for the city's youth, yet it breathed an entirely different spirit from Shibuya's polished, capital-heavy trends. Shimokitazawa felt more like a labyrinth woven from everyday life and cluttered beauty. Second-hand vintage shops, underground theaters, and independent record stores crowded the narrow alleys, filling the air with the aroma of curry and the dusty scent of old clothes.
"Clang—clang—"
An Odakyu Line train roared past, its wind pressure fierce, the rhythmic clatter of wheels on tracks making the ground tremble.
On a triangular patch of wasteland beside the railway fence—once littered with rusted bicycles and discarded furniture—the ground had been cleared completely. In its place stood five massive freight containers painted a vivid lemon yellow.
They resembled an abrupt set of Lego bricks tossed carelessly onto the gray terrain. Stenciled in simple black on their sides was the logo:
S.A. KARAOKE BOX
There were no neon lights, no greeting hostesses, not even a proper entrance. Only a part-time college student in work clothes sat behind a folding table, listlessly swatting at mosquitoes.
"Hey, Tanaka, are you sure this is the place?"
Four college students trudged along the narrow gravel path, guitar bags and backpacks slung over their shoulders. At the rear, Kenta hunched his neck, visibly reluctant.
He was a classic late-Showa introvert. What he dreaded most in university life were the after-parties following club gatherings—those dreaded trips to snack bars for karaoke. The red-velvet sofas, the heavily made-up Mama-san shoving a microphone into his hand, the leering drunk salarymen eyeing the girls in their group—every off-key note he sang had left him wishing he could vanish into the floor.
"This is it! I heard it's brand new and ridiculously cheap!" the leader called, pointing at the containers. "Only one thousand yen per hour, no matter how many people. No minimum spend, and you can even bring your own drinks!"
"Containers?" Kenta eyed the iron boxes with unease. "Can you actually sing inside those? Won't we suffocate?"
"Let's just try it. It's right next to the station anyway."
Before he could protest further, his friends dragged him to the folding table.
"Four people, one hour."
"Got it. Box number three."
The part-timer pocketed the cash, handed them a basket of coins for the karaoke machine and two microphones, then pointed toward the back. "Drinks are from the vending machine over there. Restroom's the blue portable toilet outside."
How crude, Kenta thought.
They approached Container No. 3 and heaved open the heavy iron door, which creaked like the entrance to a cold-storage unit.
A rush of cool air greeted them.
Kenta blinked in surprise. They had actually installed a powerful air conditioner inside.
The space was modest—roughly six or seven tatami mats—with walls lined in cheap but brightly colored sound-absorbing foam. A simple U-shaped leather sofa faced a small coffee table, and at the far end a television was mounted on the wall above an old coin-operated karaoke machine and two large speakers.
The iron door thudded shut.
All external sound vanished.
The roar of passing trains, the drone of cicadas, the chatter of passersby—everything was sealed away by thick metal and foam. The world shrank to the soft whoosh of the air-conditioning vent.
"Wow, the soundproofing is incredible!" the leader shouted. His voice carried a slight echo in the enclosed space. "You could scream your lungs out in here and no one would hear a thing."
An unexpected sense of security bloomed in Kenta's chest.
No Mama-san. No drunk strangers. Just the four of them—best friends.
This was a private island that belonged entirely to them.
"Hurry up! I want to sing BOØWY!"
His friends eagerly flipped through the thick songbook and fed coins into the machine. Music filled the box. In the small space the sound quality proved surprisingly rich, the heavy bass vibrating pleasantly against their chests.
They took turns belting out rock songs, the atmosphere quickly warming.
"Kenta! Your turn!"
The microphone was thrust into his hand.
"I… I can't…" Kenta tried to push it back. "I really don't know how to sing…"
"Stop complaining! There's no one else here!"
His friend chose Seiko Matsuda's "Akai Sweet Pea"—a gentle ballad popular at mixers of the era.
The prelude began.
Kenta gripped the microphone, palms slick with sweat. Staring at the lyrics scrolling on the screen, his throat tightened and he missed his cue.
"Red… red…"
He managed two lines, painfully off-key, his voice trembling as though on the verge of tears.
His friends did not mock him, yet their suppressed smiles still burned his ears crimson.
"Eh? What's this?"
One of the girls beside the machine spotted an extra red button labeled in handwritten characters: Guide Vocal (Trial Run).
"Guide Vocal? Is someone going to teach you how to sing?"
Curious, she pressed it.
The next instant, a clear female voice joined the thin instrumental track.
"The swing by the shore is swaying…"
Kenta froze.
That voice was neither cloyingly sweet like Seiko Matsuda's nor coldly synthetic like ordinary karaoke tapes. It was clean and steady, with a faint husky warmth—like an older sister sitting beside him, gently humming the melody, holding his hand, and guiding him note by note.
Her solid pitch acted like an invisible rope, instantly steadying his wavering voice.
Kenta began to sing along.
"The swing by the shore is swaying…"
This time he stayed in tune.
The female voice became a gentle foundation beneath his own thin tone. Whenever he wavered, it drew him back before panic could set in.
When the song ended, his friends burst into applause.
"Kenta! You actually sounded good this time!"
"Whose voice is that guide vocal? It feels so comforting."
"I don't recognize the singer. Is it a cover?"
Kenta stared at the ending screen, still holding the microphone. For the first time, singing no longer felt like punishment. It felt like release.
In this iron box wrapped in foam and solitude, guided by an unknown female voice, he had rediscovered a long-lost sense of ease.
"Pick… pick another one for me," he said softly, cheeks still flushed. "I want to try Akina Nakamori."
At the same moment, in the Marunouchi headquarters of Saionji Industries, a large conference table was covered with heavy canvas bags.
"Clatter—"
Endo untied one bag and poured its contents onto the polished mahogany. Hundreds of 100-yen coins spilled out like a silver river, ringing brightly against the wood.
"This is the revenue from the Shimokitazawa pilot over the past week."
Itakura stood nearby, holding a data report, his face a mixture of excitement and disbelief.
"Five containers, operating twelve hours a day—the unmanned system isn't ready yet. Average turnover rate: one hundred percent. In other words, as long as we're open, every box is occupied. On weekends, people line up outside."
Endo adjusted his reading glasses and frowned at the pile of coins.
"It's all in small change…"
As a former CFO accustomed to managing hundreds of millions, he could not help but feel this business carried the unmistakable scent of petty cash.
"President, isn't this operation rather trivial? We have to hire two security guards just to transport the coins to the bank. And look at the numbers—even with full occupancy, the revenue per customer is tiny. One thousand yen per hour. At the end of the month, five boxes will barely clear a million yen. That's less than one day's drink sales in our Akasaka building."
Shuichi sat at the head of the table in silence, staring at the coins as though lost in thought.
"That is not the correct way to calculate it," Satsuki said quietly. She sat beside her father, idly turning a warm 100-yen coin between her fingers.
"The Pink Building in Akasaka earns from the rich. That market is highly profitable but strictly limited. In all of Tokyo, only a few tens of thousands of women can afford fifteen-thousand-yen afternoon tea."
She stood the coin on the table and flicked it gently. It spun into a shimmering silver sphere beneath the lights.
"But this earns from everyone."
"That Shimokitazawa plot is only fifty tsubo. Because it lies beside the tracks, noisy and awkwardly triangular, you could not even build a proper two-story structure there. The previous owner treated it as wasteland and still paid property tax every year. How much did we pay for it?"
"Five million yen," Endo replied.
"Exactly. Five million for the land, plus five second-hand containers and basic renovation—total investment under ten million. Now it generates roughly one million yen in monthly cash flow. Annual return exceeds one hundred percent."
Satsuki pressed her finger down on the spinning coin, stopping it.
"And this is only five boxes."
She rose and walked to the large map of Tokyo Metropolis on the wall, its surface dotted with hundreds of red marks.
"Look at these points. These are all the 'garbage plots' we have quietly acquired over the past year at rock-bottom prices—beneath high-voltage lines, beside railway tracks, at the end of dead-end alleys, under overpasses. To traditional real-estate developers they are worthless."
She turned, meeting Endo's stunned gaze.
"But what if we scatter iron boxes across them? Five hundred. A thousand. Ten thousand…"
"When these coins flow together into an ocean, they will become the most formidable cash engine in all Japan."
"More importantly—" Satsuki took another report from Itakura. "Ninety percent of customers mentioned the 'Guide Vocal' feature. They said the voice made them feel at ease and gave them the courage to sing. Sachiko has recorded fewer than twenty songs, yet the effect is already remarkable."
Itakura nodded vigorously. "Some guests even asked who the singer was and wanted to buy her cassette tapes."
Shuichi scanned the handwritten feedback, a faint smile touching his lips. "It seems we have truly struck gold."
He paused, then added, "However, Satsuki, there is one issue. The scale is still too small. Shimokitazawa may be packed, but it remains a subculture enclave. To the general public, the idea of 'crawling into a container to sing' still feels odd—something only delinquents would do."
"True," Satsuki agreed, returning to her seat. "The spark is still modest. We need a gust of wind—a wind strong enough to carry the concept of private solitude across the entire country, making everyone believe that hiding away alone to sing is both cool and perfectly normal."
She glanced out the window at the September sky, where dark clouds gathered.
"No need to rush," she said calmly. "The wind is already on its way."
"Until then, Itakura, have Sachiko continue recording. Expand the library to one hundred songs. Endo, instruct the factory to accelerate container conversion and stock the warehouses."
"When the opportunity arrives, these yellow iron boxes will bloom like dandelions across every corner of Tokyo overnight."
The conference room fell silent. Only the soft clatter of Endo gathering the coins remained—the most primitive, humble, yet undeniably real sound of wealth.
Meanwhile, inside the iron box in Shimokitazawa, the introverted boy named Kenta closed his eyes and, guided by that unknown female voice, unleashed the most heartfelt high note of his youth.
The spark had been lit. The east wind was coming. Soon the prairie fire would rage.