In a world where the impossible hides in plain sight, graduate student Yuuma Kiritani takes a tutoring job to make ends meet—only to discover his new student, Shizuku Minase, harbors a terrifying secret. With a single touch, she can shrink anything... including people. Now Yuuma stands barely a fingertip tall in a living room transformed into a vast, perilous wilderness, at the mercy of a curious girl who sees him as nothing more than a fascinating experiment. Trapped in a cage of his own insign
Cage at the Fingertips - Fingertips Left in the Air — An Apology That Can't Be Atone For, a Hand That Can't Be Taken
Evening light slanted into the Minase living room.
Shizuku stayed down, palms pressed to the floor, forehead still bowed against the tatami. Her shoulders trembled in small, tight shudders. A voice scraped out of her throat like something being torn loose.
" I'm sorry... I'm sorry... I did so many terrible things to you, Sensei... I'm so sorry..."
Yuuma stood over her, looking down.
His back was straight, both hands at his sides, not a single finger moving. Behind the thin silver-rimmed glasses, his eyes stayed their deep brown, fixed quietly on the back of her head.
(Three weeks.)
He turned the number over in his mind.
Twenty-one days. Five hundred four hours. Thirty thousand two hundred forty minutes.
All that time, he had simply existed—small—on her palm, inside a box, at the bottom of water, on the tips of her nails, on the floor.
" I never understood how scared you were, Sensei... putting you in the pencil case, dropping you in the fish tank... rolling you around on my nails with Saya... I'm truly, truly sorry..."
Her voice was soaked through with tears. Word endings dissolved, sentences broke apart, and still she kept bowing, again and again, palms flat against the floor.
A faint sound—her forehead brushing the tatami.
Yuuma listened to it.
(That's the sound of an apology.)
(But this sound can't erase those other sounds.)
In his mind, the click of the pencil case lid closing came back. The roar of water as he struck the tank's surface. The laughter of the two girls as he rolled across Saya's fingernails. And the wind pressure of a slipper sole passing just beside him.
All of it had happened only days ago.
" Please... Sensei... forgive me... I don't know what to do anymore..."
Finally, Shizuku lifted her face.
Her cheeks were wet with tears. Her bangs were a mess. Her amber eyes were red and swollen, the tip of her nose bright red too. The dimple on her right cheek was nowhere to be found.
Yuuma looked back at her with eyes that gave away nothing.
"...Minase-san."
His voice was low, flat.
Shizuku's shoulders jumped.
" Y-yes..."
"Go wash your face. Then we'll talk."
For a moment, she looked as though she hadn't understood the words at all. Then she nodded, over and over, and rose unsteadily to her feet.
Yuuma watched her back as she headed for the washroom.
Silence fell over the living room.
Slowly, he walked to the table.
This table. Until three weeks ago, he had sat here teaching her math. Now its surface rested at the height of his waist. An ordinary height. And yet, for those three weeks, this table had been a towering monument that pierced the sky.
He touched one of its legs with his right hand.
The feel of wood. Cold. Hard.
(This was a pillar in the world I lived in.)
He looked at his left wrist.
A small scar marked it. The trace of a shrinking. The proof that he had spent three weeks exposed to her power.
He traced the scar with his fingertip.
(It won't disappear.)
(This scar won't disappear.)
Quietly, he pushed up the bridge of his glasses.
After a while, Shizuku came back.
She had washed her face and fixed her hair. But her eyes were still red, and now and then she sniffled. Standing in the doorway of the living room, she asked timidly, as if searching his expression for a sign.
" ...Um, Sensei."
"Sit."
He pointed to the chair across the table from him.
Shizuku gave a small nod and lowered herself into it. Her hands were clenched tight in her lap.
Yuuma sat down across from her.
The table lay between them.
Once, this distance had been the ordinary distance of a tutor and his student. Now it was a wall, and it was his.
" Sensei... I, um..."
She started to say something.
Yuuma raised one hand slightly, cutting her off.
"I'll speak first."
Shizuku closed her mouth.
Yuuma lowered his eyes a little.
(Get the logic in order.)
(What am I about to say?)
(Don't get swept up in feeling. One fact at a time.)
He drew a slow breath.
"I'll keep tutoring you."
Her face shot up.
" Huh..."
"Three times a week—Monday, Wednesday, Friday. Same hours as before. I won't ask for a raise, either."
Light flickered in her eyes.
" R-really...?"
A faint hope crept into her voice.
Yuuma met that light head-on.
"However."
She went still.
"We won't go back to the way things were."
His voice was quiet.
But that quiet was cold, like the bottom of a tank.
The hope drained slowly from her face.
" ...What do you mean?"
"Exactly what I said. I'll keep tutoring you. But we won't go back to the relationship we had. I don't intend to chat with you about nothing. I don't intend to make small talk during breaks. I teach what needs teaching, you learn what needs learning. That's all we are."
He said it all in one breath.
Shizuku bit her lip.
" ...Is that because of what I did to you? Is that why you're saying this?"
"Yes."
The answer came instantly.
Her shoulders shook.
" But... but you just said you'd keep tutoring me..."
"I said I'd keep tutoring. That's for my own living. I eat on what this job pays. I can't afford to quit. And your grades still aren't where they need to be for your first-choice school. If I don't teach you, you'll fail the entrance exams."
He stated only the facts, evenly.
"So I'll continue. But that doesn't mean I've forgiven you."
Shizuku hung her head.
Her fingertips clenched tight against her knees.
" ...I understand..."
Her voice was barely there.
Yuuma said nothing more.
Silence flowed between them.
Outside the window, the wind stirred the leaves of the garden trees.
Dusk in the Midorigaoka residential district. In this quiet neighborhood, in this house, right now, a deep gulf had been carved between two people.
How long had they sat like that?
Shizuku raised her head, hesitantly.
Her eyes were still wet.
" ...Then, Sensei."
Yuuma looked at her without a word.
" Then, from now on—as friends..."
As she spoke, she slowly extended her right hand across the table.
White, slender fingers.
Their tips trembled faintly.
Yuuma stared at that hand.
(This hand.)
(This hand picked me up.)
(This hand shut me in a box.)
(This hand dropped me into water.)
(This hand rolled me across her nails.)
One after another, the sensations of her fingertips from those three weeks came flooding back.
Flicked by a fingertip.
Pinched by a fingertip.
Rolled by a fingertip.
Breathed on by a fingertip.
Every last memory of it.
Slowly, Yuuma drew both his hands behind his back.
Her hand stopped, hanging in midair.
Her eyes went wide.
" ...Sensei?"
Still watching her hand, he spoke quietly.
"With one fingertip, you took everything from me for three weeks."
His voice was low and heavy.
Her hand twitched.
"There were nights I couldn't breathe because that finger touched me. Inside the pencil case. At the bottom of the tank. On Saya's nails. Every time your finger came near, my body shrank in on itself whether I wanted it to or not. Do you have any idea what that feels like?"
His words were calm.
But behind that calm, three weeks' worth of swallowed anger and terror was breathing, very much alive.
"If an apology could erase that time, how much easier it would be."
He said it, and closed his mouth.
Shizuku couldn't pull her offered hand back, and couldn't leave it there either—it simply hovered in the air.
Only her fingertips trembled, just slightly.
Yuuma turned away.
He faced the table, pulled out a chair, and sat.
He took his reference book from his bag.
Opened it.
The rustle of paper echoed through the quiet living room.
Shizuku slowly lowered her outstretched hand.
She stared at her own fingertips.
(My fingers...)
(These fingers did that to Sensei...)
The feel of rolling him across her nails, the tiny cry when he hit the tank water, the existence that had nearly vanished beneath a slipper—all of it came back to her like a slideshow.
She gripped her own fingers hard with her other hand.
That was when it happened.
Her gaze was drawn to Yuuma's left wrist.
When he'd pulled the reference book from his bag, his sleeve had ridden up a little.
Beneath it was a small scar, like a bruise.
Under the evening light, it seemed to glimmer faintly.
Shizuku stopped breathing.
(That...)
(Is that from me...?)
For the first time, a weight settled onto her chest—the realization that she had left behind something she could not erase.
That night.
After Yuuma left, Shizuku sat alone on her bed, knees hugged to her chest.
She stared at her open right palm.
(It didn't reach.)
(My hand didn't reach him.)
Tears spilled from her eyes, one after another.
She cried without making a sound.
(I was laughing in front of Saya. I was laughing. I never understood how frightened he was.)
(Even when he nearly disappeared under that slipper, I just assumed he was fine.)
She clenched her palm tight.
(He wouldn't take that hand.)
(Of course he wouldn't. After what I did.)
(But...)
(But even so, I...)
Her tears wouldn't stop.
From the next room, the faint murmur of her parents' voices drifted through the wall.
No one noticed her struggle.
Shizuku picked up her smartphone.
She opened the screen and pulled up her message thread with Saya.
She began typing in the input field.
'What do you think of Yuuma?'
She stared at the words.
Then, slowly, without pressing send, she deleted them, one character at a time.
The screen returned to the empty input field.
She set the phone down on the bed.
Once more, she stared at her right palm.
(My hand can't hold on to anything.)
She closed her eyes.
Tears burned hot behind her lids.
The next evening.
The intercom rang.
Shizuku went to the entryway and opened the door.
Yuuma stood there in his suit.
His expression was the same as always—composed, without inflection.
Looking at his face, she felt her chest tighten for just a moment.
But she forced a smile.
" Good evening, Sensei. It's math today, right?"
Her voice was a little stiff.
Yuuma gave a slight nod.
"Yeah. Let's begin."
He took off his shoes and headed for the living room.
Shizuku watched his back for a moment.
(Just like always...)
(And yet something's different.)
She pressed a hand to her chest.
Her heart was beating a little faster.
Across the living room table, they faced each other.
Shizuku spread out her homework worksheet.
Yuuma looked at it quietly.
"You got this one wrong."
He pointed at a spot on the page.
His fingertip came to rest very close to her hand.
Shizuku's body gave a startled jerk.
At her reaction, Yuuma's finger stopped—just for an instant.
Then, as if nothing had happened, he went on explaining.
"The expansion of this expression is wrong. The sign flips here. So the answer comes out like this."
With his own pen, he began writing the correct formula in the margin.
Shizuku stared at the tip of his pen.
(Sensei's fingers...)
(Those fingers almost touched my hand.)
(And I flinched.)
She clenched her hands in her lap.
Yuuma looked up.
"Are you listening?"
" Huh—oh, yeah. I'm listening."
She nodded hastily.
He glanced at her once, then dropped his gaze back to the worksheet.
His fingertip moved slowly across the page.
Following it with her eyes, Shizuku thought:
(I want to touch him.)
(But I can't.)
(I'm not someone who's allowed to touch him.)
Softly, beneath the table, she clenched her own fingertips.
In the middle of the lesson, Shizuku spoke up hesitantly.
" ...Sensei."
Yuuma answered without looking up from his book.
"What."
" That thing on your left wrist..."
His fingers stopped dead.
Shizuku was staring at his left wrist.
" Did I do that?"
Slowly, Yuuma looked at his left wrist.
Beneath the sleeve was a small scar.
He gazed at it for a moment.
"Yeah."
His voice was short, matter-of-fact.
"It's a scar that won't go away."
Her heart gave a heavy throb.
" ...I'll find a way to erase it."
Her voice was shaking.
Yuuma looked at her.
"Search all you like."
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