Friday night the house was darker than the street around it.
Kairo stood in the shadow of the vending machine at the end of the road and looked at it for a long time. Same gate. Same potted plant, dead now. A new padlock on the front door, bright and ugly, the kind a property agent fitted when a building changed hands.
No lights. No cars parked where cars shouldn't be.
That meant nothing. People who were good at watching didn't park cars.
"Two rings means someone's coming," Aoi said quietly beside him. She had a bicycle with her — an old one, a basket on the front, a bell on the handlebar. "Three means leave now. Don't finish what you're doing. Just leave."
"And one?"
"One means I'm cold." A pause. "Don't take long."
She wheeled the bicycle across the road to the small park opposite, sat on the bench under the streetlight that didn't work, and became a girl waiting for someone who was late.
Kairo went around the back.
The window was the same one the men had used. He knew that the moment his gloved fingers touched the frame — a dull pulse through the leather, six people passing through this gap in the dark. He pulled his hand back before it could open further.
Not tonight. He hadn't come for them.
The latch had never been repaired. He eased the window up and climbed through.
The house hit him all at once.
Not the violent rush of the gate. Something worse — something slower. Every surface was full. Seventeen years of his own life layered on top of his parents' lives, layered on top of whatever they had carried before him. Footsteps on the stairs. His mother's hand on the banister ten thousand times. His father's weight in the chair by the window.
He stood in the dark kitchen and breathed.
In for four. Out for four.
Don't reach for it. Don't push it away. You are simply present.
The flood eased. Became a tide. Became something he could stand inside.
He took the glove off his right hand.
The kitchen table first. The chipped corner where the morning light always fell. He touched it and got breakfast — a thousand breakfasts, the same conversations with different words, the Meiji period and the Nakamura cat and eat well today.
He moved his hand away before it could hold him.
He had not come for that either.
Mother hid it where she thought no one would ever think to look.
He walked through the ground floor with his bare hand trailing along the walls, reading the way Zenjiro had taught him. Choosing the layer. His mother's layer. Her particular way of touching things without looking at them — never quite the same twice, like the melodies she hummed.
The study. The hallway. The storage cupboard under the stairs.
Nothing that felt hidden. Everything that felt like her.
The stairs.
He climbed them slowly. Halfway up he felt his father on the top step — that night, the stillness before he came down — and he kept climbing and didn't stop and didn't look.
His parents' room was first on the landing.
He stood at the threshold without going in. The futons had been taken away — evidence, or cleaning, he didn't know which. The room was bare tatami and an empty alcove and the faint square on the wall where a scroll used to hang.
He crouched and touched the tatami at the doorway.
His mother, kneeling here in the early morning, folding cloth with her mind somewhere else. His father beside her, speaking low. He couldn't catch the words — only the shape of them, the careful rhythm of two people planning something they didn't want to say out loud.
And then, underneath that, something that made him pull his hand away fast.
Both of them standing in this doorway, looking down the landing toward his room.
Not afraid for themselves.
Afraid for the boy asleep at the end of the hall.
He stayed crouched there for a moment with his bare hand pressed against his knee. Then he stood and walked on, because Aoi was sitting in the cold and there was no time for this, and because if he stayed he wasn't sure he would be able to leave.
His bedroom door was open.
The room was exactly as he had left it. Bed made. Uniform shirt still on the hanger by the wardrobe. His history textbook on the desk, open to the Meiji period.
He stood in the doorway and understood, finally, why he hadn't come up here the first time.
Then he went in.
He searched it the way he would have searched a stranger's room. Desk. Drawers. Under the bed. The wardrobe. The loose floorboard by the window he had used to hide comics from his mother when he was nine.
His mother had known about the floorboard. She had always known.
Nothing.
He sat on the edge of the bed. His head was starting to ache behind his eyes, the tight pressure that came when he held the Echosense open too long.
He lay back.
Looked up.
The plaster above his bed had a hairline crack running from the light fixture toward the east wall.
He had been meaning to mention it for two years. He never did — partly because it never got worse. It had stayed exactly as it was. Two years without spreading a millimetre.
Cracks spread.
That was what cracks did.
Kairo stood on the bed. Reached up. Laid his bare palm flat across the crack.
His mother was standing exactly where he was standing.
Night. The room dark except for the thin grey light from the street. And someone asleep in the bed below her feet — himself, fifteen years old, one arm over his face the way he still slept.
She stood on the edge of the mattress, careful not to wake him, and pressed a thin blade into the plaster. Slow. Precise. Opening the crack along a line she had already chosen.
She slid something inside.
Then she smoothed the edge with her thumb, and stood there with her palm flat against the ceiling, exactly as he was standing now.
And she hummed.
Very softly, so he wouldn't wake. The nameless melody. The one that was never the same twice.
Except this time Kairo heard it properly — not with his ears but through the plaster, through her hand, through the deliberate focused intent she was pouring into this spot the way a person poured water into a cup. She wasn't humming to herself.
She was humming to him. To whoever would stand here one day with the right kind of hands.
The melody moved up. Down. Paused in a place it shouldn't have paused. Moved again.
It wasn't nameless.
It had never been nameless.
He pulled his hand back and he was shaking, and his eyes were wet, and he didn't care about either.
He opened the crack with the edge of his house key. The plaster gave along a line that had already been cut.
Inside was a folded piece of paper.
Old music staff paper, the kind sold in stationery shops for school students. Five lines drawn across it, over and over. Notes written in pencil in his mother's small, perfect hand. A melody. Her melody — written down, fixed, every pause in the place it should never have been.
At the top, one line.
For Kairo. When you are ready to listen.
He folded it along its crease and put it in his jacket pocket with the others.
Five folded papers now.
Outside, a bicycle bell rang.
Once.
He let out a breath. Aoi was cold. He stepped down from the bed—
The bell rang again.
Two.
He went completely still.
Downstairs, a key turned in the new padlock. The front door opened. Footsteps crossed the hallway — one person, unhurried, careful. They stopped at the bottom of the stairs.
Exactly where his father had stood.
A torch clicked on. The beam climbed the stairwell wall and stopped just short of his open door.
"I know you're up there, Mitsune."
Ren's voice. Quiet. Not calling for anyone else.
"You have maybe four minutes before the people I report to notice I'm not where I said I'd be," he said. "So come down. We need to talk about your mother."