Nami hit him before he had finished the story.
Not hard. An open palm to the centre of his chest, fast enough that he didn't see it — he felt it, a half second too late, and took one step back to keep his feet.
"You went into a Souen building," she said. "At night. Alone."
"Aoi was outside."
"A schoolgirl with a bicycle." Her voice didn't rise. It went flatter, which was worse. "You walked into a house they had owned for three days, on a date they gave you, and the only reason you are standing on this mountain is that a Souen decided not to kill you."
"I know."
"Do you?"
Kairo held her eyes. "Yes."
The courtyard was grey and cold. Frost on the edges of the stone. Zenjiro sat on the temple steps with his hands folded, saying nothing, letting it happen.
Nami looked at Kairo a moment longer.
"Next time," she said, "you tell me before. Not after."
"Would you have stopped me?"
"No." She turned away. "I would have come."
She walked to the far wall and began wrapping her hands, and Kairo understood that this was the closest thing to an apology either of them was going to offer.
They sat at the low table. Kairo laid the staff paper between the tea cups and unfolded it.
His mother's pencil notes sat in their neat rows. Five lines, over and over. At the top — For Kairo. When you are ready to listen.
Nami looked at it without touching it. "Can you read music?"
"No."
"Can you?" she asked Zenjiro.
"I cannot read anything," the old man said mildly. "Hum it."
Kairo stared at him. "I don't know how it goes."
"Yes, you do. You heard it every morning of your life."
Kairo looked down at the paper.
He didn't need the notes. He knew that the moment he tried. The melody was in him the way the house had been in him — something he had lived inside so long he had stopped hearing it. He closed his eyes and let it come.
It came out quiet and uncertain at first. Then steadier. Up. Down. The strange pause in the middle, where a normal melody would have kept moving.
He stopped.
Zenjiro's face had changed.
It was very small. The kind of change that would have meant nothing on another man. On Zenjiro it was like watching a mountain shift its weight.
"Again," he said softly.
Kairo hummed it again.
When he finished, the old man was quiet for a long time.
"Your mother was Memory Keeper," he said at last. "Do you understand what that title meant?"
"She kept the clan's records."
"She was the clan's records." Zenjiro wrapped his hands around his cup. "Paper burns. Files are stolen. Computers are read by people who should not read them. The Memory Keeper carries what cannot be written down, and when it must be passed on, she builds a road for it."
"A road."
"A memory road. A melody. Each phrase is tied to a place she touched while humming it — deliberately, with full intent, so the echo would hold. To anyone else it is only a song." He tilted his head toward Kairo. "To someone with Echosense, it is a map. You hum the phrase, you touch the place, and the place answers."
Nami was very still. "I've heard of those. I thought they were a story."
"Most people did," Zenjiro said. "That was the point."
Kairo looked at the paper. At the pause in the middle, where the melody held its breath.
"She hummed it in the kitchen every morning," he said slowly. "For years."
"Then every morning," Zenjiro said, "she was teaching it to you."
Kairo took his glove off.
He laid his palm on the staff paper, closed his eyes, and hummed the first phrase.
The paper was cold. Then it wasn't.
His mother's hand, writing. Pencil. A small desk lamp. And behind the image, like light through a thin curtain — somewhere else.
Moss. Deep green, wet with rain. Stone steps worn to a dip in the centre. A lantern of old grey stone, standing alone at a turn in a garden path, its roof furred with lichen.
On the base of the lantern, carved small enough to miss, a crane with its wings open.
His mother's hand was resting on it.
She was humming.
The image held for three seconds. Four. Then his head filled with a pressure like deep water and he pulled his hand away.
He opened his eyes. Nami had moved to his side without his hearing her.
"What did you see?"
"A stone lantern." His voice came out rough. "In a garden. Moss. Old steps. There's a crane carved on the base."
"Where?"
"I don't know. It isn't anywhere I've been."
"There are more than a thousand temples in this city," Nami said. "Most of them have gardens. Most of the gardens have lanterns."
"Not with a Mitsune crane," Zenjiro said.
"Do you know it?"
The old man was quiet a moment. "I know of three places the Mitsune once marked that way. Two were sold decades ago." He paused. "The third was on your friend's list."
Kairo went cold.
Kenji's seven addresses. A closed tea house in Higashiyama.
"Souen already bought it," he said.
"Souen bought the building," Zenjiro said. "The question is whether they know what is standing in its garden."
That afternoon Daisuke put him down in six seconds.
Kairo hadn't expected it. His head was still aching from the lantern, and he stepped into the first exchange half expecting to be on his back before he'd set his feet.
Instead the melody was still going in him. Quietly, underneath everything, the way it had gone underneath every breakfast of his life. And somewhere in the second exchange he realised he had stopped reaching for Daisuke's residue. He was just moving — reading and not-reading at once, the pattern and the present sitting on top of each other the way Nami had said they should.
Daisuke's hand still found his collar. The courtyard still tilted. The stone still came up to meet his shoulder.
But it took six seconds.
It was the first time Kairo had lasted longer than five.
Nobody said anything about it. Zenjiro simply looked toward the shelf where the wooden case sat, and then away again.
Before he left, Nami walked him to the gate.
"The list," she said. "The Shiraze man gave you a date. The date was false."
"He was fed it. Ren said Souen gave false paperwork to anyone who was watching."
"Exactly." She stopped at the gate. "Anyone who was watching. Souen knew someone was reading their purchases. They put a false date where that someone would find it, and then they waited to see who walked into the house."
Kairo understood a second before she said it.
"They know about Kenji."
"They know someone reads their ledgers and passes it on." Nami's face was hard. "It won't take them long to work out who. And when they do, they won't send a boy with a torch and a guilty conscience."
"I'll warn him."
"Warn him today," she said. "Not Monday."
He tried.
He called the bookshop from the payphone at Kurama station. It rang eleven times. No one answered.
He took the train back into the city and walked to Demachiyanagi in the dark. The blue awning. The paperbacks in the window. The sign on the door that said closed.
The door was locked. The lights were off.
He took his glove off and touched the handle.
Kenji, turning the key. Hours ago — the residue already thinning. His hands quick and unsteady. And beside him, closer than a father usually stood to his daughter, Aoi, holding a bag she had packed in a hurry.
Neither of them had looked back at the shop.
He stood there a long time.
Then he went back to Harue's and lay awake until dawn with the melody in his head, going round and round.
On Monday, Aoi's desk was empty.