Nine days before the earthquake, the Sumida River window was seventy percent complete.
Timeline-Kenji worked on the bridge installation in the early mornings, when the maintenance access was active and the tourist foot traffic was minimal. He worked in the methodical, thorough way that the two versions of him had identified as their shared professional strength: not fast, but right. Taking the extra ten minutes to verify the resonance emitter mounting before sealing it rather than sealing it and finding the problem later.
Transit-Kenji worked on the transit protocol documents in Reiko's kitchen, translating the engineering specifications into instructions that non-engineers could follow. This was harder than the engineering. Engineering had precise language; emergency communication had to have language that was precise without requiring precision from the reader, which was an entirely different skill.
He had help.
Aiko sat beside him on the third day and said: "You're writing for yourself. You're writing for the person who already knows what this means."
"I'm writing what needs to be communicated."
"Yes. You're writing it in engineering language to a person who is going to be terrified and in a hurry. Try it again." She put her hand on his. "What do you need them to know? Not the full picture. The one thing."
He thought about it. "That the bridge is safe. That coming through is safe. That what's on the other side is safe."
"Then say that first. Everything else is detail."
He rewrote the document.
Aiko went through it afterward and made fourteen edits. He kept all fourteen.
The children, in the meantime, were navigating the complex territory of starting new schools while carrying the knowledge of what was building in a world they'd left behind.
Riku started the Bunkyo school on the fourth day. He went wearing the identity of Riku Fujita, which was his name with one character changed, which was the minimum viable difference and also somehow exactly the right distance: enough to be other, not enough to be lost.
The school was not significantly different from his school in the original Tokyo. Same uniform cut, slightly different color. Same density of people in the corridors during passing period. Same specific social gravity of a school hallway — the way people moved around each other, the invisible maps of allegiance and avoidance that everyone maintained without consciously drawing.
He was eating lunch alone on the roof — a universal school tradition, the person who doesn't yet know where they fit taking their food to the highest accessible place — when someone sat down beside him.
"You're new," the person said. A girl, approximately his age, with paint on her hands that was not from school art class — the specific spectrum of pigments suggested something more personal.
"First week."
"Where from?"
"Shibuya." The cover story — simple, plausible, requiring nothing more elaborate.
"I'm Akemi." She didn't ask his name back, which suggested she'd already looked at the class register. "You look like someone who's carrying something."
"Everyone's carrying something."
"True. But some people's something is recently heavier than other people's."
He looked at her. She was eating her lunch with the efficient attention of someone who has decided to be in this conversation and is also eating, because both things are possible.
"What are you painting?" he asked.
"A city that doesn't exist yet. I dream the same city every night for about a year and then I paint it." She looked at her hands. "It's very tall. Very lit up. Clouds below the lower streets."
Riku stopped eating.
"What does it feel like," he said carefully, "when you're in it?"
"Like being in a place that knows things you don't. And will tell you, eventually, if you stay."
He looked at this girl — Akemi, with paint on her hands and a city in her dreams that he had walked through in a trial environment three weeks ago — and thought: the system leaves traces. Somewhere in the resonance of the transit infrastructure, the environments exist as more than simulations. They exist as something the world can feel at the edges.
He thought: I am going to need to tell my father about this.
Hana started her school in Bunkyo on the same day. She noted the differences from her previous school with the taxonomic attention she gave all new environments: the way the lunch period was organized, the different texts on the literature syllabus, the arrangement of the library.
The library was arranged differently. The classification system was the same — Dewey Decimal — but the physical arrangement of the shelves had a logic she couldn't immediately place. She asked the librarian.
The librarian, who was perhaps sixty and had the look of someone who finds most things uninteresting except books, considered the question with unusual seriousness. "The arrangement reflects the way the books are used," she said. "Not their subject. Things that are read together tend to be shelved together, regardless of classification. It requires updating as reading patterns change."
Hana thought about the Remembering Forest, and its code, and Sora's explanation of the index. She thought about what it meant to organize by use rather than by category.
She thought about her third spreadsheet column: EVIDENCE OF CHOICE.
She spent the rest of lunch period in the library.
In the evenings, the family had dinner together in the Bunkyo apartment. Aiko cooked, which was the first entirely normal thing she had done since the Shinkansen, and the normalness of it had a sharpness to it — the specific quality of ordinary things in the immediate aftermath of extraordinary ones, when you have been reminded why ordinary things matter.
Nine days before the earthquake, at the dinner table with rice and miso and the ginkgo tree visible through the window, Kenji looked at his family.
He looked at Aiko, who was talking to Hana about the library organization system and smiling with the engaged brightness she got when she encountered something that appealed to her theory of how things should work. He looked at Riku, who was eating and listening to his mother with the careful, deliberate attention he brought to things he didn't want to admit he found interesting. He looked at Hana, who was building an argument with the precise structure of someone who has been making arguments since she could talk.
He thought: safe. They are safe.
He thought: twenty-nine families in Koto Ward are going to come through the bridge window when it opens. And Hideo's data puts the secondary event magnitude at 8.4 to 8.6, and with the revised capacity matrix the window can handle ninety families per event, and there are two events possible within the transit window — one before the primary earthquake and one in the gap between primary and secondary.
He thought: one hundred and eighty families. That's the current plan. That's the limit of what he had.
He thought about Tomoko's map with its green circles. Twenty-nine yes families in six blocks. She had been expanding the survey radius.
He thought: what is the number? What is the number of families he can reach before the window closes?
His phone buzzed with a message from the system relay. He looked at it under the table.
— ✦ —
The message was from Tomoko. It read: I EXPANDED THE MAP TO TEN BLOCKS. 87 YES FAMILIES. ALSO MORI HIDEO FOUND SOMETHING IN HIS FATHER'S NOTEBOOKS THAT CHANGES THINGS. HE SAYS YOUR FATHER NEEDS TO SEE IT IMMEDIATELY AND I AGREE. It was followed by a photograph of a notebook page. Transit-Kenji looked at it and the blood left his face. Not the methane hydrate data — something else, a separate set of calculations in the same notebook, in the same careful handwriting, on a page dated three months ago. The calculations were seismic. Not predictive seismic — monitoring seismic. The record of readings taken over time, from a monitoring station in the bay, the kind of data that you built up over months and that told you not where the earthquake would be but when it was building toward its maximum stress state. He read the numbers. He ran the conversion in his head — the number of data points, the rate of change, the projected endpoint. He looked at the numbers again. Nine days before the earthquake. That had been the outer confidence interval. The inner was six days. But the monitoring data in Mori's notebooks — collected by a man who had died six weeks ago, who had been watching the bay for a year before that, who had recorded data points that no official monitoring station had captured because his methodology was non-standard and his findings were dismissed — the monitoring data said: the inner confidence interval was wrong. Not six days. Not nine days. He looked up at his family around the dinner table. Aiko was still talking. Hana was still listening. Riku had looked up from his food and was watching his father's face with the specific, careful attention of someone who has learned that the information is sometimes in his father's face rather than his father's words. He saw it. He put down his chopsticks. "Dad," Riku said quietly. "How long?" Kenji looked at the photograph of the notebook page. He looked at his family. "Four days," he said.