Tanaka Reiko made tea the way she did everything else: efficiently, without excess, with the precision of someone who had decided long ago exactly how much effort a thing was worth and did not deviate from that calculation.
The house was larger inside than it appeared from the street — a renovation decision, she explained, made fifteen years ago when the number of transitioning families began to require more beds. The ground floor was living space and a large kitchen. The upper floor was six small rooms, each equipped with the basics required by a person who has arrived in a new world with nothing: fresh clothing in neutral sizes, a cash envelope, a binder containing essential documents.
The documents, Kenji discovered when she handed him a binder, were complete.
New identities. Not fraudulent ones — the system had integrated with the administrative infrastructure of the destination timeline at a level he hadn't designed. Or rather, hadn't designed yet: looking at the documentation, he could see the architecture of something that had been built incrementally over thirty years, version by version, by a woman who had arrived here with the skills of a secondment tax accountant and had apparently decided that bureaucratic integration was the most important engineering project she could undertake.
"You built identity infrastructure for transit families," he said.
"The first family came through with nothing. I had nothing when I arrived. We figured it out together over about three years — finding the gaps in the registration system, the points where new residents could be entered without triggering cross-checks with the national family registry. It got easier when my contact in the government office retired and her replacement turned out to be —" She allowed herself a small smile. "— sympathetic."
"How many families have come through?"
"Before yours? Forty-three. Not all from the same origin timeline — the system has multiple origin points. Several from a timeline that experienced a volcanic event six years ago. Eight from a coastal flooding series. The rest from events I was never fully briefed on." She looked at him steadily. "The man who built the original system was not very good at briefing. He was —" A pause. "He was thorough in his engineering and brief in his explanations."
Kenji heard the slight edge in it and recognized it: the specific frustration of people who have been implementing someone else's plans without full context.
"I'm sorry," he said.
She looked at him. "You're not him."
"I'm enough like him that the apology is relevant."
She considered this for a moment and apparently decided it was sufficient. "The identity documentation in your binder is for a family named Fujita. Kenji Fujita — structural engineer, which keeps your credentials intact. Aiko Fujita — literature teacher, same. Riku and Hana Fujita. The documentation is in the registry. Schools are enrolled for the children. A housing contract is active for an apartment in Bunkyo — on the third floor, which I chose because your seismic assessment suggested corner units on the third floor of post-2000 construction were safest in a moderate event."
"This timeline's seismic —"
"No major event expected in the next two hundred years. Different fault stress pattern. I had it assessed." She looked at him with the satisfaction of someone delivering information they are certain about. "You are safe here. Your family is safe here. That is not a conditional statement."
Kenji put his hand flat on the binder. He did this because something in his chest was doing something unmanageable and the cold surface of the binder was a useful object.
He had calculated his entire adult life around the concept of safe and had never once believed it was something he could simply be told. He had calculated and planned and reinforced and monitored and built escape routes and still — at the bottom of every projection, in the uncertainty interval of every model — there had been the number he couldn't reduce to zero.
Reiko watched him process this with the patience of someone who had watched many transitioning families process it.
"It takes time," she said. "The people who come through carrying the most — it takes them the longest to believe the danger is past."
He nodded, once.
"The others," he said, when he could. "Mei, Ren. The other Riku."
"Secondary documentation. Mei Fujita, placed as Hana's cousin visiting from Osaka. Ren Nakamura — I'll need his full background to integrate correctly. The second Riku —" She frowned, not unkindly, at the situation. "That one is more complicated. Two people with the same face cannot share the same city without creating resonance interference. They will need to live in different districts, maintain different names, and minimize proximity."
"He won't want to be far," Kenji said.
"He won't need to be. Different school district is sufficient. The resonance interference at moderate distance is manageable — it feels like a headache for anyone with strong system sensitivity, and a vague unease for everyone else." She paused. "There's a precedent. A pair of siblings from the volcano timeline — identical twins. They live in Koenji and Shimokitazawa. They meet twice a week and wear different glasses and have agreed not to be photographed together. It works."
She poured more tea into cups that had been placed for exactly the right number of people, which told Kenji that she'd known the group composition before they arrived, which told him the system had been briefing her through channels he hadn't yet fully mapped.
"You said my other self can feel the resonance," Kenji said. "The version of me who already lives here."
"Yes. He's been sensitive since the system first began running under his city. Most long-term residents of this timeline don't register the cross-timeline activity. But he —" She set down her teapot. "He has the same sensitivity you have. It runs in the family. He knows something large arrived. He has been asking questions."
"What kind of questions?"
"The kind that begin with he has filed three independent reports with the national geological survey in the past week suggesting anomalous subsurface resonance in the Chiyoda district. Two of those reports name this street."
"He doesn't know about portals."
"He doesn't know about portals. He knows something is happening under the earth near his city that doesn't match any geological model he has access to. He is — from everything I know of the type — not the kind of person who leaves things unmeasured."
Kenji looked at Aiko across the table. Aiko looked back at him with the expression that meant: we are going to have to deal with this and I have already begun planning how.
"We can't approach him," Kenji said.
"Correct. Direct resonance contact between two versions of the same individual creates —"
"I know what it creates. I built the system. What I mean is that I can't go to him and explain, because the explanation doesn't work without revealing the entire architecture, and the architecture shouldn't be common knowledge in this timeline."
"No," Reiko agreed. "It shouldn't."
"So what do I do about a version of myself who is about to find my house?"
— ✦ —
Reiko picked up her cup and drank her tea with the unhurried composure of a woman who has been handling impossible situations for thirty years and has found that unhurried composure is the most useful tool. "You do nothing," she said. "Because the version of you in this timeline doesn't need to find the house. He already knows what's at the address. He filed his third report this morning." She set her cup down. "The address he named in the report was not this street. It was the Sumida River bridge. The Koto Ward side." The room went quiet. Kenji set down his tea. The Sumida River bridge — the secondary activation point, the site Dr. Saito had told him to build the second transit window. The location Tomoko Abe was even now crossing her city to mark. "He's been monitoring the secondary site," Kenji said. "Without knowing what it is." "Yes." "For how long?" "Three weeks." Kenji thought of a version of himself in this safe world, going to work every morning, assessing buildings, having ordinary dinners, who had nevertheless been waking up three weeks ago with the specific unease of an engineer who has felt something wrong in the ground beneath his city and has been methodically, quietly, alone — investigating. "He's me," Kenji said. "Which means he's already figured out most of it." "Yes," Reiko said. "And this morning he was at the bridge at six a.m. And this afternoon —" She glanced toward the front of the house. "He's been sitting in the bookshop next door for the last hour."