Tomoko Abe told her mother first.
She did this at six o'clock in the evening on the day she returned from the trial station, sitting at the kitchen table of their apartment in the Koto Ward with the specific determination of someone who has decided that the time for keeping things to herself is over. Her mother — a radio engineer who had taught her daughter to listen before she taught her to speak, who had filled their apartment with receivers and antennae and the patient monitoring of frequencies that most people never thought about — listened without interrupting.
When Tomoko finished, her mother said: "The frequency on the 31.7 band. I found that three months ago and I thought it was bleed from a subway transit system."
"It's not."
"No." Her mother looked at her with the assessing look that Tomoko had grown up trying to satisfy — the look that meant: I am evaluating whether you have done the work, and I will know if you haven't. "You went through a portal."
"Yes."
"Without telling me."
"I thought if I told you, you'd either think I was wrong and try to talk me out of it, or think I was right and come with me, and if you came with me the apartment would have no one in it and no one to maintain the receiver and the frequency monitoring. Someone has to keep the receiver running. The receiver is how the new people in the other Tokyo send messages back."
Her mother looked at her for a long moment. Then she looked at the receiver. Then she looked at her daughter again. "You left me here as the communications anchor."
"Yes."
"Without telling me."
"I was fourteen and in a hurry and I'm sorry."
Another long moment. Then her mother stood up and went to the receiver and checked the frequency setting and made a small adjustment with the focused calm of someone recalibrating. "How many families?" she asked.
"Eventually? The engineer said up to seventy per transit event from the bridge window alone, once it's built. But right now, the immediate priority is the neighborhood. The buildings between here and the river." Tomoko unfolded the map she'd been carrying since she returned from the trial station — not a downloaded map, a hand-drawn one, with her own risk assessments marked in three colors: red for highest structural risk, orange for significant risk, yellow for moderate. "I've been doing this for the past month. Learning the building ages. Noting the ones that don't have the seismic upgrades."
Her mother looked at the map.
It covered six city blocks. Each building was marked with its construction decade, its assessed structural category from public records, and Tomoko's own risk rating. It was not a professional assessment — Tomoko was fourteen, not an engineer — but it was thorough, systematic, and based on a methodology she could explain and defend.
"This took a month," her mother said.
"Six weeks."
"You've been doing this for six weeks."
"I've been doing this since I understood the earthquake was coming. I needed to know which buildings, which people, where to start."
Her mother put her hand on top of Tomoko's on the map. "You should have told me sooner," she said.
"I know."
"I could have helped."
"I know." Tomoko looked at the map and the three colors and the six weeks of careful, solitary work. "I'm learning," she said. "About asking for help."
Her mother looked at her for a moment longer. Then: "Who do we tell first?"
They told the building manager of their own building first, which was strategic: Mrs. Okazaki had managed the building for twenty-two years and knew every resident and their family histories and their approximate schedules and, crucially, which of them would listen and which would need to be approached in a specific way. She was also, as Tomoko had assessed, one of those people whose credibility operated as a multiplier: things Mrs. Okazaki said were believed because Mrs. Okazaki did not say things that weren't true.
Tomoko explained it to her carefully: the earthquake prediction, the portal system, the bridge window not yet operational, the timeline. She did not overexplain or underexplain. She had rehearsed the explanation and knew exactly how long it took — eleven minutes — and she gave it in eleven minutes and then answered Mrs. Okazaki's questions.
Mrs. Okazaki asked seven questions. Six of them were practical. One of them was: "Why are you telling me and not the government?"
"Because the government timeline for responding to a private citizen's earthquake prediction with no institutional backing is months, and we have days. The system works on voluntary transit — families have to choose to come through. And the people who will choose to listen to a voluntary earthquake evacuation system are the ones who already have networks of trust. You are a network of trust in this building. Mrs. Okazaki nodded once. Then she called the residents' association meeting for the following morning.
In four days, Tomoko told fifty-three families.
Not all of them believed her. Some of them dismissed her entirely — a fourteen-year-old with a hand-drawn map was not the messenger most people expected for existential news. Some of them were afraid and expressed the fear as hostility. Some of them listened and then retreated into the specific paralysis that disaster preparation sometimes produced: the place where you understood the danger and could not act on it because action made it real.
But twenty-nine families said yes.
Twenty-nine families said: tell me when the bridge window opens and how to reach it and what we need to bring. They said it with varying degrees of fear and various quality of comprehension, but they said yes.
Tomoko wrote all twenty-nine names on a separate page of the map and marked their buildings with a green circle. Then she sent the coordinate message through the system — her mother helped with the frequency alignment — and waited for the response from the other side.
The response came twelve hours later. Not a message but a document: the transit instructions for the Sumida River window, formatted in the plain, clear language of someone who had learned to write emergency procedure.
At the bottom of the document, a note in different handwriting — older, more deliberate: THE WINDOW OPENS IN ELEVEN DAYS. YOU WILL FEEL THE FREQUENCY CHANGE WHEN IT'S READY. TRUST THE FEELING. IT IS DESIGNED TO REACH YOU.
Tomoko read the note twice. She folded the document into her jacket pocket, where she kept the things that mattered.
She went back to her map.
Twenty-nine was not enough.
— ✦ —
She was adding a seventh block to the map — extending her survey radius, pushing her hand-drawn coverage further toward the river — when she felt it. Not a sound. Not a physical sensation. A feeling in the frequency-tuned part of her brain that her mother's radio work had developed: the specific impression of a signal arriving at the edge of reception range, present but not yet clear. She looked up from the map. The receiver across the room — the one her mother had recalibrated — was showing a new reading. Not on the main frequency. On the secondary band, the one no transit traffic had ever used. The reading was irregular, pulsed, the signature of a human operator using the frequency rather than an automated system. Someone who had found the frequency by accident, or by design, and was transmitting on it without knowing what they were transmitting into. The pulse pattern resolved, slowly, into something her mother had taught her: the basic structure of a distress call. Old-style, pre-digital, the kind that predated the protocols they used now. Someone was calling for help on a frequency that shouldn't have had anyone listening. Tomoko pulled her chair up to the receiver. She said, carefully into the transmitter: "This is Koto Ward. I hear you. Who's there?" A long silence. And then a voice — not clear, not steady, breaking through the static with the specific effort of someone transmitting from a place where the signal had no good reason to exist: a boy's voice, young, frightened, careful. "My name is Hideo Mori. I'm in the Koto Ward. I — I don't know if this is reaching anyone. I found the frequency in my father's things after he —" A long pause. "After he died. He had a notebook. He had been — he was looking at something. About the earth. About what was coming." Another pause, longer. "I think he knew about the portals."