The white space was changing.
Riku felt it before he saw it — the ground-that-wasn't-ground shifting slightly under his feet, the quality of the white deepening in some places and thinning in others, the way paper is deep when it's new and thins where it has been handled too many times. He had been in the nexus for what felt like approximately twenty minutes, with his mother, and in that time the nexus had flickered twice.
"That's the anchor," his mother said, the second time it happened. She said it the way she said most things — directly, without softening, because Aiko Tanaka had decided at some point in her life that the kindest thing you could do for someone was to give them accurate information. "The bridge told me. The system is over capacity. The anchor is holding it, but —"
"Barely," Riku said.
"Yes."
They were standing in the center of the white space, which was approximately the size of a large gymnasium if you were measuring by feel and impossible to measure any other way, because the edges of the nexus were not where they appeared to be and approaching them changed their apparent distance. Riku had tried this twice, walking toward what looked like a wall of white, and each time the white had receded at the same rate he approached, keeping the apparent space constant. It was not a room. It was a condition.
"Where are they coming in?" he asked.
His mother pointed. "Hana's portal should open from that direction — that's where the forest environment connects to the nexus. Your father's is —" She hesitated. "I'm not sure about your father's. His trial environment is Tokyo Station. But something went wrong with his portal assignment."
"What went wrong?"
She told him what the bridge had said. Not everything — there were parts she was still processing herself — but the core of it: the resonance misassignment, the accidental second door, the possibility that someone else had come through a portal that should have been Kenji's.
Riku was quiet for a moment. "So Dad might have someone extra in his trial."
"Possibly."
"And the extra person —"
"Has no path home unless Kenji creates one."
"Which takes resources."
"Which takes resources we may not have, if the anchor continues degrading at the current rate."
The nexus flickered a third time. Longer this time — not a blink but a sustained dimming, like a lamp on the edge of its power supply, and in the dimming, Riku heard something. Not a sound from outside — a sound from inside the nexus itself, from its structure, from the white field that held them. It was like the sound a building makes before it fails: not a crack but a creak. Not an impact but a settling.
"We should do something useful while we wait," his mother said.
"What can we do from here?"
"Talk."
He looked at her.
"We have — we're going to have things to work through, your father and I. He's kept something large from me for a long time. I know that now. And I've chosen to trust him, which is the right choice, and I'm also going to be very angry about it, which is also the right choice and they are not in conflict. But you and I —" She looked at him directly. "I don't know what you've been carrying this year. I've seen you carrying something. I haven't asked."
Riku thought about the floating city, about the girl who hadn't looked at him expecting help and the specific quality of that look. He thought about the children in the holding corridor and the choice to say I'll take responsibility even without the means to back it up. He thought about Yuki at the echo portal, about the thirty-two percent and what she'd said: the risk is the same risk I've been willing to take since I stayed.
"I've been angry," he said. "For about two years. At — broadly. At a lot of things."
"Broadly?"
"At the fact that things are hard and people make them harder. At the way the systems work — any system, Polaris City up there, but also ours. The way the people who don't have enough always end up needing to be smarter and faster and more careful than the people who do. It's — it's not fair, and fairness is apparently something I care about a lot more than I let on, and caring about it while being unable to do anything about it is —"
He stopped.
His mother waited.
"Exhausting," he said. "It's exhausting. And then there's the guilt about the exhaustion, because there are people doing more with less and they don't get to be exhausted, and —"
"You're allowed to be exhausted," Aiko said. Quietly, without decoration. The way she said the true things.
"I know."
"And you stopped on that walkway."
He looked up. "How do you —"
"The trials show the person. The person you chose to be, in the environment they gave you, is the answer to the question you're asking about yourself. About what your anger is for."
He thought about this.
"Not fair systems," he said slowly. "Against unfair ones."
"Yes."
"That's going to be inconvenient for the rest of my life."
"Yes," Aiko said. "Welcome to having a purpose."
The nexus held them in its shifting white — mother and son, in the space between worlds — and Riku thought: this is what the trial was for. Not just the floating city test, not just the choice on the walkway. This. The after. The conversation you couldn't have until the emergency made it necessary.
He thought: Dad built this whole system and the thing it did, ultimately, is put us all in rooms we couldn't leave until we said the things that needed saying. That's either the most roundabout therapy in the history of any universe, or it's the most precisely engineered intervention possible. He wasn't sure which.
A portal bloomed in the direction his mother had indicated: Hana's direction, the connection point for the forest environment. It opened slowly, the way her portal had always been described — not the quick blue-white snatch of his and his mother's, but something warmer, more deliberate.
Hana stepped through.
She was holding the hand of a girl Riku didn't recognize — small, young-looking, with eyes that were older than the rest of her — and behind them both, stepping through the portal's edge with the slightly dazed expression of someone for whom the transit was entirely new, a boy of perhaps twelve with the same not-quite-young eyes.
Riku's mother was already moving toward Hana.
Hana saw her coming and for a single unguarded second was exactly thirteen: the composed observer collapsed entirely, and she ran the last three steps, and Aiko caught her.
The nexus held them. All of them.
— ✦ —
Riku was watching his sister and his mother when the nexus spoke for the first time. Not the AI's voice — not the other-Kenji's measured, grief-worn delivery. The nexus itself, from its structure, from whatever intelligence was woven into the white field that contained them. It was a voice without gender or age, calm as geometry, saying: "Three of four. The fourth portal is delayed. The anchor has entered critical deterioration. Time remaining before structural failure: seventeen minutes." Seventeen minutes. Riku looked at his mother over his sister's shoulder. His mother looked back at him. "Dad," Hana said, pulling back from the hold, already scanning the white space with those cataloguing eyes. "Where's Dad?" And then, from the direction of Kenji's trial environment — not one portal but two, opening simultaneously, one clean and one stuttering, one his father's resonance signature and one something entirely different — something moved in the white. And then the portals stopped opening. And from beyond them, from inside the trial environment that should have closed when the family was assembled, a sound: a collapse, a grind, the specific grinding of a system pushing past its limit. The AI's voice: "ANCHOR CRITICAL. STRUCTURAL FAILURE IN —" And then silence. The portals had not opened. And from the direction they'd almost opened, someone was pounding on the other side.