Kairo found the problem on a Tuesday morning when he opened his banking app and stared at the number for longer than he normally would.
It wasn't empty. It wasn't close to empty. But it had been moving in one direction for six months and the thing about a number moving in one direction is that eventually it reaches zero. He'd known that. He'd just not thought about it because before, zero didn't matter. One person. Takeout. Nowhere to be.
He closed the app.
Opened it again.
Closed it.
Yuki was still asleep on the couch with her hair everywhere and her sleeve-covered hands tucked under her cheek. She'd migrated again in the night, which she always did, fully committed to using as much of the available surface as possible despite being 5'2" and therefore not needing that much surface.
He looked at her.
Then at his phone.
In the game he'd been rich in the way that happened when you were the only person to clear every floor solo and farmed the same bosses forty-odd times each because there was nothing else to do. He'd never cashed most of it out because he hadn't needed to. He'd been one person who ordered takeout and didn't go anywhere and had no one to spend anything on.
The server had shut down six months ago.
The currency was gone.
He put his phone face down on the desk and looked at the ceiling.
"You're doing the face," Yuki said, without opening her eyes.
"I don't have a face."
"The thinking one. It's different." She didn't move. "What's wrong."
"Nothing."
"Kairo."
"Go back to sleep."
She opened one eye. Looked at him across the room. Closed it again. "It's money."
He said nothing.
"It's money," she said, more certain.
"How did you—"
"You had your phone out and then you put it down fast and sat there." She pushed herself up slowly, hair doing several things at once, sleeve falling over her hand. "How bad."
"It's not bad."
"How not bad."
"Fine enough that we're fine right now."
"That's not a number."
He looked at her. She looked back at him with the patience of someone who'd figured out that waiting worked better than pushing. He rubbed the back of his neck.
"Six months of nothing coming in," he said. "It adds up."
She was quiet for a moment. Then she got up, crossed to the desk, and folded herself into her chair with her shoulder against his arm. She picked up his phone — he let her — and opened the browser.
She found what she was looking for in under a minute.
He watched her face as she read.
The comment sections had gotten bad.
Not aggressive. Desperate, which was different and worse. Threads going back four months across every platform, the same words repeating in different combinations. White hair. Red eyes. Shinjuku footage. Twenty-three seconds. Please come back. We're running out of time.
Someone had done the math six weeks ago, posted it with sources, and it had spread the way things spread when the information is accurate and awful.
Floors 10 to 20: containment fails in three months. After that the gates stop pulling things in and start pushing things out. Floor 10 creatures in a populated city, and modern weapons had already been confirmed useless against anything past Floor 5. The military had tested everything they had on early gate monsters. Nothing worked above a certain point. The monsters just kept moving.
Floors 30 to 50: seven months before breach.
Floors 60 to 80: estimated thirteen months based on the lower floor patterns, though nobody had confirmed this publicly because confirming it meant confirming what came after it.
Floors 90 to 99: the researchers who'd run the numbers hadn't shared them. One had posted something and deleted it within the hour. The screenshot had spread anyway. The people who'd seen it and understood what it meant had mostly gone quiet and stayed that way.
Nobody could explain why floors 20 to 30 were exempt. The pattern just stopped there — a gap in a sequence that should have been continuous. People were hoping the same applied to 50 to 60, to 80 to 90. Hoping loudly in comment sections with the energy of people who needed a pattern to hold because the alternative was unsurvivable.
The three month window was next month.
"Next month," Yuki said quietly.
"Yes."
She kept reading. He watched her. Further down the thread it wasn't experts — just people. A woman from Sapporo whose building was six blocks from a Floor 18 gate and hadn't slept properly in two months. A man who mentioned losing someone in an early outbreak before the cordon systems improved. A teenager asking in very plain and exhausted language why the person from the Shinjuku footage hadn't come back. A hundred and twelve replies to that comment. None of them had an answer.
Yuki put the phone down.
She sat still for a moment.
"You already knew all of this," she said.
"Yes."
"For how long."
He didn't answer. She read the silence correctly.
"Kairo."
"I was thinking about how to do it," he said. "Not whether."
She looked at him. "There's a difference."
"Yes."
She turned to the map on the laptop — the one that had been open for six months, dots in red and yellow across Japan. She looked at it properly this time, reading the colour coding she'd never asked about directly.
"Red is next month," she said.
"Yes."
"All of those."
"All of those."
She was quiet for a long time. There was a lot of red.
"The money," she said.
"The government has been trying to contact me for four months," he said. "Official channels first. Then through the school. That's part of why I agreed to go."
She looked at him slowly. "You went to the school to see if they'd make contact."
"You wanted to go," he said. "That was the reason. The contact was secondary."
"You let me think it was just my idea."
"It was your idea. I had a secondary reason."
She stared at him. Her expression did several things. "That's really annoying," she said.
"I know."
"New folder."
"I know."
She looked back at the map. The thinking silence settled between them, the comfortable kind that had weight without being heavy.
"How much are you going to ask for," she said.
"More than they want to pay."
"How much more."
"Floors 10 to 20," he said. "Ten thousand per gate."
She looked at him.
"Floors 30 to 40, fifty thousand. Floor 40s, a hundred thousand per gate."
"A hundred thousand—"
"It's the impossible range," he said. "Nobody else can touch it. The guilds cleared up to 26 and lost people doing it. Floor 40 monsters would end every guild currently operating within the first sixty seconds." He paused. "Floor 50s, two hundred and fifty thousand. Floor 60s, half a million."
Yuki had stopped moving entirely. She was just looking at him.
"Floor 70s," he said. "Two million."
"Two—"
"A fishing vessel went silent from a Floor 70 gate," he said. "Whatever pulled it under didn't leave debris. Two million is reasonable."
She opened her mouth. Closed it.
"Floor 80s," he said. "Ten million per gate."
The room went very quiet.
"And the 90s," she said. Her voice came out slightly different than usual.
"Five hundred million," he said. "Per gate."
She sat completely still for three full seconds.
"Kairo," she said.
"Yes."
"That's insane."
"One boss," he said. "One single boss from the Floor 90s gets out and it doesn't end a city. It doesn't end a country." He looked at her directly. "It ends the planet. One monster. By itself. Everything."
She stared at him.
"The fishing vessel was Floor 70," he said. "That thing didn't even breach. It passed near the gate and the vessel was gone. A Floor 90 boss wouldn't pass near anything. There wouldn't be time. It would just be over."
"Over," she said.
"All of it," he said. "One monster. The planet."
The silence in the apartment had a different weight now. Outside the window the city was doing its Tuesday thing — people and traffic and delivery drones — completely unaware of what was sitting on a ticking clock one cleared gate away from never existing again.
"Five hundred million," she said. Very quietly.
"Per gate," he said. "Which is still the cheapest deal any government has ever been offered for the continued existence of the planet."
She looked at him for a long moment.
Then — "I need to be in the room when you say that exact sentence. I need to be physically present for it."
"You'll be on my back."
"Obviously," she said, like that was never in question.
She leaned into his side and he put his arm around her and they sat with the map on the screen and the city outside doing its ordinary Tuesday thing entirely unaware that the person who was going to save it was currently working out the pricing structure for doing so.
The money wasn't the real reason though. It wasn't the main one. The main one was sitting against him right now with her sleeve-covered hand on his arm, six months old and still unknowable in the most fundamental sense. He'd been patient because patience was something he had in quantity. But patient didn't mean content. It meant waiting until the right move existed.
"That's not the only reason," Yuki said.
He looked at her.
"The archive," she said.
"Yes."
"That's the other reason."
"Someone built the game," he said. "Built it around something that existed before it, and that something is you, and the files are encrypted and I've gotten through everything I can get through alone." He paused. "The government has been hunting the developers since day one. If I work with them I get access to everything they've found."
"And if they haven't found anything."
"Then I have five hundred million per gate to keep looking."
She stared at him. Then she laughed — short, genuine, the kind that surprised her. She pressed her hand over her mouth and looked at him with bright eyes. "You're so—" she stopped.
"What."
"Nothing," she said. "You're just very you."
He looked at her. She looked back at him, still smiling, ears a little pink for no particular reason he could identify.
She kissed him. Not quickly — deliberate, her hand on his jaw, the kind that meant something specific and wasn't trying to hide it. He kissed her back and his hand found her face the way it always did and for a moment the map and the numbers and the red dots were somewhere very far away.
When she pulled back she stayed close, forehead near his shoulder, eyes on the screen.
"I'm there when you reveal yourself," she said. "I'm with you."
"I know."
"They're going to ask about me."
"A lot of things."
"We're not answering them."
"Not until we have answers ourselves," he said.
She nodded once. Final. Then she looked at the red on the map and back at him and something in her expression was doing the layered thing it did sometimes — warm and not quite nameable yet, getting less nameless every day.
"Okay," she said. Very quietly.
He picked up his phone and texted a number that had been trying to reach him for four months.
Set up a meeting. Come alone.
His phone started vibrating before he'd even put it down. He looked at the screen. Four messages in eight seconds.
Yuki felt the buzzing and looked up. "Fast."
"Four months of waiting," he said.
She looked at the screen. Looked at him. "Are you nervous."
"No."
"You're about to tell the entire country who you are and ask for five hundred million per gate."
"Per gate," he confirmed.
"For a planet-ending monster."
"For a planet-ending monster," he agreed, entirely calm.
She looked at him for a long moment with the expression of someone who found something genuinely admirable about this and wasn't going to say it out loud because that would only make him worse.
"Two weeks?" she said.
"Two weeks."
She tucked herself back under his arm and looked at the map. The red. The yellow. The strange quiet gap in the middle where the 20-to-30 floors sat exempt from rules that should have applied to them, still unexplained, still just sitting there being an unanswered question in a long list of unanswered questions.
He'd figured out every floor in that game alone over years. He'd done it without anyone waiting and without any reason except that the game was the only place he'd ever felt like himself.
He had a reason now.
She was 5'2" and insisted she was 5'3" and had called him her brother in front of thirty people on a crowded pavement and somehow that was the thing that had made him decide to tell the whole country his name.
He replied to the fourth message with a time and a location.
Then he put his phone down and didn't touch it again because Yuki had found his hand in his jacket pocket the way she always did and he wasn't going to do anything about that.
Some things were very simple.
End of Chapter 18.