We don't stay in the kissaten.
Rei makes the decision before I do, standing and leaving two thousand yen on the counter with the practiced efficiency of someone who has been conducting unofficial meetings in public spaces long enough to have the exit choreography memorized. I follow her out into the Kagurazaka side street and she walks without looking back and I match her pace and we don't speak until we've put two corners between us and Hoshino.
She stops in a service alley between a florist and a closed gallery. Narrow, anonymous, the kind of urban gap that exists in every city as accidental privacy.
"Minami was watching you in Kōenji," she says. "Which means they followed you from the courthouse or they were already in position near the bookshop."
"Or they had remote access to the phone Tada returned."
She looks at me. "You think Tada gave you a compromised phone."
"I think Tada made a decision this morning that deviated from his instructions and I don't fully understand why." I turn the phone over in my hand. "If Ryūsei wanted to track the drive, returning the phone with access already installed is cleaner than following me through three wards on foot."
Rei is quiet for a moment. The florist on the other side of the wall is receiving a delivery, the sound of plastic wrapping and someone counting stems. Ordinary morning, ordinary commerce.
"Give me the phone," she says.
I hand it to her. She turns it over, examines the edges, the ports, the seam where the case meets the body. Then she does something precise with her thumbnail at the corner of the screen, a pressure point I wouldn't have known to find, and the back panel releases slightly.
She looks at the interior for three seconds.
"Aftermarket component," she says. "Small. Passive transmission, activated by the phone's own signal." She snaps the panel back. "It's not recording. It's location only."
"So Minami didn't need remote access. They just followed the signal."
"Tada gave you a tracked phone." She hands it back. "The question is whether he did it on Tomura's instruction or his own."
I think about Tada in the bookshop doorway. The assessment behind the friendly expression. The decision he made that his principal hadn't authorized. He left without the drive, which was the deviation. But he returned the phone, which was the mechanism.
"Both," I say. "Tomura told him to return the phone if he couldn't retrieve the drive. Keep the asset trackable. Tada made the call to leave without the drive and used the phone to cover his deviation. As far as Tomura knows, he's still running the location."
"And Minami is also running the location," Rei says. "Which means Minami and Tomura are currently looking at the same signal."
"Minami got here first."
She looks at the phone. "We need to move the signal and leave it somewhere static. A train station, a convenience store, somewhere with enough ambient movement to create noise." She pauses. "Then we go somewhere clean."
I look at the waterproof bag. "I need to open the documents before tonight. Before we meet Minami." I pause. "There's something in the bag I haven't looked at yet. Physical documents, not just the drive."
Rei looks at the bag. She looks at it the way she looked at Minami's name on the phone screen, with the careful stillness of someone preparing for information that will require a response she hasn't planned yet.
"All right," she says.
We leave the phone in a konbini two streets away, tucked behind a row of magazines on the bottom shelf where it will sit broadcasting to both Tomura and Minami while we go north. Rei has a second car, not the dark blue sedan, a rental paid in cash that she apparently organized before leaving the precinct. She takes me to a room above a dry cleaner in Bunkyō ward, the kind of space that isn't safe-house official but functions as one, accessed through a side door with a key she keeps on a ring separate from everything else she carries.
The room is small and clean and contains a table, two chairs, a window that looks at a wall, and nothing personal. It smells like someone else's careful absence.
We sit at the table.
I open the waterproof bag.
The hard drive goes to one side. The burner phone, dead, no charger. I set it aside. The documents are folded together, sealed inside a secondary sleeve of waterproof plastic, three sheets of paper that have been handled enough to show it at the creases.
The first sheet is a list of names and dates. Formatted precisely, the handwriting small and controlled. Twelve names, twelve dates spanning eight years, twelve amounts in yen with a column for project designation. I don't recognize the names but the project designations repeat in a pattern that maps to the Hakurei contract structure Rei described in the Kōtō ward alley.
"Payments," Rei says, reading beside me. "To individuals, not companies. These are people, not entities." She points to the third column. "Project designations match the municipal contracts. These are the human recipients of the contract payments. The people Tomura was routing money to through Hakurei."
"The financial layer Mizore couldn't complete," I say.
"She had the company structure. She needed the human names." Rei looks at the list. "Saitō had the names."
The second sheet is a diagram. Hand-drawn, precise in the way of someone who thinks structurally. Boxes and lines, hierarchical, the kind of organizational chart you draw when you need to see the shape of something in order to understand it. At the top, a box with no name. Three lines descending from it to three named boxes, one of which is Tomura. The other two names I don't recognize. Below Tomura, a line descending to Hakurei. Below the unnamed box at the top, a separate line descending to a box labeled Ryūsei with a question mark beside it.
The question mark beside Ryūsei.
"Saitō wasn't sure Ryūsei was the origin," I say. "He thought it might be a layer. Something above it."
Rei looks at the diagram without speaking.
"The unnamed box at the top," I continue. "He didn't know who it was. Or he knew and chose not to write it."
"Or he knew and it's the name Minami said we're not ready for," she says quietly.
We sit with that for a moment.
The third sheet is different from the first two.
The first two are documentation. Precise, formatted, the work of someone compiling evidence with the systematic care of a person who knows the evidence needs to be usable. The third sheet is handwriting that doesn't match. Looser, less controlled, written faster and under different conditions. Written, I think, more recently than the others. Written, I think, the night everything went wrong or close to it.
It begins without a salutation. No name. No to or from.
I read it.
If you're reading this then either I'm dead or something happened that I didn't predict, which amounts to the same thing in terms of what you need to know.
I spent four years inside Ryūsei. I spent the four years after that believing that leaving was enough. That the distance I put between myself and what I did there would eventually become the thing itself, the way scar tissue becomes skin.
It doesn't work that way. I know that now.
Mizore came to me six weeks ago. She knew what I knew and she needed confirmation for what she couldn't prove. I gave her what I could. Not everything. I told myself it was protection, that holding the rest back kept her safer. I know now it wasn't protection. It was the last thing I had that was mine and I wasn't ready to give it away.
The name at the top of the diagram isn't someone in Ryūsei.
It isn't someone in the Metropolitan Police.
It's someone I trusted before I trusted anyone, before any of this, before I understood what trusting people costs.
I don't know how to write that name here. Not because I'm afraid of it. Because writing it makes it the kind of real that I haven't let it be for three years.
If Rei reads this, I need her to know that I knew about the investigation before she started it. I knew she was working with Mizore. I let it happen because it was the only way I could be near something true without being in it. That was cowardice. I know that.
I'm sorry for the specific shape of it.
The name is in the drive. Sector three, encrypted, the key is the date my mother's shop opened. I didn't put it in the documents because documents can be found. Some things need a door.
Do what I couldn't.
It isn't signed.
I read it once and then I read it again and then I put it flat on the table and I look at it and I don't look at Rei.
She reads it beside me. I know when she reaches the paragraph about herself because her breathing changes, barely, the kind of change that only registers if you're already paying the wrong kind of attention.
She doesn't speak for a long time.
When she does, her voice is level. Professionally level, the kind of level that costs something to maintain.
"He knew," she says.
"Yes."
"The whole time. He knew I was working with Mizore and he didn't warn me." A pause. "He didn't warn her."
"He thought the distance protected you."
"He thought wrong." She stands. Moves to the window. Looks at the wall outside and the narrow strip of gray sky above it. "He thought wrong and Mizore is dead."
I don't say anything. There's nothing to say that the silence isn't already saying more precisely.
After a moment she turns back. Her expression has done something I recognize from the courthouse steps this morning, from the alley in Kōtō ward, from the kissaten counter. It has closed over something and continued.
"The encryption key," she says. "His mother's shop opening date."
"We need a laptop and a way into the drive."
"Nishida has both." She picks up her keys. "And we need to do it before tonight." She looks at the letter on the table. "Because if the name at the top of that diagram is who Saitō couldn't write down, and Minami knows it, then the meeting tonight isn't just an exchange of information."
I look at her.
"It's Minami deciding," she says, "whether we're ready to survive knowing it."