Chapter 5: Micro-Cache / Payment

Kei pins a square of acetate over the taped map and draws two quiet lines.

“The window starts in thirty-six hours,” he says. “Nullists are trying to ride public grid. If they fail, it collapses to district scale, but the aperture timing stays. Here.” He taps three intersections: relay spines and drainage conduits that hate each other on paper and cooperate in practice. “You’ll want to be nowhere near these when the Hymn gets friendly.”

Friendly. The word sits wrong and true at the same time.

Usagi studies the lines with her head tilted, like listening to a bird: curious, careful, not pretending to know the song yet. Kei hands her a wax pencil.

“Trace your exit,” he says. “If you can draw it, you can walk it.”

Usagi chews her lip and sketches the thread they came by, then a new one that skirts the marked aperture—down a service run, across a mesh bridge, past a lift pit. Semireiya watches the small corrections: one corner eased, one bend widened. No bravado. Just clean.

Kei nods. “Good.”

He sets the reader between them. The ENVY spool they paid sits as a thin green thorn on the screen; the two Hymn slices lie beside it—the first glass-bright, the second velvet-rounded. He flicks to a diagnostic without touching the thorn, then to a blank window that asks for a file it already knows he wants.

“Anything else?” he asks.

Semireiya lifts her band, thumb on the wheel. “You said the wall pricked.”

“Edge of the seam,” he says. “It came with your knock.”

Usagi’s fingers find the table’s underside and hold it there. Semireiya stands, and the room’s light presses warm onto her wrists. The concrete seam at the door looks like every seam ever poured, which is to say: it looks the same and also like this one. She presses the band to it and rolls the wheel two clicks—passive only, no handshake.

A small, precise ache opens behind her right eye, the kind that means a signal is trying not to be a voice. The band grows warm, then remains what it is. A single pulse arrives—not a tone, not a word; a weightless push, like a hand against glass.

“ソラニ…?”Sorani…?

The ache sharpens, then thins. On the band’s bevel, a coordinate delta prints itself as if it always lived there: one number family off from the cache’s own center, repeating once as if embarrassed to repeat again. The hash under it scratches a signature that has nothing to do with Pact or Nullists or the city—just a small, old check mark she has seen in debug notes too many times.

The room holds its breath. Semireiya takes her hand from the wall and lets the band be a band again. The ache backs away like a well-trained dog.

Kei doesn’t reach for her. He doesn’t look surprised. He only turns the reader back toward them and slides a palm-sized mylar envelope across the table.

“Swab?” he asks.

Semireiya drops the delta into the envelope and seals it with a press that feels like lying to herself in a useful way. Kei files it under the table’s lip without letting it leave the light. The reader’s strip printer makes a skinny, satisfied sound and spits out confirmation: /ROOT EDGE: DELTA (1). He doesn’t read it out. He doesn’t need to.

Usagi exhales and only then lets her fingers unclench.

Kei pours water into three chipped mugs and sets them down like a contract. “Two things before you go.”

Semireiya wraps both hands around the mug. The ceramic’s warmth tells an ordinary truth she wants to keep.

“One,” Kei says, tapping the left Hymn slice. “Variant’s ‘sweet’ partial is algorithmically dynamic. It learns in short cycles. Your slices prove they’re testing politeness curves to bait attention. If you hear something nice, add distance before you add trust.”

Usagi nods sharply, jaw set. “わかった。”Got it.

“Two,” Kei continues, “your uplink logs flagged an anomalous side-channel—a side-channel slid ‘left in a tone that wanted to be family.” His eyes rest on Semireiya without prying. “Voice-forgery’s improving faster than rumor says. Expect it again.”

Semireiya doesn’t answer out loud. She files the warning where she puts knives.

Kei caps his pen and circles a smaller path overlapping Usagi’s pencil line. “Here’s your lease—ten minutes of bent attention; the city looks the other way—starting when I light the east duct. You’ll exit to a lamp-tight culvert, skirt the spillway, then ground level through a broken fan gate. Avoid the grid edges—Loop Trap prep will make them feel safe.”

He tears the acetate corner and hands it to Usagi. “Receipt for the lease. Doesn’t spend, just reminds.”

Usagi folds the corner like a tiny flag and slips it under her band.

Semireiya stands. Her legs resolve the last of the Seraph ghosting into an ordinary steadiness. The thin ring in her ear has become only the room’s fan.

“Price?” she asks.

Kei tilts his head at the reader, then at the mylar envelope hidden in plain sight. “Paid.”