They emerged from the center of the second shadow.
This time, eyes open, Koyoi watched color bleed back into the world outside the window. Gray peeled away from the edges, exposing the hues beneath like old wallpaper being stripped to reveal the world as it once was.
"Did you know?" Asahi asked.
"Know what?"
"That the gray... it’s just paint over everything else."
Koyoi didn’t answer. It wasn’t that he knew; he had simply seen it.
The first time, he saw only gray. The second, he noticed the color waiting beneath. Even when passing through the same place twice, what one sees can change.
Kuon had the catalog spread open. Its pages were failing. The characters’ outlines were blurring more than before, and fewer passages surfaced even under the blue light of his eye.
"The copy is degrading," Kuon said, irritation edging his voice. "Every crossing through a shadow's center taints the catalog's information. This second time, the gray has cut deeper."
"Can’t you fix it?"
"It’s a duplicate. Not the original. The master is in the Archive. A copy cannot repair itself."
Koyoi looked at Kuon’s hands. The page corners had turned gray—a change that hadn't been there before.
"How many more times can we pass through?"
Kuon didn’t answer. Instead, he closed the book and ran a hand over the cover. The light in his artificial eye dimmed.
"I will read what I can, while I still can."
He said nothing more before reopening the pages. He increased his eye's output, forcing the blue light to resist sinking into the gray paper. Sweat beaded on his forehead.
Station lights flickered in the window. Starfall Town.
A single lantern flame bobbed at the bottom of the fog. It hung lower than before. It wasn't that the fog had grown thicker; the light itself had sunk.
Asahi stood up. "Let's go."
The train halted. The doors opened, letting in the fog and a biting chill. Koyoi pressed the pouch to his chest. The Droplet’s pulse was steady, but the fabric was taking on a faint gray tinge. Each crossing stained the cloth with ash.
The three of them stepped onto the platform.
The cobblestones were damp. Though the station was the same, the air felt different. It wasn't moisture; it was the weight of something stagnant, something that had settled.
Koyoi felt a gaze from deep within the haze. He stopped.
"...Someone is there."
The weight of the gaze intensified the moment he spoke. Whatever stared back through the white was not human. Nor had it ever been.
Kuon flipped through the gray-corrupted pages, casting blue light on a barely legible line.
"The Ghost of the Observer. That is how the records describe this station."
Asahi's hand brushed his hilt. "A ghost is the remains of someone dead, right?"
"No," Kuon said, finger pinned to the page. "It isn’t a human ghost. It’s the ghost of the act of observation itself. The records were frozen and the names bleached. This ghost is the echo of that work—a residue that remains after devouring the ones who did it."
"The system ate its own masters."
"Precisely. The Observers managed names through the system, but the system reached completion first. A finished system needs no handler. Those redundant traces... that is what lingers in the fog."
Koyoi gripped his pouch. Through the cloth, the Droplet felt cold—as if its heat were being sucked away.
But the pulse continued. Faint, yet sure.
"The Droplet is cold. But it’s still moving."
Kuon closed the catalog. "The Ghost doesn't attack. It simply rots information by its mere presence. It is the residue of a power that observes forever. The more you look, the more our own records will degrade."
"So, don't look."
"Avoid its gaze. Watch your feet."
Asahi stepped forward, hand on his hilt. He didn't draw; a blade could not touch a ghost. He simply used his body to shield the others' view.
They began to walk across the stones.
Gray grains fell through the fog like snow, yet they weren't cold and had no mass. They vanished on contact, leaving only a faded patch of color where they touched.
The ash of the Ghost. The residue of bleached names accumulated on the town like snow.
Koyoi watched his feet, counting the seams between the stones. Every grain of ash that touched his shoulder made the pulse in the pouch skip a single beat.
But it didn't stop.
Only the sound of their footsteps echoed softly at the bottom of the fog.