Sakuya stepped aside. Tucking his ticket punch back into his robes, he leaned against the corridor wall in silence. Mio retreated a step, as if seeking shelter in his shadow. The sharp, vermilion scent of the paper parcel began to fade.
The three of them moved deeper into the passage. Past the gangway connection, the floor beneath their feet changed.
From floorboards to stone. It was cold stone.
Through the soles of their feet, a rhythm separate from the train’s vibration pulsed upward. It was a slower beat, coming from somewhere far deeper. A subterranean heart.
At the end of the corridor was a hole. A perfect circle. It was roughly the size of a single tatami mat.
The rim was fashioned from polished stone. A warm wind blew upward from the bottom—not a gust of raw information, but a gentle, living breeze.
"A well."
Kuon turned his prosthetic eye toward it. The pale blue light was swallowed by the depths of the hole.
"Inside the train...?"
Asahi peered over the edge. Kuon flipped through the pages of his Catalog, his artificial eye deciphering the characters carved into the stone rim.
"A filtration device for Names, installed by the Observer," Kuon explained. "One drops a Name from above; only those that can withstand the wind reach the bottom. Those that cannot are scattered to the gale. It is a well built for winnowing."
Koyoi knelt at the edge of the well. The wind lifted his bangs.
The drawstring pouch at his side quivered. The Names within were responding to the updraft rising from the depths. They made no sound, yet they seemed to be communicating something through their pulsations alone. There is something we know inside this wind, they seemed to say.
Koyoi placed his hand on the stone rim. It was vibrating. The tremors were fine and regular, mimicking the beat of a heart.
But it wasn't just one. Multiple heartbeats were overlapping, traveling up from the depths to reach this spot.
"They're connected," Koyoi said, his words hitching on a breath. "Hoshino’s well and this one. Deep beneath the earth."
Kuon narrowed his prosthetic eye. As he spread the Catalog open, a thin golden line raced along the corner of the page. Between the fibers of the paper, the roots of the Names were beginning to permeate.
"The roots of these Names reach deeper and spread wider than we imagined," Kuon murmured. "To think they’ve reached even beneath the train."
The wind surged.
Golden particles drifted up from the bottom of the well, brushing against their cheeks. They weren't cold. They were warm—the body temperature of a Name. Asahi reached out, catching the particles in his palm.
"...They’re calling out. These things."
Koyoi pressed the pouch to his chest. The pulsing of the pouch and the heartbeat of the well were thrumming at the exact same tempo. Through the underground roots, the Names of the Twenty-two Pillars were reaching this very spot. This was why Sakuya’s ticket punch couldn't sever them.
A Name was no longer a single thread. It had become a web. Even if one part were cut, the pulse would simply find another path.
The wind from the well continued its steady, peaceful breath. The bottom remained invisible, yet the respiration of the Names dwelling there reached them clearly.
Koyoi didn't take his hand off the stone. He couldn't. The warmth traveled from his palm, up his arm, and seeped into the depths of his chest.
The Names weren't just calling out. They were showing the way.
The direction the roots grew. The intervals between the pulses. The strength of the heartbeats. It was all forming a map.
"We weren't the ones carrying the Names..." Koyoi whispered, his eyes fixed on the darkness of the well. "The Names are the ones showing us the way."
Kuon closed the Catalog. The golden line pulsed along the gutter of the pages.
"Twenty-two coordinates have cast their web," he said. "We are merely walking upon it."
Asahi closed his hand over the particles in his palm. Light spilled through the gaps between his fingers.
The wind blew. From the bottom. From the deep.
The train continued its journey, racing across the map the Names had made.