In the city of Yōsei-to, light travels through ancient copper veins.
Someone must guide it home before the darkness claims it whole.
Once, Yōsei-to blazed with ten thousand signals. Voices carried on tightly wound copper pathways across the city's six wards. Merchants sent orders. Families sent news. Lovers sent words they were too afraid to speak aloud. The relay nodes never slept. The keepers who tended them barely did either.
Then the Great Decay came — not with violence, but with silence. No one knows why. The signals simply grew faint, one by one, as if the city had slowly forgotten how to speak. The Routing Guild tried to stop it. They failed. The last of them, Master Iroh, spent his final years training a single apprentice before the darkness claimed him.
You are Sumi — his apprentice. Signal keeper. Last of the routing guild. You carry his tools, his notes, and three years of grief across the copper roads of a city that has forgotten the sound of its own voice.
Your work is simple, and impossible: route the signal home before it fades.