One winter, an ember-storm turned the sun a bruise. Crops failed in Midori, ships foundered on sudden shoals, and Kurose's forges coughed smoke that tasted of ash. The Dawnwright prince, Hayato, sent emissaries braided with silk and urgency to the other realms—an offer of grain for iron, of lanterns for lumber. The envoys returned with hollow bows and furtive glances: each realm had its own sudden scarcity, and none trusted the others enough to share.

When the island of Kyōsha split into three proud provinces—Akari on the eastern cliffs, Midori's endless forests, and Kurose's black-coal lowlands—the people called it Nippon Sangoku: the Three Realms. For generations, their borders were guarded by oaths and old songs. But oaths fray, and songs are fated to change.

At the basin's edge stood an ancient stone lantern, cracked but whole. On its base was a shallow basin where all three emblems fit like a trinity. When Aiko placed the rusted emblems together, the lantern exhaled. Not a light, but a warmth: a map of the island made of rising steam, showing underground aquifers, pockets of buried iron, routes where winds were kind and soils fertile. It also showed a hidden cache—old irrigation channels the ancients had built to feed all three realms.

The second trial tested craft: a crossing of broken iron bridges that could only be repaired by song and hammer. Rin's hands, used to shaping steel, laid new plates with Juro's moss-glue; sparks flew like tiny suns. The bridges held.

In the smoke, an elder monk named Sora—born of no realm, having walked the limits between them—said nothing of politics. He wandered to the ruined market square where children scavenged for warmth and found a strange thing half-buried: a broken lantern sealed with three emblems, one from each realm. Inside, wrapped in oilcloth, lay a map inked on skin, titled in a looping hand: "For the Lantern of Three Dawnings."