Long ago, in a valley where a small village lay, two deities fought each other. One was imprisoned, the other vanished. Yet some time ago, an unnatural mist began lingering in the village, dissolving people’s memories.

Biyu, a young shrine maiden, is now working her hardest in the shrine of one of these deities in the faint hope the mist will one day dissolve. Even though her good friend also lost his memory, not all hope is lost; she meets a stranger who seems to be recovering from his memory loss, and rather quickly as well…