The year is 1179. Saya is a twelve-year-old girl living in a small village, working for the village head after her mother's death. Since childhood she has possessed "Heaven's Eye" — the ability to see through any lie. One day a magnificent procession arrives, and a young man kneels before her: "I have come to retrieve you, M'lady." What follows is a journey into an entirely unfamiliar world, alongside an entourage led by Minamoto no Yoshitsune, as Japan moves toward the Genpei War.