In a peaceful Japanese village named Aoku, a blind seamstress named Yumiko was secretly a centuries-old fox spirit. Only a half-Valkyrie could perceive her true identity. The village lived in harmony near the great northern forest until it changed, becoming bitterly cold. From the forest emerged fierce wolves, and the once-tranquil place turned fearful. Unbeknownst to the villagers, Yumiko, the seemingly harmless seamstress, revealed her true power at the age of 537. She prefers staying quiet.