Hanabusa is a young headstrong girl living in the Heian capital within medieval Japan. But when her mother is slain by evil spirits, her life turns into one of vengeance as she sets out to hunt and destroy the spirits.
During Hanabusa's travels, she meets a white fox who turns out to be a servant of the mountain god. Hanabusa receives a special sword passed down from her mother, which gives her the ability to see the true forms of spirits to help slay them. Shortly after, a spirit claiming to be Hanabusa's long-lost father, Hidetada, breaks her sword and leaves Hanabusa powerless and confused.