The Heike, also referred to as the Taira clan, hold considerable influence over Japan. A young girl who possesses a unique eye capable of foreseeing the future unintentionally offends the clan, leading to her father's death as punishment. Later, she meets Taira no Shigemori, the eldest son of the Heike leader, and adopts the name "Biwa." Biwa warns Shigemori about the Heike's impending downfall. After learning of the injustice she endured because of the clan, Shigemori decides to protect her instead of eliminating her.
As military conflicts escalate, the Heike become entangled in a strategic power struggle, with a bloody war looming on the horizon. Shigemori, who can see the spirits of the dead, finds himself caught between fear and hope as he attempts to prevent his clan's collapse. Biwa, however, is reluctant to reveal more about the future and has difficulty adapting to her new life, experiencing both joy and sorrow during this critical period in Japanese history.