In a Japan dominated by the powerful Taira clan, a young girl possessing a unique gift of foresight commits a grave mistake that costs her father's life. Encountering Taira no Shigemori, the clan leader's son, she forewarns him of the impending downfall of the Heike. Touched by her tragic past with his family, Shigemori decides to protect her instead of allowing further harm. As political tensions escalate and warfare looms, Shigemori, gifted with the ability to perceive spirits, strives to alter the course of his clan's fate. Biwa, the mysterious girl, grapples with her newfound existence marked by joy and sorrow, shaping a crucial period in Japanese history.