In ancient gems lie the spirits of failed heroes from China's Three Kingdoms era, scattered across Japan. Possessing immense potential, these jewels transform their inheritors, dubbed Toushi, into battle-hungry warriors. Among them is Hakufu Sonsaku, residing in the countryside with unquenched thirst for combat until her mother pushes her to Tokyo. There, training alongside fellow Toushi, Hakufu embarks on a journey to fulfill her fateful calling.