Hakuo Gakuin was once a prestigious high school renowned for its martial arts program. However, its rival school, Seishikan, had been cowardly luring its superior students, prompting Hakuo to consider withdrawing. To recover, the acting principal Hojo Himeko sends Yagyu Ranko to the Fuma Village in search of the famed Fuma ninja clan for assistance. The Fuma leader dispatches Kojiro to Hakuo, where he confronts the notorious Yasha clan that fights for Seishikan under Asuka Musashi. Soon Kojiro’s comrades arrive, and an all‑out ninja war, delayed for 500 years, erupts between the two clans.