Prequel to Fuuma no Kojirou. All three chapters were compiled at the start of the first volume of Akita Shoten's "Definitive Edition" re-release of the original manga in November 2019.

Hakuo Gakuin has hired the Fuma ninja clan to protect them from rival school Seishikan, who has been injuring all studetns who refuse to transfer. This is just the start of the Fuma's adventure as they fight one last battle against their rival clan the Yasha, become involved in a war based around the 10 Sacred Swords, and fight against a rebellion within their own clan.
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(Source: Anime News Network)

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