Hakuo Gakuin used to be a prestigious high school, and famous for martial arts. However, because its rival school; Seishikan, has been cowardly luring it's superior students, Hakuo was going to decline. 
In order to recover from the situation, the acting principal of Hakuo; Hojo Himeko, sends Yagyu Ranko to the Fuma Village in search of the famous Fuma ninja clan for assistance. The leader of the Fuma sent Kojiro to Hakuo, there he faces the notorious Yasha clan who fights for Seishikan lead by Asuka Musashi. 
Soon Kojiro's comrades arrive and an all-out ninja war postponed for 500 years begins between the 2 clans. (Source: d-addicts)

Hakuo Academy used to be a prestigious high school, and famous for martial arts. However, because the rival school, Seishikan, lured superior students by dirty way, Hakuo Academy was going to decline. 
In order to recover from the situation, Hokujo Hikoko, the chairperson of the boards of the director, sent a massager to the Fuma Village. Fuma Clan was a ninja group, and it was said that they could run several thousands miles a day, they could hear a needle drop three miles away, and they could tell apart one&rsquo;s face a mile away in darkness, etc. 
The leader of Fuma sent Kojiro to the academy. What was waiting for him at school was fight against Yasha Clan that worked for Seishikan and the strongest enemy Asuka Musashi. Musashi was fighting for a little sister who was suffering from incurable disease. 
(Source: AnimeNfo)

After the Chaos war, Kojiro and Ryuma return to earth only to find their clan members killing off each other.

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.
 
(Source: Anime News Network)

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