Miharu Rokujo was content to live life without caring about anything, but unfortunately, his destiny has other plans.  The secret art known as Shinra Banshou, with the power to control the entire world, is hidden inside him, and every ninja is involved in the fight over it.  Against his will, Miharu is made to join his school's Nindo Club, a club that teaches the way of the ninja, in order to protect himself.  The club's advisor, Kumohira, promises that he will try to find a way to remove the secret art from Miharu's body, and protect him in the meantime.  When Raimei, a ninja from Tokyo, shows up, she suggests they take Miharu to the Fuuma Village to talk to their leader, who knows just about all there is to know about ninja arts.  She finally convinces Kumohira to let her take Miharu, and the three of them, plus the Nindo Club president, make their way to Fuuma Village in Kanagawa. When they arrive, they discover that the village has been attacked by the Iga Grey Wolves, a faction of Iga shinobi that will stop at nothing to get the secret art.  They are forced to fight when the Grey Wolves discover Miharu's presence, but when things get difficult, the surviving Grey Wolves retreat, having already accomplished their initial purpose.  The most deadly of the Grey Wolves stays to finish the job, but just as Miharu is agreeing to go with him in order to save the others, the leader of the Fuuma Clan arrives just in time to save the day.