Ninja clans battle in the shadows to claim a mystical power - the Shinrabansho - residing within Miharu. Whoever controls its strength will control the world.

Raimei thinks Miharu would benefit from training with a mysterious Fuma teacher. But when they arrive to meet him, something sinister seems to be afoot.

New enemies and amazing powers are unleashed as Miharu’s group battles an incredibly skilled band of ninjas bent on stealing the arcane secrets of the Fuma way.

Miharu questions his fate, and his friends and enemies set out on the same mission: gather the forbidden hijutsu of each ninja village.

With so many coveting the Shinrabansho, Miharu must face that everyone around him likely has ulterior motives - even Raimei, who wants to make her brother Raiko pay for his sins.

Yoite forces Miharu to make a life and death decision - and no matter his choice, the pain surrounding the battle for the Shinrabansho will multiply.