The Shirai ryu clan has been calm after the fights with the Lin kuei assassins, bit the demons of Japan with Muzan and his legion. Satoshi Hasashi was just living with his family when the demons attacked, both mother and father butchered and Muzan laying the finishing blow on Satoshi. However, the dead don't stay dead forever as his soul burned for vengeance against Muzan and his demon scum he must find help to do so as the burning shinobi SCORPION.
4 parts