Ninja... Ninja were... merciless demi-gods, ruling Japan with their karate in the age of ninja tranquility. But, "some" committed a forbidden form of harakiri, storing their souls at Kinkaku Temple for future resurrection. Their lost history was falsified and concealed, and the truth about these ninja was long forgotten. Now, in a future where the universalization of cybernetic technology and electronic networks is God, sinister ninja souls resurrected from thousands of years past are suddenly unleashed upon the dark shadows of Neo-Saitama. Fujikido Kenji is a salaryman whose wife and child were killed in a ninja turf war. In a brush with his own death, Fujikido is possessed by an enigmatic ninja soul. Fujikido cheats death and becomes Ninja Slayer—a Grim Reaper destined to kill evil ninja, committed to a personal war of vengeance. Set in the dystopian underworld of Neo-Saitama, Ninja Slayer takes on Soukai Syndicate ninjas in mortal combat.