When a salaryman named Fujikido Kenji loses his wife and child to ninja violence, something supernatural intervenes. A mysterious ninja soul called Naraku—driven by an insatiable hunger for bloodshed—possesses him. What emerges from their fusion is Ninja Slayer, a relentless force of vengeance that hunts down other ninja with terrifying efficiency.
The partnership between Fujikido and Naraku is symbiotic and unstable. The more they sync mentally and physically, the stronger Ninja Slayer becomes. Fans often note that if Fujikido were to fully surrender control to Naraku, his karate abilities would reach near-invincible levels—though that kind of complete surrender would likely erase whatever humanity he has left. It's this tension between man and spirit that defines the character: raw power constantly threatening to consume the person wielding it.
Content compiled by AnimeList.moe from publicly available sources.
