Joe Higan is a Nukenin – a former ninja who fled his clan and hid from his violent past in rural America with his family. One night, he is ambushed by a team of assassins from his previous organization who exact bloody vengeance on Joe and his family for betraying their ancient code. Rising from his "death", Joe will reappear as his old self – Ninja Kamui – to avenge his family and friends. Kamui is a 21st century ninja, a shadowy anachronism who pits his ancient skills against high-tech weaponry with brutal finesse. He must face trained assassins, fight cyborgs, and rival ninjas to bring down the clan that formed him.