Former ninja Joe Higan is ambushed by assassins who seek bloody revenge on him and his family for their betrayal, after escaping his clan and fleeing into rural America.
Believing in humanity and order, policewoman Akane Tsunemori obeys the ruling, computerized, precognitive Sibyl System. But when she faces a criminal mastermind who can elude this perfect system, she questions both Sibyl and herself.