When Brian was young, his father was murdered by a group of 
motorcycle drivers. Brian would have been killed too if it were 
not for a policeman named Tyler who saved him. Brian soon became 
a ninja and naturally sought to avenge his father's death. 
Brian's boss is Lucifer, the boss of the black ninjas, who was 
student with Brian under the same master. Lucifer said that he 
would fight the mafia, but was secretly dealt in prostitution, 
gambling, and drugs. As a ninja Brian has the difficulty of not 
being able to hide his emotions. When Lucifer asks Brian to kill 
some good people and he refuses, Lucifer becomes angry. Lucifer 
then asks Brian to kill Tyler, the policeman who saved his life, 
and of course Brian refuses. Brian's girlfriend is then killed at 
the command of Lucifer. Brian flees to his Master, who can help 
him defeat Lucifer. Brian gains the help of Eddie, who agrees to 
help Brian and his fight against Lucifer and his black ninja 
clan. What Brian does not know is that Eddie is an undercover 
policeman, and Tyler's brother. Brian's Master is suddenly killed 
in a surprise attack by Lucifer. Now it is up to Brian to avenge 
both his father and his master. Brian attacks the black ninjas 
with fury, killing all of them, and finally, killing Lucifer.

Source: Jasko