this be a very famous ninja movie but it isn not a nice movie . if you want to see some ninja and some figure and want to know some thing about ninjas see this movie . this movie only for ninja fan and who want to make nostalgia . first 20 minute and last 20 minute of the movie be best . you can just see ninja figure and fight in this scene . between these be below the average and nearly bad a a movie . acting be bad . sho ( black ninja ) be the best actor in this movie . frank nero be a good actor and charismatic but he can not fight good . scenario be also not good . it so simple . franko nero come near to his best and old friend from army and war . he also protect him from mafia but he be have sex ( go to bed ) with his wife and his friend know this but do not say anything to nero negative . be this possible in life . what a friendship . finally this movie start a genre while ninja movie . also there be the ninja master sho kasugi but some fighting scene be not realistic and not fast even with shoo . this film be below the average even it be a classic .