I saw this years ago at the pictures. The film is basically about a Japanese guy(cho) who's family is practically all killed off and moves to America selling imported Japanese dolls.Unfortunatly his business partner)raiden) is a rather bad guy who uses the business as a drug smuggeling front tied up with the mob. Theres a lot of double crossing etc that goes on and we finally learn that Raiden has also been taught the ninja arts. The films climaxes with a major battle on the roof of a sky scraper. Funny enough the film is rather good and it has also been well researched.Everything from the koga family crest of the swan, the pyro arts, knot and rope tying , body angling and body movement to the use of the sword adds up.The little Kane kosugi is spot on with his sword and reflects the training as a child that traditionally ninja went through, well perhaps not quite in the same way. Yes we can see the fight scenes are acted out but sword work and postures add up. I heard that sho kosugi was taught by his grandfather. His movement is not random there is a system in there. Well done Kosugi san definatly your best film. Great film and was so nice to see again as an adult. If you like ninja films this is definatly one of the better ones.It is also set in the modern day America.