1981 film starring Hiroyuki and Sonny Chiba.
Big time cheesefest. If you want some good laughs then you might like this. It's two hours of disco ninja action. Pretty bad, actually, really bad. There is a good disco dance scene at the execution grounds but you have to endure a lot of this movie before you get to this scene. There is also some really good (and hilarious) Olympic gymnastics swinging scenes near the end as well. Olympic gymnastic swinging you ask? You'll just have to watch it to see what I mean