two old buddy be send to japan to get back result of a genetic research contain videotape and which be steal by the black suited ninja at the beginning of the movie . first they just have to learn some ninja skill and because only ninja can beat the ninja . sakura killer try hard to be enjoyable ninja flick but fail that badly . the whole movie be just so hollow and predictable that be hard to say anything good about it represent same plot have be see in different variation dozen of time before and character be too briefly drawn and direction be dull and script doesn not offer anything surprising and even in the end scene and which by itself reduced movie ( trash ) value . even 80 ninja flick fan and who understand the esthetic of trash movie and be hard to find this movie even barely enjoyable . it simply doesn not offer anything new to viewer and neither in visual level nor in plot . shurikens be throw and katanas be swing and but it not enough to lead the movie direction it mean to be and recur similar fight scene numbs even the most calloused viewer after the first 30 minute . it hard to recommend movie to anyone . even franco nero clumsy performance in enter the ninja fall behind sakura killer american ninja . even in visual level movie doesn not have any ball and it waste of time to try to find any great fighting scene in this movie represent there isn not any . in all and one of the most futile ninja flick and i have ever see . doesn not interest even in curiosity . trust me on this one . ½ out of 10 .