Starts off with a soft-core ninja training sequence that includes barely clad girls: mud wrestling, being dipped into ice water, having their bodies forced into contortions and learning the arts of seduction. Meanwhile an unscrupulous businessman who is hated by everyone, including his angry drunken wife and his hot-headed fight expert sister in-law, is being targeted by killer ninjas. The police are having no luck at catching the clever, secretive ninjas and ask for help from a Kendo teacher who gets romantically involved with the sister-in-law. Lots of great fight scenes including the end fight between the ninja leader (Yasuaki Kurata) and the Kendo teacher (Chen Kuan Tai). Some of the laughs come from: the use of cheap camera tricks showing the quickness of the ninjas, the female ninjas using their naked breasts to `relax' their foe and the ridiculous ghoul-face deaths induced by the poison the ninjas use to kill their victims.