The other review hit the major points. A screaming howler of a bad movie. The version I saw was subtitled in English. I really wished I knew Japanese because I'm sure plenty of "entertainment" was lost in translation.
I'm not a Ninja movie fan, and the fight sequences are poorly shot - edited - directed, so I found it funny that during fight sequences you just had to wait to the end to see who would loose body parts. The high pressure misting blood was classic! C'mon! The shear goofyness was bizarre! This was based on a story and I kept wondering who made more trips to the Opium Den? The original story writer, the one who adapted it to the screen, or the Director? In one scene a hero & heroine fall through a trap door into a slime pit rife with the remnants of others. As they think on how to escape our heroine mentions the hero will need a sharp blade upon their escape. Wouldn't you know a virgin's blood would be just the trick. Let the fornication begin! The nasty bad guy is appalled they would have the gall to have sex in his Pit O' Death and starts shooting arrows at the copulating couple. Our hero dances and parries about with his good woman still mounted. His sword slicing each arrow. Cut to an extreme close up of the shining blade deftly held for one drop of blood to sing the blade electric! Now that's "Bad Cinema" at it's best and there is plenty more.