Killer vagina tentacles, babies transferring from one womb to another, pools of semen, and magical bubble blowing vaginas. It sounds great on paper, but in reality it's an incoherent mess that just seems to be making it all up as it goes along. Scenes randomly transition from one WTF moment to another, without a sense of purpose or making a whole lot of sense.
The movie probably makes slightly more sense to viewers well versed in ninja legend and lore (ie Hattori Hanzo, Kotaro Fuma), which I am not, but I'm confident no amount of historical knowledge or background will explain the pussy molding masks and instant births spawning full grown children.
Still, the movie is entertaining enough, if only to see what crazy thing is going to happen next. And all these crazy scenes are accompanied by detailed, squishy foley effects. This is definitely not the place to start with pinky/japanese sexploitation. But it is a ride.