Completely silly of course but a likable tale of three schoolgirls, an older sister and some ancient tale of revenge to be spun out with the use of 'tits and tentacles'.
You can't show a penis or even pubic hair but a six foot long knobbly phallic that spurts and oozes sticky stuff is just the thing for slithering in and out of schoolgirls' orifices!!
It's a bit low budget and the story is limp but the girl's fighting costumes (when they manage to keep them on) are nicely fetishist and who can complain about all that bare flesh, even if it is invaded by those gross 'Alien' inspired slitherers.