As the English title suggests this is a movie about a girls' swim team fighting undead zombies. The zombies are the result of a plague that has taken over a school, but one which the girls' swim team is somehow immune to as the result of spending a lot of time in a chlorinated pool. It also helps that the new girl and latest swim-team member is an orphan who has been trained as a spy and a martial arts expert (at least when her horny sensei/mad scientist wasn't busy playing the flute or having boob-bouncing sex with her).
I'm actually not a fan of modern-day sex films because they just have too much sex in them. I'm also not fan of modern-day zombie films because there are just too damn many of them. Both "genres" today are more often than not shot on digital video, which doesn't always look bad, but has one very major drawback--any idiot can do it (and it's usually idiots that DO do it). This SOV zombie-sex movie seemingly has three strikes against it from the get-go, but it's not THAT bad. First off, the sex and zombie elements may not entirely work together, but the gory zombie stuff does serve to make this less boring than your typical straight sex movie, and all the naked and nubile Japanese girls do serve to make this more enjoyable than your usual inept SOV zombie movie. I think low-budget American filmmakers (or, um, video-makers) are actually beginning to catch on to this Japanese extreme sex-and-violence hybrid formula with recent movies like "Bad Biology" and "Black Devil Doll".
This movie also has a few funny sequences like the zombified math teacher who babbles some word problem about apples and then cuts off the head of a student with a samurai sword when he doesn't like her answer. And the girls are all very cute and they spend most of the movie dressed in butt-hugging one-piece swimsuits (when they're not actually naked, that is). This okay I guess.