As someone who's seen La Blue Girl (well, 2 episodes)....
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It's just flat-out looney. Okay, so you got this girl who's part of an ancient clan of sex ninjas. Yes, sex ninjas. All their martial arts are sex based. They can kill people with orgasms, control their mind by plopping in some semen. That kind of crap. They work with these sex demons from a paralell dimension, although at one part the sex demons get out of control cause their king is imprisioned.
The plot is actually too complex for me to explain with the limited episodes I've seen. It's amazing the (comparative) effort the Japanese put into their porno plots.
-Mr Fluffypants
I have seen a 3d Porn, and 'lo, it was frightening.