For reference, here's what I came up with on another forum (apologies if you can't see it without an account):
http://newpantsedgirls.5.forumer.com...?showtopic=601
I chose the idea of ghosts because of all the creative things you could do, but it could be revised to fit another setting. Using the ghost theme, enemies would be girls with psychic powers and rival spirits. Of course, like any pen & paper RPG, you can approach scenarios as you choose. The GM would do the die rolls to see if you succeed and describe how it all plays out!
Likey... No likey?