So basically it's a test of will and luck. If you pass you get a cute girl who always teases and will promise you happiness all your life. If you fail you end up a monster in constant orgies and losing yourself.
I like this entry, though I may or may not fail myself
we have the wererabbit in the profiles that came after that rabbit from the wonderland. well maybe they live normally in wonderland but sometimes they leave it to search for a man and if they get one they will not return. profiles say not really that is a law to get back to the place with where the monstergirl came from after she gets a man.
Wererabbit = White Rabbit. It's pretty obvious, white fur, and the large watch she wears in the profile... In addition, the extended profile published at Comiket (MGE-1 Collection), added a line about them guiding people to Wonderland, and being able to identify things that came from there. The Alice's extended profile meanwhile mentions playing with Wererabbits.
I'm not fond of most of these more recent creations, as this whole project has taken a turn for the more mindless sex-fiend creatures, but I've always liked the Cheshire Cat as a character, and tricksters in general. I could go for grinbitch the wife.