Come on now...
What is Walpurgisnacht in this universe and what relevance does it have to the characters and the story, actually?
Walpurgisnacht is a huge witch fest with lots of booze and free sex. Hopefully it's like this in the anime.
You see, we all carry some white stuff inside us and we must fill the girls we love with it.
Nobody knows. I assume she referencing something like how it is in Faust.
White stuff a cute.