We're into Spooooky Season with creepy... not ghosts, but like demons! Demonettes! Legally distinct and unique conceptually from another company's big giant TM that honestly I don't think holds up in any reasonable court, but these aren't reasonable times!
This is one of those "What is gender, really?" comics. So like, if you're not into parts going all over the place and boundaries getting pushed and pulled, this is not your jam! But then again, maybe that's what makes it spooky? Scary? Horrifying? Like surely none of you would want weird demon girls to come up and turn you into a girl as well.
Anyways the ritual described in this comic is towards the back of the Solomon texts, you'll just have to do your own research from there. And do it well, because as described, these girls are sticklers for things being done to the letter of the contract.