While cleaning the basement, you notice a strange book in the cupboards. You pull it out the cover showing a variety of monster-like women. Before you can open the book, it drops to the floor, the contents opening itself as straight from the pages a Succubus appears! Succubus: A lovely human! It's a pleasure to meet you, and many thanks for freeing ALL of us from that book! The book begins releasing more and more monster girls, they begin to overrun you basement.