Eliza Constanze is an operative of a mysterious, worldwide association dedicated to mysterious cold cases. However, she uses her job as a springboard for her real goal, the eradication of demons. This habit often results in her having to juggle it along with her job, as the more she fulfills her demon hunting, the more her reputation goes down due to her assigned cases becoming unsolvable. She often doesn't do well with this pressure, which fuels her dependence on ciggarets, alcohol and coffee..